CN115872570A - Shale oil and gas field produced water treatment method and combined device - Google Patents
Shale oil and gas field produced water treatment method and combined device Download PDFInfo
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- CN115872570A CN115872570A CN202310019189.8A CN202310019189A CN115872570A CN 115872570 A CN115872570 A CN 115872570A CN 202310019189 A CN202310019189 A CN 202310019189A CN 115872570 A CN115872570 A CN 115872570A
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Abstract
The invention discloses a shale oil and gas field produced water treatment method and a combined device, and relates to the technical field of oily sewage treatment. The method and the combined device for treating the produced water of the shale oil and gas field have the advantages of simple combined treatment process technology, practicability, multiple functions of selected devices, small size, convenient skid-mounting, full-closed treatment process, no volatilization of VOCs (volatile organic chemicals), no sludge falling to the ground, safe and environment-friendly operation, and the most prominent point of the method and the combined device is that the problem that the produced liquid of the shale oil and gas field is difficult to treat is solved, and the treated water quality reaches the standard.
Description
Technical Field
The invention relates to the technical field of oily sewage treatment, in particular to a method and a combined device for treating produced water of a shale oil and gas field.
Background
At present, the discovery of conventional oil fields is less and less, and in order to meet the requirement of human beings on petroleum, petroleum workers gradually shift to the pilot production development of shale oil and gas fields. Because shale oil and gas fields are deeply buried, rock stratums are compact and have poor permeability, development can be carried out after large-scale fracturing, fracturing fluid required for fracturing one shale well is generally more than 10 times of that of a conventional well, the oil field is called to require thousands of square sand square fluid, and the fracturing fluid of the actual shale well reaches more than one hundred thousand square. The discharge amount is very small when the large amount of liquid is discharged back, most fracturing fluid is taken out along with the trial oil extraction and gas extraction process, the ground surface of the produced fracturing fluid after gel breaking is oxidized into colloidal solution, great difficulty is brought to water treatment, and the existing oil field water treatment process cannot treat the fracturing fluid. In order to ensure normal operation of pilot production and development of the shale oil and gas field, the oil field is subjected to separate blending treatment by separately blending produced liquid of the shale oil and gas field into each treatment station by using a multi-choice truck-puller so as to reduce the proportion of fracturing fluid contained in sewage.
Disclosure of Invention
In order to solve the technical problems, the invention provides a shale oil and gas field produced water treatment method and a combined device, which are verified by field tests to realize the breakthrough of standard water quality after the produced liquid of the shale oil and gas field is treated.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for treating water produced by a shale oil and gas field, which comprises the following steps:
step 1, collecting waste gas and waste liquid of an oil field into a gas-liquid collecting tank through a liquid collecting pipeline, allowing gas separated by gravity in the gas-liquid collecting tank to enter a VOCs treatment device through an overflow port, and finishing treatment on volatile VOCs in the VOCs treatment device by using an electronic reduction method; the other function of the VOCs treatment device can also play a role of a breather valve, and the device can exhale and inhale during operation so as to ensure the pressure balance and safe operation in the gas-liquid collection tank; simultaneously:
step 2, pumping out the liquid in the gas-liquid collecting tank from the bottom sewage collecting tank in the gas-liquid collecting tank by a lifting pump, and adding a demulsifier into the liquid which passes through the liquid feeding device when the liquid passes through a liquid outlet pipeline of the lifting pump; then:
step 6, when the deoiled liquid is discharged through a water outlet pipe, adding a gelling agent, a flocculating agent, a coagulant aid and a settling accelerator into the liquid in the water outlet pipe through a dosing device, and then feeding the mixture tangentially into a vertical homogeneous pipeline mixer-2; then:
step 9, sequentially utilizing a vortex cylinder to complete vortex coagulation and centrifugal desilting of the liquid after dosing in a desilting device; utilizing the adsorption coalescence suspension ball to complete coalescence and desilting; utilizing a settling cylinder to finish gravity settling and desilting; simultaneously:
step 10, exhausting the sewage from the upper part of the sludge removal device into a gas-liquid collection tank; simultaneously:
step 11, discharging the mud discharged from the mud removing device into a mud concentration and solidification device; then:
step 12, bagging and transporting the dry mud after concentration and solidification by a mud concentration and solidification device, and allowing separated water to automatically flow into a gas-liquid collection tank; simultaneously:
step 15, the centrifugally separated vortex water is screwed out through an overflow port at the upper part and enters an electric-elimination cation processor for electronic treatment, and an electronic reduction method is utilized to finish one-time treatment of scale prevention, sterilization and corrosion inhibition; then:
step 16, turning the eddy water after the treatment of scale prevention, sterilization and corrosion inhibition by an electronic reduction method downwards to enter a rough filtering layer for rough filtering; then:
step 17, after coarse filtration, discharging water from the coarse water purification device, aerating the water on a water outlet pipe, and then feeding the water into a fine water purification device (9) for fine treatment; then:
step 19, the eddy current condensed water in the fine water purification device is redirected downwards to enter a fine filter material layer, and part of emulsified oil fine particles are intercepted by the fine filter material layer; then:
step 20, performing secondary treatment of breaking emulsified particles, preventing scale, sterilizing and inhibiting corrosion by an electron reduction method of an electric deionization cation processor on the finely filtered water; then:
step 21, the effluent treated by the fine purification water device enters the fine purification water device after being aerated again by the air-entrapping device in the effluent pipe, and then:
step 22, in the fine water purification device, water firstly enters a central fine turbulence generator from the top, and the fine turbulence generator is used for finishing jet negative pressure to remove trace oil of emulsified particles cracked by an electric deionization cation processor of the fine water purification device; the microparticles are precipitated into fine particles by vortex and re-coagulation of the circular tank; in separating out oil gas from the last sewer drain admission liquid collecting tank of device, simultaneously:
23, redirecting the eddy water subjected to oil removal by the fine turbulent air flotation and coagulation downwards to enter a fine filtering layer, and intercepting fine particles and fine oil droplets by a fine filtering material; then:
24, performing enhanced treatment of descaling, deoxidizing, sterilizing and inhibiting corrosion by the electron reduction method of the electric deionization cation processor on the outlet water after fine filtration; then:
and 25, treating the water reaching the standard by the fine water purification device for oil field reinjection or reuse.
The invention also discloses a combined device based on the shale oil and gas field produced water treatment method, which comprises a gas-liquid collection tank, a VOCs treatment device, a lift pump, a first mixer, an oil removal device, a second mixer, a mud removal device, a coarse purified water device, a fine purified water device, an air entrainment device, a dosing device, a gas-oil-water separator, a mud concentration and solidification device, a first material pump, a dosing tank, a second material pump and a backwashing pump;
the top of the gas-liquid collecting tank is provided with the VOCs treatment device, the top of the gas-liquid collecting tank is provided with a liquid pumping pipe orifice, and the lifting pump and the first mixer are arranged between the liquid pumping pipe orifice and the oil removal device;
the second mixer is arranged between the oil removing device and the mud removing device;
the mud removing device is communicated with the coarse purified water device, the fine purified water device and the fine purified water device through pipelines;
the gas adding device is used for adding gas into the oil removing device, the sludge removing device, the coarse water purifying device, the fine water purifying device and the fine water purifying device;
the medicine adding device is used for adding medicine into fluid in the device;
the gas-oil-water separator is communicated with the gas-liquid collecting tank and the oil removing device;
the slurry concentration and solidification device is communicated with the gas-liquid collecting tank, the mud removing device, the coarse purified water device, the fine purified water device and the fine purified water device;
the first material pump is communicated with the coarse water purification device;
the second material pump is communicated with the fine water purifying device and the fine water purifying device;
the feeding pool is communicated with the first material pump and the second material pump;
the backwashing pump is communicated with the refined water purifying device.
Optionally, the gas-liquid collecting tank is a horizontal round tank or a rectangular tank, an included angle between the gas-liquid collecting tank and a horizontal plane is 5-15 degrees, an air overflow port is arranged at the upper part of the gas-liquid collecting tank, and the air overflow port is communicated with the VOCs treatment device; the middle part of the gas-liquid collecting tank is provided with a gas-liquid inlet which is connected with a liquid inlet manifold; and the lower part of the gas-liquid collecting tank is provided with a liquid pumping pipe orifice which is connected with a liquid inlet pipe of the lifting pump.
Optionally, the VOCs treatment device is a vertical round tank or a rectangular tank, a skirt is arranged at the bottom of the VOCs treatment device, the skirt is located on an air overflow port of the gas-liquid collection tank, a tank body is located on the skirt, and a breathing gas pipe is arranged at the top of the tank body; a pore plate is arranged at the bottom in the tank body, a primary magnetic rod is arranged at the upper part of the pore plate, and iron-carbon micro-electrolysis filler is filled in the peripheral space of the primary magnetic rod; a secondary magnetic bar is arranged above the iron-carbon micro-electrolysis filler, and a magnet filter material is arranged in the peripheral space of the secondary magnetic bar; and a third-level magnetic bar is arranged above the magnet filter material, magnet powder is arranged in the peripheral space of the third-level magnetic bar, and a first electric deionization cation processor is arranged above the magnet powder.
Optionally, the first mixer is the same with the structure of second mixer, including vertical circular sleeve pipe, vertical circular sheathed tube outer tube bottom segment tangent line is equipped with the feed liquor pipe, vertical circular sleeve pipe top is provided with the respiratory tube, vertical circular sleeve pipe bottom and pipe are managed and are equipped with the drain pipe, vertical circular sleeve pipe bottom drain pipe periphery is equipped with the dual-purpose pipe of unloading and blowdown.
Optionally, the oil removal device is a vertical round tank, a liquid outlet pipe orifice is arranged at the center of the bottom of the oil removal device and connected with a liquid inlet pipe of the second mixer, a manhole is arranged at the middle lower part of a tank cylinder of the oil removal device, a liquid inlet pipe orifice is arranged at the top of the tank of the oil removal device and connected with a liquid outlet pipe of the first mixer, a first upper manhole is arranged at the periphery of the liquid inlet pipe orifice, an oil collecting pipe orifice is arranged on a first upper manhole cylinder section and connected with a liquid inlet pipe of the gas-oil-water separator, a gas filling pipe orifice is arranged at the middle upper part of the tank cylinder of the oil removal device and connected with a gas supply pipe of the gas filling device, a micro-vortex generator is arranged on a horizontal section above a gas filling pipe orifice in the tank cylinder of the oil removal device, a turbulence generator is arranged at the center above the micro-vortex generator, the liquid inlet pipe of the turbulence generator is connected with the liquid inlet pipe orifice of the tank top, and a second electronic processor is arranged on the wall above the periphery of the micro-vortex generator.
Optionally, the sludge removal device comprises a vertical circular tank, a cap-type sedimentation cylinder is coaxially arranged in the vertical circular tank, a cylinder section is arranged at the center of the bottom of the vertical circular tank, a water outlet pipe is arranged at the center of the cylinder section, and the water outlet pipe extends upwards to the upper part of the cap-type sedimentation cylinder; the water outlet pipe is connected with a water inlet pipe orifice of the coarse water purification device; a mud discharge pipe opening is formed in the side face of the shell ring and connected with a mud inlet pipe of the mud concentration and solidification device; a first lower manhole is arranged on the periphery of a lower end socket on the shell ring; a liquid inlet pipe orifice is arranged at the center of the top of the vertical round tank and is connected with a liquid outlet pipe of a second mixer, and a plurality of medicine adding pipe orifices are arranged on the liquid inlet pipe of the second mixer and are respectively connected with a medicine adding pipe of the medicine adding device; a second upper manhole is arranged on the periphery of a tank top liquid inlet pipe orifice of the vertical round tank, an operation sewage draining pipe orifice is arranged on the side wall of the second upper manhole, and the operation sewage draining pipe orifice is connected with the gas-liquid collecting tank liquid inlet pipe; a coalescence suspension ball is arranged between the outer wall of the cap type settling cylinder and the inner wall of the vertical circular tank, and a circular pore plate is arranged on the top of the cap type settling cylinder; the center of the upper surface of the circular orifice plate is provided with a turbulence generator, and a liquid inlet pipe of the turbulence generator is connected with a liquid inlet pipe orifice of the vertical circular tank.
Optionally, the coarse water purification device is a vertical circular tank, and a first water outlet and backwashing water inlet dual-purpose pipe orifice is arranged at the center of the bottom of the vertical circular tank; the first water outlet and backwashing water inlet dual-purpose pipe orifice is connected with a water inlet pipe of the fine water purification device, and the first water outlet and backwashing water inlet dual-purpose pipe orifice is connected with a water outlet pipe of the backwashing pump; an air-entrapping pipe orifice is arranged on the water inlet pipe of the fine water purification device and is connected with an air supply pipe of the air-entrapping device; a second lower manhole is arranged on the periphery of an end socket of the first water outlet and backwashing water inlet dual-purpose pipe orifice, a lower sewage draining pipe orifice is arranged on the periphery of the second lower manhole, and the lower sewage draining pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank; a lower discharge pipe orifice is arranged at the lower part of the tank cylinder of the vertical circular tank and connected with a feed pipe of the first material pump, a first middle manhole is arranged in the middle of the tank cylinder of the vertical circular tank, a water inlet pipe orifice is arranged on the first middle manhole, the outside of the water inlet pipe orifice is connected with a water outlet pipe of the sludge removal device, and the inside of the water inlet pipe orifice is connected with a central vortex cylinder in a tangent line manner; a feeding pipe orifice is arranged on the upper side of the water inlet pipe orifice and is connected with a discharging pipe of the first material pump; a third electric deionization cation processor is arranged on the upper edge of the feeding pipe orifice, a backwashing sewage discharge pipe orifice is arranged in the center of the tank top of the vertical circular tank, a third upper manhole is arranged on the periphery of the backwashing sewage discharge pipe orifice of the tank top of the vertical circular tank, an operating sewage discharge pipe orifice is arranged on a third upper manhole shell ring, and the operating sewage discharge pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank; an annular lower sieve plate is arranged in an annular space below an in-tank lower discharge pipe of the vertical round tank, a vortex cylinder is arranged in the center of the annular lower sieve plate, coarse filter materials are arranged on the annular lower sieve plate, an annular upper sieve plate is arranged on a coarse filter material layer, and a third electronic cation elimination processor is arranged on the upper edge of the annular upper sieve plate; and a blow-down pipe orifice is arranged on the side surface of the tank bottom end socket of the vertical round tank and communicated with a liquid inlet pipe of the gas-liquid collecting tank.
Optionally, the fine water purification device and the fine water purification device have the same structure, and include a vertical circular tank, and the fine water purification device share one second material pump;
a second water outlet and backwashing water inlet dual-purpose pipe orifice is arranged at the center of the bottom of the vertical round tank, wherein the water outlet pipe orifice of the fine purification water device is connected with the water inlet pipe of the fine purification water device, and the second water outlet and backwashing water inlet dual-purpose pipe orifice is connected with the water outlet pipe of the backwashing pump; a third lower manhole is arranged on the periphery of the lower end socket above the second water outlet and backwashing water inlet dual-purpose pipe orifice; a fourth electric cation removing processor is arranged on the periphery of the lower portion of the tank cylinder of the vertical circular tank, a lower discharge pipe and a lower discharge pipe of the refined water purifying device are arranged on the fourth electric cation removing processor and connected in parallel with an inlet of the shared second material pump, a second middle manhole is arranged in the middle of the tank cylinder of the vertical circular tank, an upper feeding pipe is arranged on the second middle manhole, and the upper feeding pipe of the refined water purifying device are connected in parallel with an outlet of the shared second material pump;
the tank top of the vertical round tank is provided with a water inlet and backwashing sewage discharge dual-purpose pipe orifice, wherein the water inlet and backwashing sewage discharge dual-purpose pipe orifice is connected with a water outlet pipe of the coarse water purification device; the dual-purpose pipe orifice for water inlet and backwashing sewage discharge is connected with a liquid inlet pipe of the gas-liquid collecting tank; a fourth upper manhole is arranged on the periphery of the pipe orifice for the water inlet and backwashing sewage discharge, an operation sewage discharge pipe orifice is arranged on a cylinder section of the fourth upper manhole, and the operation sewage discharge pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank; a lower sieve plate is arranged between the fourth electro-cation processor and the lower discharge hole of the fine water purifying device, a fine filter material is arranged on the lower sieve plate, an upper sieve plate is arranged above the fine filter material and the upper feed hole, a fine turbulence generator is arranged in the center of the upper surface of the upper sieve plate, and a liquid inlet pipe of the fine turbulence generator is connected with an inner opening of a water inlet and backwashing blowdown dual-purpose pipe orifice;
the liquid inlet pipe of the fine turbulence generator is connected with the inner opening of the dual-purpose pipe opening for water inlet and backwashing sewage discharge at the top of the tank of the fine water purification device;
the diameters of the turbulence generators of the fine water purifying device and the fine water purifying device are different, and the sizes of the apertures of the sieve plates and the particle sizes of the filter materials are different.
Optionally, the gas adding device comprises an air compressor, a nitrogen making machine and a gas storage tank; the air outlet end of the air compressor is connected with the air inlet end of the nitrogen making machine, the air outlet of the nitrogen making machine is communicated with the air storage tank, and the air storage tank is communicated with the oil removing device, the mud removing device, the coarse purified water device, the fine purified water device and the fine purified water device.
Optionally, the dosing device comprises a demulsifier dosing device, a glue aggregating agent dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a settling accelerator dosing device;
NaOH is added into the glue polymerization agent adding device; PAC is added into the flocculant dosing device; PAM is added into the coagulant aid dosing device; the precipitation accelerator dosing device is added with silica-dried soil and barite powder for compounding.
Optionally, the gas-oil-water separator comprises a vertical circular tank, a water outlet pipe orifice is arranged at the center of the bottom of the vertical circular tank, an inner cylinder is arranged in the middle of the vertical circular tank, the bottom end of the water outlet pipe orifice is connected with one end of the inner cylinder, and the other end of the inner cylinder is connected with a liquid inlet pipe of the gas-liquid collecting tank; an oil collecting pipe is arranged in the middle of the vertical round tank and is connected with an oil system pipeline; the manhole is arranged in the middle of the tank cylinder of the vertical round tank; a tangent water inlet pipe orifice is arranged on the side surface of the tank body of the vertical round tank and is connected with an oil collecting pipe orifice of the oil removing device; and the center of the top of the vertical round tank is provided with an exhaust pipe orifice, and the exhaust pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank.
Optionally, the slurry concentration and solidification device includes a slurry pump and a concentration and solidification all-in-one machine, an inlet of the slurry pump is communicated with the mud removal device, and an outlet of the slurry pump is communicated with the concentration and solidification all-in-one machine.
Compared with the prior art, the invention achieves the following technical effects:
the shale oil and gas field produced water treatment method and the combined device have the advantages that the combined treatment process technology is simple and practical, the selected devices have multiple functions, the size is small, the skid-mounted device is convenient to install, the device is a fully-closed treatment process, VOCs (volatile organic compounds) are not volatilized, sludge falls to the ground, the operation is safe and environment-friendly, the most prominent point is that the problem that the produced liquid of the shale oil and gas field is difficult to treat is solved, and the treated water quality reaches the standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a combined apparatus of the present invention;
FIG. 2 is a combination diagram of a holding tank and VOCs remediation device;
FIG. 3 is a block diagram of a mixer;
FIG. 4 is an external view of the oil removing device;
FIG. 5 is a view showing the internal structure of the oil removing device;
FIG. 6 is an external view of the sludge removing apparatus;
FIG. 7 is a view showing the internal structure of the sludge removing apparatus;
FIG. 8 is an outline view of a rough water purification apparatus;
FIG. 9 is a view showing an internal structure of a raw water purification apparatus;
FIG. 10 is an external view of a fine and refined water purification apparatus;
FIG. 11 is an internal structure view of a water purification apparatus for refining and purifying water
FIG. 12 is an assembled view of the air entrainment device;
FIG. 13 is a view of the applicator assembly;
FIG. 14 is a view showing the structure of a gas-oil-water separator;
FIG. 15 is a combination view of the slurry thickening and solidifying apparatus.
In the figure: 1. a gas-liquid collection tank; 1-1, an air overflow port; 1-2, gas-liquid inlet; 1-3, a liquid pumping pipe orifice; 2. a VOCs treatment device; 2-1, skirt; 2-2, a tank body; 2-3, respiratory trachea; 2-4, a pore plate; 2-5, primary magnetic bars; 2-6, iron-carbon micro-electrolysis filler; 2-7, a secondary magnetic rod; 2-8, magnet filtering material; 2-9, three-level magnetic rods; 2-10 parts of magnet powder; 2-11, a first electrodeionization cation processor;
3. a lift pump;
4. a first mixer; 4-1, a liquid inlet pipe; 4-2, a breathing tube; 4-3, a liquid outlet pipe; 4-4, emptying and discharging a sewage dual-purpose pipe;
5. an oil removing device; 5-1, a liquid outlet pipe orifice; 5-2, a first manhole; 5-3, a first liquid inlet pipe orifice; 5-4, a first upper manhole; 5-5, oil collecting pipe orifice; 5-6, air-entrapping pipe orifice; 5-7, a micro-rotation floating generator; 5-8, a first turbulence generator; 5-9, a second electrodeionization cation processor;
6. a second mixer;
7. a mud removal device; 7-1, cylindrical sections; 7-2, a first water outlet pipe; 7-3, a sludge discharge pipe opening; 7-4, a first lower manhole; 7-5 parts of a liquid inlet pipe orifice II; 7-6, a second upper manhole; 7-7, a first operation sewage discharging pipe orifice; 7-8, a cap type settling cylinder; 7-9, coalescence suspension balls; 7-10 parts of a circular pore plate; 7-11, a second turbulence generator;
8. a water rough purification device; 8-1, a first water outlet and backwashing water inlet dual-purpose pipe orifice; 8-2, a second lower manhole; 8-3, a lower discharge pipe orifice; 8-4, a first middle manhole; 8-5, water inlet pipe mouth; 8-6, a feeding pipe opening; 8-7, a third electric deionization ion processor; 8-8, backwashing the sewage pipe orifice; 8-9, a third upper manhole; 8-10, operating the upper sewage discharge pipe orifice; 8-11, annular lower sieve plate; 8-12, a vortex tube; 8-13, coarse filtering; 8-14, an annular upper sieve plate; 8-15, running a lower sewage pipe orifice;
9. a fine water purification device; 9-1, a second water outlet and backwashing water inlet dual-purpose pipe orifice; 9-2, a third lower manhole; 9-3, a fourth electrodeionization cation processor; 9-4, discharging the pipe; 9-5, a second middle manhole; 9-6, an upper feeding pipe; 9-7, a dual-purpose pipe orifice for water inlet and backwashing sewage discharge; 9-8, a fourth upper manhole; 9-9, a second operation sewage discharge pipe orifice; 9-10, lower sieve plate; 9-11, fine filtering; 9-12, mounting a sieve plate; 9-13, fine turbulence generators;
10. a fine water purification device;
11. a gas filling device; 11-1, an air compressor; 11-2, a nitrogen making machine; 11-3, a gas storage tank;
12. a dosing device; 12-1, a demulsifier dosing device; 12-2, adding a glue agent adding device; 12-3, a flocculating agent dosing device; 12-4, a coagulant aid dosing device; 12-5, a precipitation accelerator dosing device;
13. a gas-oil-water separator; 13-1, a second water outlet pipe orifice; 13-2, inner cylinder; 13-3, collecting oil pipes; 13-4, a second manhole; 13-5, cutting a water inlet pipe orifice; 13-6, an exhaust pipe orifice;
14. a slurry concentration and solidification device; 14-1, a mud pump; 14-2, concentrating and curing integrated machine;
15. a first material pump; 16. a feeding tank; 17. a second material pump; 18. and (4) backwashing the pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment provides a method for treating water produced by a shale oil and gas field, which comprises the following steps:
step 1, collecting waste gas and waste liquid of an oil field into a gas-liquid collecting tank 1 through a liquid collecting pipeline, allowing gas separated by gravity in the gas-liquid collecting tank 1 to enter a VOCs treatment device 2 through an air overflow port 1-1, and completing treatment of volatile VOCs in the VOCs treatment device 2 by using an electronic reduction method; the other function of the VOCs treatment device 2 can also play a role of a breather valve, and the device can exhale and inhale during operation so as to ensure the pressure balance and safe operation in the gas-liquid collecting tank 1; simultaneously:
step 2, pumping the liquid in the gas-liquid collecting tank 1 out of a bottom dirt collecting groove in the gas-liquid collecting tank 1 by a lifting pump 3, and adding a demulsifier into the liquid passing through by a dosing device 12 when the liquid passes through a liquid outlet pipe 4-3 line of the lifting pump 3; then:
step 6, when the deoiled liquid is discharged through the first water outlet pipe 7-2, the gelling agent, the flocculating agent, the coagulant aid and the sedimentation promoting agent are added into the liquid in the liquid outlet pipe 4-3 through the dosing device 12, and then the mixture enters the vertical homogenizing pipeline mixer-2 tangentially; then:
step 9, the liquid after being added with the chemicals is placed in a mud removing device 7, and eddy current coagulation and centrifugal mud removal are completed by sequentially utilizing eddy current cylinders 8-12; utilizing the adsorption coalescence suspension balls 7-9 to complete coalescence desilting; utilizing a settling cylinder to finish gravity settling and desilting; simultaneously:
step 10, exhausting the sewage from the upper part of the sludge removing device 7 into the intake liquid collecting tank 1; simultaneously:
step 11, the lower mud discharged from the mud removing device 7 enters a mud concentration and solidification device 14; then:
step 12, bagging and transporting the dry mud after concentration and solidification by a mud concentration and solidification device 14, and allowing separated water to automatically flow into a gas-liquid collecting tank 1; simultaneously:
step 15, the whirling water after centrifugal separation is screwed out through an overflow port at the upper part and enters an electric cation eliminator for electronic treatment, and an electronic reduction method is utilized to finish one-time treatment of scale prevention, sterilization and corrosion inhibition; then:
step 16, turning the eddy water after the treatment of scale prevention, sterilization and corrosion inhibition by an electronic reduction method downwards to enter a rough filtering layer for rough filtering; then:
step 17, after coarse filtration, feeding the effluent of the coarse water purification device 8 into a fine water purification device 9 (9) for fine treatment after aerating on a water outlet pipe 7-2; then:
step 19, redirecting the eddy current condensed water in the fine water purification device 9 downwards to enter a fine filter material 9-11 layer, and intercepting part of emulsified oil fine particles by the fine filter material 9-11; then:
step 20, performing secondary treatment of breaking emulsified particles, preventing scale, sterilizing and inhibiting corrosion by an electron reduction method of an electric deionization cation processor on the finely filtered water; then:
step 21, the effluent treated by the water refining device 9 enters the water refining device 10 after being aerated again by the air-aerating device 11 in the first water outlet pipe 7-2, and then:
step 22, in the water purifying device 10, water firstly enters a central first turbulence generator 5-8 from the top, and a fine turbulence generator 9-13 is used for finishing jetting negative pressure to remove trace oil of emulsified particles cracked by an electric deionization cation processor of the water purifying device; swirling and re-coagulating by using a circular tank barrel to promote fine particles; the oil gas is separated from the upper drain pipe of the device and enters the gas-liquid collecting tank 1, and simultaneously:
23, redirecting the eddy water subjected to oil removal by the fine turbulent air flotation and coagulation downwards to enter a fine filtering layer, and intercepting fine particles and fine oil droplets by a fine filtering material; then:
24, performing enhanced treatment of descaling, deoxidizing, sterilizing and inhibiting corrosion by the electron reduction method of the electric deionization processor on the outlet water after fine filtration; then:
and 25, treating the water reaching the standard by the water purifying device 10 for reinjection or reuse in the oil field.
To sum up, the treatment device of the main treatment process can select three-stage treatment, four-stage treatment or five-stage treatment according to different inlet and outlet water quality:
first-stage: the oil removing device 5 is an oil removing process which takes physical oil removal as a main part and chemical oil removal as an auxiliary part;
first-stage: the oil removal rate of the oil removal device 5 is more than or equal to 90 percent;
and (2) second stage: the sludge removing device 7 is a sludge removing process which takes physical sludge removal as the main part and chemical sludge removal as the auxiliary part,
and (2) second stage: the mud removal rate of the mud removal device 7 is more than or equal to 85 percent;
third-stage: the coarse water purification device 8 is a pure physical method coarse water purification process,
wherein, the pore space of the upper sieve plate 9-10 and the lower sieve plate 10 is 300-500 μm, the grain size of the coarse filter material 8-13 is 900-1200 μm;
the effluent after the coarse treatment reaches grade III indexes of SY/T5329-2012 (namely, the oil content in the water is less than or equal to 15mg/l, the suspended solid content is less than or equal to 5mg/l, and the median value of the particle size in the water is less than or equal to 3 mu m);
four stages: the fine water purification device 9 is a pure physical fine treatment process,
wherein the hole plate diameter of the first turbulence generators 5-8 is 10-20 mm; the pore space of the upper sieve plate 9-10 and the lower sieve plate is 100-300 μm; the grain diameter of the fine filter material 9-11 is 600-900 μm;
the effluent after the fine treatment reaches grade II indexes of SY/T5329-2012 (namely, the oil content in the water is less than or equal to 6mg/l, the suspended solid content is less than or equal to 2mg/l, and the median value of the particle size in the water is less than or equal to 1.5 mu m);
and (5) fifth stage: the water purifying device 10 adopts a physical refining process,
wherein, the hole diameter of the hole plate of the first turbulence generator 5-8 is 5-10 mm; the pore space of the upper sieve plate 9-10 and the lower sieve plate 10 is 50-100 μm; the grain size of the fine filter material is 300-600 mu m;
the effluent after the fine treatment reaches the highest standard requirement of grade I index of SY/T5329-2012 (namely, the oil content in water is less than or equal to 5mg/l, the suspended solid content is less than or equal to 1mg/l, and the median value of the particle size in water is less than or equal to 1 mu m).
Example two
As shown in fig. 1 to 15, the present embodiment discloses a combination device based on the method for treating produced water in a shale oil and gas field, which includes a gas-liquid collection tank 1, a VOCs treatment device 2, a lift pump 3, a first mixer 4, a deoiling device 5, a second mixer 6, a desliming device 7, a coarse purified water device 8, a fine purified water device 9, a purified water device 10, an air-entrapping device 11, a dosing device 12, a gas-oil-water separator 13, a slurry concentration and solidification device 14, a first material pump 15, a dosing tank 16, a second material pump 17 and a backwash pump 18; the top of the gas-liquid collecting tank 1 is provided with a VOCs treatment device 2, the top of the gas-liquid collecting tank 1 is provided with a liquid pumping pipe orifice 1-3, and a lifting pump 3 and a first mixer 4 are arranged between the liquid pumping pipe orifice 1-3 and the oil removal device 5; a second mixer 6 is arranged between the oil removing device 5 and the sludge removing device 7; the mud removing device 7 is communicated with the coarse water purifying device 8, the fine water purifying device 9 and the fine water purifying device 10 through pipelines; the gas adding device 11 is used for adding gas into the oil removing device 5, the sludge removing device 7, the coarse water purifying device 8, the fine water purifying device 9 and the fine water purifying device 10; the dosing device 12 is used to add a medicament into the fluid within the device; the gas-oil-water separator 13 is communicated with the gas-liquid collecting tank 1 and the oil removing device 5; the slurry concentration and solidification device 14 is communicated with the gas-liquid collecting tank 1, the mud removing device 7, the coarse water purifying device 8, the fine water purifying device 9 and the fine water purifying device 10; the first material pump 15 is communicated with the coarse water purification device 8; the second material pump 17 is communicated with the water refining device 9 and the water refining device 10; the feeding tank 16 is communicated with the first material pump 15 and the second material pump 17; the backwash pump 18 is communicated with the rough purified water device 8, the fine purified water device 9 and the fine purified water device 10.
In the embodiment, the gas-liquid collection tank 1 is a horizontal round tank, in other embodiments, the gas-liquid collection tank 1 can also be a horizontal rectangular tank, in the embodiment, the included angle between the gas-liquid collection tank 1 and the horizontal plane is 10 degrees, the upper part of the gas-liquid collection tank 1 is provided with an air overflow port 1-1, and the air overflow port 1-1 is communicated with the VOCs treatment device 2; the middle part of the gas-liquid collecting tank 1 is provided with a gas-liquid inlet 1-2, and the gas-liquid inlet 1-2 is connected with a liquid inlet pipe 4-1 in a gathering way; the lower part of the gas-liquid collecting tank 1 is provided with a liquid pumping pipe orifice 1-3, and the liquid pumping pipe orifice 1-3 is connected with a liquid inlet pipe 4-1 of the lifting pump 3.
The VOCs treatment device 2 is a vertical circular tank or a rectangular tank, the bottom of the VOCs treatment device 2 is provided with a skirt 2-1, the skirt 2-1 is located on an air overflow port 1-1 of the gas-liquid collection tank 1, the skirt 2-1 is provided with a tank body 2-2, and the top of the tank body 2-2 is provided with a breathing air pipe 2-3; the bottom in the tank body 2-2 is provided with a pore plate 2-4, the upper part of the pore plate 2-4 is provided with a primary magnetic rod 2-5, and the peripheral space of the primary magnetic rod 2-5 is filled with iron-carbon micro-electrolysis filler 2-6; a secondary magnetic rod 2-7 is arranged above the iron-carbon micro-electrolysis filler 2-6, and a magnet filter material 2-8 is arranged in the peripheral space of the secondary magnetic rod 2-7; a third-level magnetic rod 2-9 is arranged above the magnet filter material 2-8, magnet powder 2-10 is arranged in the peripheral space of the third-level magnetic rod 2-9, and a first electro-deionization cation processor 2-11 is arranged above the magnet powder 2-10.
The first mixer 4 and the second mixer 6 have the same structure and comprise a vertical circular sleeve, a liquid inlet pipe 4-1 is arranged at the tangent of the bottom section of the outer pipe of the vertical circular sleeve, an exhaust pipe 4-2 is arranged at the top of the vertical circular sleeve, a liquid outlet pipe 4-3 is arranged at the bottom of the vertical circular sleeve and the pipe center, and a dual-purpose pipe 4-4 for emptying and discharging is arranged at the periphery of the liquid outlet pipe 4-3 at the bottom of the vertical circular sleeve.
The oil removing device 5 is a vertical circular tank, a liquid outlet pipe orifice 5-1 is arranged in the center of the bottom of the oil removing device 5 and is connected with a liquid inlet pipe 4-1 of a second mixer 6, a manhole 5-2 is arranged at the middle lower part of a tank cylinder of the oil removing device 5, a first liquid inlet pipe orifice 5-3 is arranged at the top of the oil removing device 5, the first liquid inlet pipe orifice 5-3 is connected with a liquid outlet pipe 4-3 of the first mixer 4, a first upper manhole 5-4 is arranged at the periphery of the first liquid inlet pipe orifice 5-3, an oil collecting pipe orifice 5-5 is arranged on a cylinder section 7-1 of the first upper manhole 5-4, the oil collecting pipe orifice 5-5 is connected with a liquid inlet pipe 4-1 of a gas-oil-water separator 13, a gas filling pipe orifice 5-6 is arranged at the middle upper part of the tank cylinder of the oil removing device 5, the gas filling pipe orifice 5-6 is connected with a gas supply pipe of a gas filling device 11, a micro-vortex generator 5-7 is arranged on a horizontal section above a gas filling pipe wall orifice in the tank cylinder of the oil removing device 5, a vortex generator 5-7 is arranged at the center above the micro-7, a vortex generator 5-8 is connected with a vortex generator on the periphery of the second vortex generator 5-5, and a vortex generator on the top of the second vortex generator 5-3.
The sludge removing device 7 comprises a vertical circular tank, a cap type settling cylinder 7-8 is coaxially arranged in the vertical circular tank, a cylinder section 7-1 is arranged at the center of the bottom of the vertical circular tank, a first water outlet pipe 7-2 is arranged at the center of the cylinder section 7-1, and the first water outlet pipe 7-2 extends upwards to the upper part of the cap type settling cylinder 7-8; the first water outlet pipe 7-2 is connected with a water inlet pipe orifice 8-5 of the coarse water purification device 8; a sludge discharge pipe opening 7-3 is formed in the side face of the cylindrical section 7-1, and the sludge discharge pipe opening 7-3 is connected with a sludge inlet pipe of a sludge concentration and solidification device 14; a first lower manhole 7-4 is arranged on the periphery of a lower seal head on the shell ring 7-1; a second liquid inlet pipe orifice 7-5 is arranged at the center of the top of the vertical round tank, the second liquid inlet pipe orifice 7-5 is connected with a liquid outlet pipe of a second mixer 6, and a plurality of medicine adding pipe orifices are arranged on the liquid inlet pipe of the second mixer 6 and are respectively connected with a medicine adding pipe of a medicine adding device 12; a second upper manhole 7-6 is arranged on the periphery of a second liquid inlet pipe orifice 7-5 on the top of the vertical round tank, an operation sewage discharging pipe orifice 7-7 is arranged on the side wall of the second upper manhole 7-6, and the operation sewage discharging pipe orifice 7-7 is connected with a liquid inlet pipe of the gas-liquid collecting tank 1; a coalescence suspension ball 7-9 is arranged between the outer wall of the cap type sedimentation cylinder 7-8 and the inner wall of the vertical circular tank, and a circular pore plate 7-10 is arranged at the top of the cap type sedimentation cylinder 7-8; the center of the upper surface of the round orifice plate 7-10 is provided with a second turbulence generator 7-11, and a liquid inlet pipe 4-1 of the second turbulence generator 7-11 is connected with a second liquid inlet pipe mouth 7-5 of the vertical round tank.
The water rough purification device 8 is a vertical circular tank, and a first water outlet and backwashing water inlet dual-purpose pipe orifice 8-1 is arranged at the center of the bottom of the vertical circular tank; wherein, the first outlet and backwash water inlet dual-purpose pipe orifice 8-1 is connected with the water inlet pipe of the fine water purification device 9, and the first outlet and backwash water inlet dual-purpose pipe orifice 8-1 is connected with the water outlet pipe of the backwash pump 18; the water inlet pipe of the fine water purification device 9 is provided with an air-adding pipe orifice 5-6, and the air-adding pipe orifice 5-6 is connected with an air supply pipe of an air-adding device 11; a second lower manhole 8-2 is arranged at the periphery of an end socket of the first water outlet and backwashing water inlet dual-purpose pipe orifice 8-1, a lower sewage draining pipe orifice is arranged at the periphery of the second lower manhole 8-2, and the lower sewage draining pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank 1; the lower part of a tank cylinder of the vertical circular tank is provided with a lower discharge pipe opening 8-3 which is connected with a feed pipe of a first material pump 15, the middle part of the tank cylinder of the vertical circular tank is provided with a first middle manhole 8-4, the first middle manhole 8-4 is provided with a water inlet pipe opening 8-5, the outside of the water inlet pipe opening 8-5 is connected with a water outlet pipe of a sludge removing device 7, and the inside of the water inlet pipe opening 8-5 is connected with a tangent line of a central vortex cylinder 8-12; a feeding pipe orifice 8-6 is arranged on the upper side of the water inlet pipe orifice 8-5, and the feeding pipe orifice 8-6 is connected with a discharging pipe of the first material pump 15; a third electronic deionization cation processor 8-7 is arranged on the upper edge of the feeding pipe orifice 8-6, a backwashing sewage pipe orifice 8-8 is arranged at the center of the tank top of the vertical circular tank, a third upper manhole 8-9 is arranged on the periphery of the backwashing sewage pipe orifice 8-8 of the tank top of the vertical circular tank, an operating upper sewage pipe orifice 8-10 is arranged on a cylinder section of the third upper manhole 8-9, and the operating upper sewage pipe orifice 8-10 is connected with a liquid inlet pipe 4-1 of the gas-liquid collecting tank 1; an annular lower sieve plate 8-11 is arranged in an annular space below an in-tank lower discharge pipe 9-4 of the vertical round tank, a vortex cylinder 8-12 is arranged in the center of the annular lower sieve plate 8-11, a coarse filter 8-13 is arranged on the annular lower sieve plate 8-11, an annular upper sieve plate 8-14 is arranged on a layer of the coarse filter 8-13, and a third electronic cation processor 8-7 is arranged on the upper side of the annular upper sieve plate 8-14; the side surface of the tank bottom end socket of the vertical round tank is provided with a running lower sewage discharging pipe orifice 8-15, and the running lower sewage discharging pipe orifice 8-15 is communicated with a liquid inlet pipe of the gas-liquid collecting tank 1.
The fine water purification device 9 and the fine water purification device 10 have the same structure and comprise a vertical circular tank, and the fine water purification device 9 and the fine water purification device 10 share one second material pump 17.
A second water outlet and backwashing water inlet dual-purpose pipe orifice 9-1 is arranged at the center of the bottom of the vertical round tank, wherein the water outlet pipe orifice of the fine purification water device 9 is connected with the water inlet pipe of the fine purification water device 10, and the second water outlet and backwashing water inlet dual-purpose pipe orifice 9-1 is connected with the water outlet pipe of the backwashing pump 18; a third lower manhole 9-2 is arranged on the periphery of the lower end socket above the second water outlet and backwashing water inlet dual-purpose pipe orifice 9-1; a fourth electric deionization cation processor 9-3 is arranged on the periphery of the lower part of a tank cylinder of the vertical circular tank, a lower discharge pipe 9-4 and a lower discharge pipe 9-4 of a refined water purifying device 10 are arranged on the fourth electric deionization cation processor 9-3 and connected in parallel with an inlet of a shared second material pump 17, a second middle manhole 9-5 is arranged in the middle of the tank cylinder of the vertical circular tank, an upper feed pipe 9-6 is arranged on the second middle manhole 9-5, and the upper feed pipe 9-6 of the refined water purifying device 10 are connected in parallel with an outlet of the shared second material pump 17;
the tank top of the vertical round tank is provided with a dual-purpose pipe orifice 9-7 for water inlet and backwashing and sewage discharge, wherein the dual-purpose pipe orifice 9-7 for water inlet and backwashing and sewage discharge is connected with a water outlet pipe of a coarse water purification device 8; a water inlet pipe orifice 9-7 for backwashing and sewage disposal is connected with a liquid inlet pipe 4-1 of the gas-liquid collecting tank 1; a fourth upper manhole 9-8 is arranged at the periphery of the water inlet and backwashing sewage discharge dual-purpose pipe orifice 9-7, a second operation sewage discharge pipe orifice 9-9 is arranged on a cylinder section of the fourth upper manhole 9-8, and the second operation sewage discharge pipe orifice 9-9 is connected with a liquid inlet pipe 4-1 of the gas-liquid collecting tank 1; a lower sieve plate 9-10 is arranged between a fourth electric cation eliminator 9-3 and a lower discharge port of the fine water purification device 9, a fine filter material 9-11 is arranged on the lower sieve plate 9-10, an upper sieve plate 9-12 is arranged above the fine filter material 9-11 and an upper feed port, a fine turbulence generator 9-13 is arranged in the center of the upper surface of the upper sieve plate 9-12, and a liquid inlet pipe of the fine turbulence generator 9-13 is connected with an inner port of a pipe orifice 9-7 for water inlet and backwashing sewage discharge;
the liquid inlet pipe of the fine turbulence generator is connected with the inner opening of a tank top water inlet and backwashing sewage discharge dual-purpose pipe opening 9-7 of the fine purification water device 10;
the air-entrapping device 11 comprises an air compressor 11-1 and turbulence generators of the fine water purification device 9 and the fine water purification device 10, and the aperture, the sieve plate pore and the particle size of the filter material are different.
A nitrogen making machine 11-2 and a gas storage tank 11-3; the air outlet end of the air compressor 11-1 is connected with the air inlet end of the nitrogen making machine 11-2, the air outlet of the nitrogen making machine 11-2 is communicated with the air storage tank 11-3, and the air storage tank 11-3 is communicated with the oil removing device 5, the mud removing device 7, the coarse purified water device 8, the fine purified water device 9 and the fine purified water device 10.
The dosing device 12 comprises a demulsifier dosing device 12-1, a glue aggregating agent dosing device 12-2, a flocculating agent dosing device 12-3, a coagulant aid dosing device 12-4 and a settling accelerator dosing device 12-5;
NaOH is added into the glue polymerization agent adding device 12-2; adding PAC into a flocculating agent dosing device 12-3; PAM is added into the coagulant aid dosing device 12-4; the precipitation accelerator dosing device 12-5 is added with silica-dried soil and barite powder for compounding.
The gas-oil-water separator 13 comprises a vertical circular tank, the center of the bottom of the vertical circular tank is provided with a water outlet pipe orifice, the middle of the vertical circular tank is provided with an inner cylinder 13-2, the bottom end of the water outlet pipe orifice is connected with one end of the inner cylinder 13-2, and the other end of the inner cylinder 13-2 is connected with a liquid inlet pipe of the gas-liquid collecting tank 1; an oil collecting pipe 13-3 is arranged in the middle of the vertical round tank, and the oil collecting pipe 13-3 is connected with an oil system pipeline; the middle part of the tank cylinder of the vertical round tank is provided with a second manhole 13-4; a tangent water inlet pipe opening 13-5 is arranged on the side surface of the tank body 2-2 of the vertical round tank, and the tangent water inlet pipe opening 13-5 is connected with an oil collecting pipe opening 5-5 of the oil removing device 5; the center of the top of the vertical round tank is provided with an exhaust pipe opening 13-6, and the exhaust pipe opening 13-6 is connected with a liquid inlet pipe of the gas-liquid collecting tank 1.
The mud concentration and solidification device 14 comprises a mud pump 14-1 and a concentration and solidification all-in-one machine 14-2, wherein the inlet of the mud pump 14-1 is communicated with the mud removal device 7, and the outlet of the mud pump 14-1 is communicated with the concentration and solidification all-in-one machine 14-2.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (10)
1. The method for treating the produced water of the shale oil and gas field is characterized by comprising the following steps of:
step 1, collecting waste gas and waste liquid of an oil field into a gas-liquid collecting tank through a liquid collecting pipeline, allowing gas separated by gravity in the gas-liquid collecting tank to enter a VOCs treatment device through an overflow port, and finishing treatment on volatile VOCs in the VOCs treatment device by using an electronic reduction method; the other function of the VOCs treatment device can also play a role of a breather valve, and the device can exhale and inhale during operation so as to ensure the pressure balance and safe operation in the gas-liquid collection tank; simultaneously:
step 2, pumping the liquid in the gas-liquid collecting tank out of a sewage collecting tank at the bottom of the gas-liquid collecting tank by a lift pump, and adding a demulsifier into the liquid passing through the liquid feeding device when the liquid passes through a liquid outlet pipeline of the lift pump; then:
step 3, enabling the liquid added with the demulsifier to tangentially enter a first mixer of the vertical homogenizing pipeline, enabling the medicament and the liquid to be uniformly mixed in the first mixer through vortex disturbance, and enabling the uniformly mixed liquid to enter an oil removal device after gas is added into the liquid through a gas filling device when the uniformly mixed liquid is discharged from a liquid outlet pipe at the lower part through a central pipe; then:
step 4, sequentially utilizing a turbulence generator to finish negative pressure jet oil removal in the oil removal device, utilizing a circular tank to finish vortex centrifugal oil removal, utilizing an electrodeionization cation processor and electrons to finish reduction demulsification oil removal, and then utilizing a micro-vortex generator to finish oil-water separation treatment of micro-floatation oil removal; simultaneously:
step 5, recovering the oil gas separated by air floatation into a gas-oil-water separator through an upper oil collecting pipe, separating gas, oil and water in the separator through centrifugation, buoyancy, gravity and sedimentation, separating the upper gas and the lower water to flow back into an inlet gas-liquid collecting tank, and recovering the separated oil to an oil system through a central oil collecting pipe; simultaneously:
step 6, when the deoiled liquid is discharged through a water outlet pipe, adding the gelling agent, the flocculating agent, the coagulant aid and the precipitation accelerator into the liquid in the water outlet pipe through a dosing device, and then tangentially feeding the mixture into a vertical homogeneous pipeline mixer-2; then:
step 7, adding the liquid containing the gelling agent, the flocculating agent, the coagulant aid and the sedimentation promoting agent into a second mixer of the vertical homogenizing pipeline, uniformly mixing various medicaments and the liquid through vortex disturbance, and then discharging the mixture from a liquid outlet pipe at the lower part through a central pipe; then:
step 8, when the liquid is discharged from the liquid outlet pipe of the second mixer, adding gas into the liquid through the gas filling device, and then feeding the liquid into the mud removing device; then:
step 9, sequentially utilizing a vortex cylinder to complete vortex coagulation and centrifugal desilting of the liquid after dosing in a desilting device; utilizing the adsorption coalescence suspension ball to complete coalescence and desilting; utilizing a settling cylinder to finish gravity settling and desilting; simultaneously:
step 10, exhausting the upper part of a sludge removal device into a gas-liquid collection tank; simultaneously:
step 11, feeding the lower mud discharged from the mud removing device into a mud concentration and solidification device; then:
step 12, bagging and transporting the dry mud after concentration and solidification by a mud concentration and solidification device, and allowing separated water to automatically flow into a gas-liquid collection tank; simultaneously:
step 13, aerating the effluent of the sludge removal device in an effluent pipeline through an aerating device, and then feeding the effluent into a coarse water purification device; then:
step 14, in the coarse water purification device, water firstly enters a central vortex cylinder at the tangent line of a water inlet pipe at the middle upper part of the tank body, and vortex coagulation sludge removal and centrifugal oil, gas and water separation are completed by utilizing the vortex cylinder; mud, oil, the water of isolating are in the gas-liquid collection jar through the upper and lower blowdown of coarse purification water installation, simultaneously:
step 15, the whirling water after centrifugal separation is screwed out through an overflow port at the upper part and enters an electric cation eliminator for electronic treatment, and an electronic reduction method is utilized to finish one-time treatment of scale prevention, sterilization and corrosion inhibition; then:
step 16, turning the eddy water subjected to the scale prevention, sterilization and corrosion inhibition treatment by an electronic reduction method downwards to enter a coarse filtration layer for coarse filtration; then:
step 17, after coarse filtration, discharging water from the coarse water purification device, aerating the water on a water outlet pipe, and then feeding the water into a fine water purification device (9) for fine treatment; then:
step 18, in the fine water purification device, aerated water firstly enters a central fine turbulence generator from the top, and the fine turbulence generator is utilized to finish spraying negative pressure to remove suspended oil; removing the dispersed oil by using vortex centrifugation of a circular tank barrel; in the last exhaust pipe gas-liquid collection jar of separation oil gas follow device, simultaneously:
step 19, redirecting eddy current condensed water in the fine water purification device downwards to enter a fine filter material layer, and intercepting part of emulsified oil fine particles by the fine filter material; then:
step 20, performing secondary treatment of breaking emulsified particles, preventing scale, sterilizing and inhibiting corrosion by an electron reduction method of an electric deionization cation processor on the finely filtered water; then:
step 21, the effluent treated by the fine purification water device enters the fine purification water device after being aerated again by the air-entrapping device in the effluent pipe, and then:
step 22, in the fine water purification device, water firstly enters a central fine turbulence generator from the top, and the fine turbulence generator is used for finishing jet negative pressure to remove trace oil of emulsified particles cracked by an electric extinction cationic processor of the fine water purification device; swirling and re-coagulating by using a circular tank barrel to promote fine particles; in separating out oil gas from the last sewer drain admission liquid collecting tank of device, simultaneously:
23, turning the eddy water subjected to oil removal by fine turbulent air flotation and coagulation downwards to enter a fine filtering layer, and intercepting fine particles and fine oil droplets by fine filtering materials; then:
24, performing enhanced treatment of descaling, deoxidizing, sterilizing and inhibiting corrosion by the electron reduction method of the electric deionization cation processor on the outlet water after fine filtration; then:
and 25, treating the water reaching the standard by the water purifying device for reinjection or reuse in the oil field.
2. A combination device based on the shale oil and gas field produced water treatment method of claim 1 is characterized by comprising a gas-liquid collection tank, a VOCs treatment device, a lift pump, a first mixer, a deoiling device, a second mixer, a desliming device, a coarse purified water device, a fine purified water device, an air-entrapping device, a dosing device, a gas-oil-water separator, a slurry concentration and solidification device, a first material pump, a dosing tank, a second material pump and a backwashing pump;
the top of the gas-liquid collecting tank is provided with the VOCs treatment device, the top of the gas-liquid collecting tank is provided with a liquid pumping pipe orifice, and the lifting pump and the first mixer are arranged between the liquid pumping pipe orifice and the oil removal device;
the second mixer is arranged between the oil removing device and the mud removing device;
the mud removing device is communicated with the coarse purified water device, the fine purified water device and the fine purified water device through pipelines;
the gas filling device is used for adding gas into the oil removing device, the sludge removing device, the coarse water purifying device, the fine water purifying device and the fine water purifying device;
the medicine adding device is used for adding a medicine into fluid in the device;
the gas-oil-water separator is communicated with the gas-liquid collecting tank and the oil removing device;
the slurry concentration and solidification device is communicated with the gas-liquid collecting tank, the mud removing device, the coarse purified water device, the fine purified water device and the fine purified water device;
the first material pump is communicated with the coarse water purification device;
the second material pump is communicated with the fine water purifying device and the fine water purifying device;
the feeding pool is communicated with the first material pump and the second material pump;
the backwashing pump is communicated with the coarse water purifying device, the fine water purifying device and the fine water purifying device.
3. The combination device of the shale oil and gas field produced water treatment method according to claim 2, characterized in that the gas-liquid collection tank is a horizontal round tank or a rectangular tank, the included angle between the gas-liquid collection tank and the horizontal plane is 5-15 degrees, the upper part of the gas-liquid collection tank is provided with an air overflow port, and the air overflow port is communicated with the VOCs treatment device; the middle part of the gas-liquid collecting tank is provided with a gas-liquid inlet which is connected with a liquid inlet manifold; and the lower part of the gas-liquid collecting tank is provided with a liquid pumping pipe orifice which is connected with a liquid inlet pipe of the lifting pump.
4. The combination unit of the shale oil and gas field produced water treatment method according to claim 2, wherein the VOCs treatment device is a vertical round tank or a rectangular tank, the bottom of the VOCs treatment device is provided with a skirt, the skirt is positioned on an air overflow port of the gas-liquid collection tank, a tank body is positioned on the skirt, and the top of the tank body is provided with a breathing air pipe; a pore plate is arranged at the bottom in the tank body, a primary magnetic rod is arranged at the upper part of the pore plate, and iron-carbon micro-electrolysis filler is filled in the peripheral space of the primary magnetic rod; a secondary magnetic bar is arranged above the iron-carbon micro-electrolysis filler, and a magnet filter material is arranged in the peripheral space of the secondary magnetic bar; and a third-level magnetic rod is arranged above the magnet filter material, magnet powder is arranged in the peripheral space of the third-level magnetic rod, and a first electric deionization processor is arranged above the magnet powder.
5. The combination device of claim 2, wherein the first mixer and the second mixer have the same structure and comprise a vertical circular sleeve, a liquid inlet pipe is arranged on the tangent line of the bottom section of the outer pipe of the vertical circular sleeve, an exhaust pipe is arranged at the top of the vertical circular sleeve, liquid outlet pipes are arranged at the bottom of the vertical circular sleeve and at the center of the pipe, and a dual-purpose pipe for emptying and blowdown is arranged at the periphery of the liquid outlet pipe at the bottom of the vertical circular sleeve.
6. The combination device of claim 2, wherein the oil removal device is a vertical circular tank, the center of the bottom of the oil removal device is provided with a liquid outlet pipe connected with the liquid inlet pipe of the second mixer, the middle lower part of the tank barrel of the oil removal device is provided with a manhole, the top of the tank of the oil removal device is provided with a liquid inlet pipe connected with the liquid outlet pipe of the first mixer, the periphery of the liquid inlet pipe is provided with a first upper manhole, the shell ring of the first upper manhole is provided with an oil collecting pipe, the oil collecting pipe is connected with the liquid inlet pipe of the gas-oil-water separator, the middle upper part of the tank barrel of the oil removal device is provided with a gas filling pipe connected with the gas filling device gas supply pipe, the horizontal section above the wall opening of the gas filling pipe in the tank barrel of the oil removal device is provided with a micro-vortex generator, the center of the micro-vortex generator is provided with a turbulence generator, the liquid inlet pipe of the turbulence generator is connected with the liquid inlet pipe of the top of the tank, and the wall of the micro-vortex generator is provided with a second cationic ion generator.
7. The combination device for the treatment method of the produced water of the shale oil and gas field according to claim 2, characterized in that the mud removal device comprises a vertical circular tank, a cap type sedimentation cylinder is coaxially arranged in the vertical circular tank, a cylinder section is arranged at the center of the bottom of the vertical circular tank, a water outlet pipe is arranged at the center of the cylinder section, and the water outlet pipe extends upwards to the upper part of the cap type sedimentation cylinder; the water outlet pipe is connected with a water inlet pipe orifice of the coarse water purification device; a mud discharge pipe opening is formed in the side face of the shell ring and is connected with a mud inlet pipe of the mud concentration and solidification device; a first lower manhole is arranged on the periphery of a lower end socket on the shell ring; a liquid inlet pipe orifice is formed in the center of the top of the vertical round tank and connected with a liquid outlet pipe of a second mixer, and a plurality of medicine adding pipe orifices are formed in the liquid inlet pipe of the second mixer and connected with medicine adding pipes of the medicine adding device respectively; a second upper manhole is arranged on the periphery of a tank top liquid inlet pipe orifice of the vertical round tank, an operation sewage draining pipe orifice is arranged on the side wall of the second upper manhole, and the operation sewage draining pipe orifice is connected with the gas-liquid collecting tank liquid inlet pipe; a coalescence suspension ball is arranged between the outer wall of the cap type settling cylinder and the inner wall of the vertical circular tank, and a circular pore plate is arranged on the top of the cap type settling cylinder; the center of the upper surface of the circular orifice plate is provided with a turbulence generator, and a liquid inlet pipe of the turbulence generator is connected with a liquid inlet pipe orifice of the vertical circular tank.
8. The combination device for the treatment method of the produced water of the shale oil and gas field according to claim 2, characterized in that the coarse water purification device is a vertical circular tank, and the center of the bottom of the vertical circular tank is provided with a first dual-purpose nozzle for water outlet and backwashing and water inlet; the first water outlet and backwashing water inlet dual-purpose pipe orifice is connected with a water inlet pipe of the fine water purification device, and the first water outlet and backwashing water inlet dual-purpose pipe orifice is connected with a water outlet pipe of the backwashing pump; an air-entrapping pipe orifice is arranged on the water inlet pipe of the fine water purification device and is connected with an air supply pipe of the air-entrapping device; a second lower manhole is arranged at the periphery of the end socket of the first water outlet and backwashing water inlet dual-purpose pipe orifice, a lower sewage discharge pipe orifice is arranged at the periphery of the second lower manhole, and the lower sewage discharge pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank; a lower discharge pipe orifice is arranged at the lower part of the tank cylinder of the vertical circular tank and connected with a feed pipe of the first material pump, a first middle manhole is arranged in the middle of the tank cylinder of the vertical circular tank, a water inlet pipe orifice is arranged on the first middle manhole, the outside of the water inlet pipe orifice is connected with a water outlet pipe of the sludge removal device, and the inside of the water inlet pipe orifice is connected with a central vortex cylinder in a tangent line manner; a feeding pipe orifice is arranged on the upper side of the water inlet pipe orifice and is connected with a discharging pipe of the first material pump; a third electric deionization cation processor is arranged on the upper edge of the feeding pipe orifice, a backwashing sewage discharge pipe orifice is arranged in the center of the tank top of the vertical circular tank, a third upper manhole is arranged on the periphery of the backwashing sewage discharge pipe orifice of the tank top of the vertical circular tank, an operating sewage discharge pipe orifice is arranged on a third upper manhole shell ring, and the operating sewage discharge pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank; an annular lower sieve plate is arranged in an annular space below an in-tank lower discharge pipe of the vertical round tank, a vortex cylinder is arranged in the center of the annular lower sieve plate, coarse filter materials are arranged on the annular lower sieve plate, an annular upper sieve plate is arranged on a coarse filter material layer, and a third electronic cation elimination processor is arranged on the upper edge of the annular upper sieve plate; and a blow-down pipe orifice is arranged on the side surface of the tank bottom end socket of the vertical round tank and communicated with a liquid inlet pipe of the gas-liquid collecting tank.
9. The combination unit of claim 2, wherein the fine and refined water treatment unit is of the same construction and comprises a vertical circular tank, and the fine and refined water treatment unit shares the second material pump;
a second water outlet and backwashing water inlet dual-purpose pipe orifice is arranged at the center of the bottom of the vertical round tank, wherein the water outlet pipe orifice of the fine purification water device is connected with the water inlet pipe of the fine purification water device, and the second water outlet and backwashing water inlet dual-purpose pipe orifice is connected with the water outlet pipe of the backwashing pump; a third lower manhole is arranged on the periphery of the lower end socket above the second water outlet and backwashing water inlet dual-purpose pipe orifice; a fourth electric cation removing processor is arranged on the periphery of the lower portion of the tank cylinder of the vertical circular tank, a lower discharge pipe and a lower discharge pipe of the refined water purifying device are arranged on the fourth electric cation removing processor and connected in parallel with an inlet of the shared second material pump, a second middle manhole is arranged in the middle of the tank cylinder of the vertical circular tank, an upper feeding pipe is arranged on the second middle manhole, and the upper feeding pipe of the refined water purifying device are connected in parallel with an outlet of the shared second material pump;
the tank top of the vertical round tank is provided with a dual-purpose pipe orifice for water inlet and backwashing and sewage discharge, wherein the dual-purpose pipe orifice for water inlet and backwashing and sewage discharge is connected with a water outlet pipe of the coarse purification water device; the dual-purpose pipe orifice for water inlet and backwashing sewage discharge is connected with a liquid inlet pipe of the gas-liquid collecting tank; a fourth upper manhole is arranged at the periphery of the pipe orifice for water inlet and backwashing sewage discharge, an operation sewage discharge pipe orifice is arranged on a cylinder section of the fourth upper manhole, and the operation sewage discharge pipe orifice is connected with a liquid inlet pipe of the gas-liquid collecting tank; a lower sieve plate is arranged between the fourth electro-cation processor and the lower discharge hole of the fine water purifying device, a fine filter material is arranged on the lower sieve plate, an upper sieve plate is arranged above the fine filter material and the upper feed hole, a fine turbulence generator is arranged in the center of the upper surface of the upper sieve plate, and a liquid inlet pipe of the fine turbulence generator is connected with an inner opening of a water inlet and backwashing blowdown dual-purpose pipe orifice;
the liquid inlet pipe of the fine turbulence generator is connected with the inner opening of the dual-purpose pipe opening for water inlet and backwashing sewage discharge at the top of the fine purification water device;
the diameters of the turbulence generators of the fine water purifying device and the fine water purifying device are different, and the sizes of the apertures of the sieve plates and the particle sizes of the filter materials are different.
10. The combination unit of the shale oil and gas field produced water treatment method according to claim 2, wherein the gas-filling device comprises an air compressor, a nitrogen generator and a gas storage tank; the end of giving vent to anger of air compressor machine with the inlet end of nitrogen generator is connected, the gas outlet of nitrogen generator with the gas holder is linked together, the gas holder with deoiling device the desilting device coarse purification water installation fine purification water installation with the refined purification water installation is linked together.
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| CN202310019189.8A CN115872570A (en) | 2023-01-06 | 2023-01-06 | Shale oil and gas field produced water treatment method and combined device |
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| CN202310019189.8A CN115872570A (en) | 2023-01-06 | 2023-01-06 | Shale oil and gas field produced water treatment method and combined device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116282766A (en) * | 2023-05-04 | 2023-06-23 | 海南儋州雅惠科技有限公司 | Closed circulation back flushing method for filter |
| CN118388077A (en) * | 2024-05-08 | 2024-07-26 | 重庆地质矿产研究院 | Recovery device for shale gas flowback fracturing test and application method thereof |
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| CN118388077A (en) * | 2024-05-08 | 2024-07-26 | 重庆地质矿产研究院 | Recovery device for shale gas flowback fracturing test and application method thereof |
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