CN114658404B - Thickened oil thermal recovery steam injection device and method - Google Patents
Thickened oil thermal recovery steam injection device and method Download PDFInfo
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- CN114658404B CN114658404B CN202210481971.7A CN202210481971A CN114658404B CN 114658404 B CN114658404 B CN 114658404B CN 202210481971 A CN202210481971 A CN 202210481971A CN 114658404 B CN114658404 B CN 114658404B
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- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000002347 injection Methods 0.000 claims abstract description 67
- 239000007924 injection Substances 0.000 claims abstract description 67
- 230000000903 blocking effect Effects 0.000 claims abstract description 51
- 239000000446 fuel Substances 0.000 claims abstract description 6
- 238000001704 evaporation Methods 0.000 claims description 51
- 238000002485 combustion reaction Methods 0.000 claims description 49
- 239000007789 gas Substances 0.000 claims description 47
- 230000008020 evaporation Effects 0.000 claims description 44
- 238000001514 detection method Methods 0.000 claims description 6
- 239000002737 fuel gas Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 238000005192 partition Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 41
- 238000004891 communication Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Spray-Type Burners (AREA)
Abstract
The application discloses a thick oil thermal recovery steam injection device and a method, wherein the thick oil thermal recovery steam injection device comprises a first blocking piece, a second blocking piece and a steam generation mechanism; the steam generating mechanism comprises a shell, a plurality of partition plates, a water injection pipe, a plurality of water valves, a water injection pipe, a plurality of air valves, a fuel injection pipe, a plurality of fuel valves, a steam pipe and an ignition piece. The beneficial effects of the application are as follows: the first blocking piece and the second blocking piece are blocked at the upper end and the lower end of the target interval in the shaft, the steam generating mechanism is put into the shaft, steam generated by the steam generating mechanism is injected between the first blocking piece and the second blocking piece and then enters the target interval, and the steam generated by the steam generating mechanism is positioned in the shaft and can be directly injected into the target interval without long-distance transportation, so that the loss of heat in the transportation process can be reduced, the shaft can be prevented from being damaged due to cold and hot alternation, meanwhile, the shaft is not required to be made of special materials, and the production cost is reduced.
Description
Technical Field
The application relates to the technical field of thickened oil thermal recovery, in particular to a thickened oil thermal recovery steam injection device and a thickened oil thermal recovery steam injection method.
Background
The thick oil is crude oil with higher asphaltene and colloid content and higher viscosity. The world thick oil resources are very rich, and the thick oil, the super thick oil, the oil sand and the asphalt account for about 70 percent of the total amount of the global petroleum resources. The global heavy oil geological reserves are about 8150 hundred million tons. At present, more than 70 thick oil fields are found in 12 basins in China, and 40 hundred million tons of reserves are ascertained. The most reserves are Liaohe fields, then victory fields, kelamay fields and Henan fields in turn. The offshore thick oil is intensively distributed in the Bohai sea area, and the Bohai sea has ascertained that the crude oil geological reserves are 45 hundred million cubic meters, wherein 62 percent of the offshore thick oil is thick oil.
The thick oil has large viscosity and poor fluidity, and brings great difficulties to the whole development and refining process. In the exploitation stage, thick oil cannot be self-blown in general due to poor fluidity. For crude oil transportation, high viscosity thick oil transportation must be carried out by a high-power and stable-performance pumping device. In the case of a refinery process, in order to convert a thick oil into a fuel oil, a large amount of hydrogen is required to be added for a cracking reaction; residuum, sulfur, nitrogen, metallic elements, etc. can also greatly increase the difficulty of the refining process.
The research shows that the viscosity of the thick oil is very sensitive to the temperature, and the viscosity tends to be reduced by half when the temperature is increased by 10 ℃. Therefore, experts put forward a method for manually heating an oil layer, which is also a main idea for developing thick oil in the later industry. The steam huff and puff method is one of the methods, and the method for improving the fluidity of the thickened oil by injecting high-temperature steam into a shaft to heat the oil reservoir comprises the following specific steps: (1) steam generated by a steam generator at the surface is injected into the reservoir via the wellbore; (2) the well is braised, usually for 2 to 5 days; (3) and (5) well opening production. The steam injection amount and the soaking time are determined according to factors such as well depth, oil layer property, viscosity and the like.
Because of the need to inject high temperature and pressure steam (up to 350 ℃ C. And up to 17 megapascals pressure), steam throughput requires special materials, equipment and processes, large casings (typically over 7 inches, and casing wall thicknesses typically greater than 9 millimeters) are commonly used in production wells. At present, 80% of the domestic thick oil thermal recovery yield is obtained by a steam huff and puff process. When the high three-area oil well of the Liaohe oil field carries out the steam huff-puff test for the first time, 980 tons of steam are injected in a cumulative way, 58 days of self-injection are carried out, and 780 tons of oil is produced.
Steam throughput has the disadvantage; compared with foreign thick oil fields, the thick oil field has the advantages that the thick oil field is buried deeply (concentrated at 1000-1500 m), so that steam generated by a steam generator on the ground can reach a target gas injection layer section after being conveyed through a long-distance shaft, a large amount of heat energy can be consumed in the process, meanwhile, the whole shaft is required to be made of a shaft made of special materials, and the production cost is high.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a device and a method for thermal recovery and steam injection of thickened oil, which are used for solving the technical problems that the conventional steam huff-puff process needs long-distance shaft transportation of steam generated by a steam generator on the ground before the steam reaches a target gas injection interval, so that a great amount of heat is lost, the shaft is easy to damage and the production cost is high.
In order to achieve the above purpose, the application provides a thick oil thermal recovery steam injection device, which comprises a first blocking piece, a second blocking piece and a steam generation mechanism;
the first plugging piece is used for plugging in a shaft;
the second blocking piece is used for being blocked in the shaft and positioned above the first blocking piece, and an air inlet is formed in the second blocking piece;
the steam generating mechanism comprises a shell, a plurality of baffle plates, a water injection pipe, a plurality of water valves, a water injection pipe, a plurality of air valves, a water injection gas pipe, a plurality of gas valves, a steam pipe and ignition pieces, wherein the shell is provided with a cylindrical accommodating cavity, each baffle plate is arranged in the accommodating cavity along the length direction of the shell, the accommodating cavity is divided into a plurality of evaporation cavities and combustion cavities which are sequentially arranged at intervals along the length direction, the water injection pipe is communicated with a water source, a plurality of water injection ports are formed in the water injection pipe, the water injection ports are arranged in the evaporation cavities in a one-to-one mode, the water valves are arranged in the water injection ports in a one-to-one mode, the air injection pipes are communicated with outlets of the air compressor, a plurality of air inlets are formed in the air injection pipe in a one-to-one mode, the air inlets are arranged in the combustion cavities, the air valves are arranged in the air inlets in a one-to-one mode, the gas inlets are arranged in the air inlets in the one-to-one mode, the gas injection pipe is used for being communicated with the gas sources, the water injection pipe is provided with the evaporation cavities in a plurality of one-to one mode, the gas inlets are arranged in the one-to be communicated with the combustion cavities in one-to one mode, the ignition pieces are arranged in the same one-to the same number as the ignition pieces are arranged in the evaporation pipe.
In some embodiments, the first blocking member includes a first blocking block, a first air bag, and a first air pump, where the first blocking block is configured to be disposed in the wellbore, a first installation groove is formed on a side wall of the first blocking block, the first air bag is disposed in the first installation groove, and the first air pump is communicated with the first air bag.
In some embodiments, a steam cavity is further formed at the lower end of the shell, a steam outlet connector communicated with the steam cavity is formed on the lower end face of the shell, one end of the steam pipe is communicated with each evaporation cavity, the other end of the steam pipe is communicated with the steam cavity, and the steam outlet connector is used for being communicated with the air inlet.
In some embodiments, the second blocking member includes a second blocking block, a second air bag, and a second air pump, where the second blocking block is configured to be disposed in the wellbore, the air inlet is disposed on the second blocking block, a second mounting groove is disposed on a side wall of the second blocking block, the second air bag is disposed in the second mounting groove, and the second air pump is communicated with the second air bag.
In some embodiments, the second blocking member further comprises an air inlet connector and an in-place detection member, the air inlet connector is fixed at an air inlet end of the air inlet and is matched with the steam outlet connector, the in-place detection member comprises a first polar plate, a second polar plate, an elastic member and an alarm member, the first polar plate is fixed on the second blocking member, the second polar plate is located above the first polar plate, one end of the elastic member is fixedly connected with the first polar plate, the other end of the elastic member is fixedly connected with the second polar plate, the alarm member is electrically connected with the first polar plate and the second polar plate, and when the first polar plate is in butt joint with the second polar plate, the alarm member sends an alarm signal.
In some embodiments, the second closure further comprises an outlet fitting secured to the outlet end of the inlet.
In some embodiments, a liquid level detecting member is disposed in each of the evaporation chambers.
The application also provides a thickened oil thermal recovery gas injection method which is suitable for the thickened oil thermal recovery gas injection device, and comprises the following steps:
s1, perforating operation is carried out on a target interval needing thickened oil exploitation;
s2, a first plugging piece is put into the shaft, and is plugged below a target interval;
s3, a second plugging piece is put into the shaft, and is plugged above the target interval;
s4, putting the steam generating mechanism into the shaft, communicating a steam pipe of the steam generating mechanism with an air inlet of the second blocking piece, communicating the upper end of the water injection pipe with a water source on the ground, communicating the upper end of the fuel injection pipe with a fuel gas source on the ground, and communicating the upper end of the fuel injection pipe with an outlet of an air compressor on the ground;
s5, opening each water valve, each air valve and each gas valve, enabling water to enter each evaporation cavity through the water injection pipe, enabling gas and air to enter each combustion cavity, and simultaneously igniting through each ignition piece, so that the gas in each combustion cavity is combusted, the generated heat of combustion can heat the water in the adjacent evaporation cavity, enable the water to evaporate, and steam generated in each evaporation cavity enters between the first blocking piece and the second blocking piece in the shaft through the steam pipe and the air inlet and is injected into the target layer section.
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:
(1) The first blocking piece and the second blocking piece are blocked at the upper end and the lower end of a target layer section in the shaft, the steam generating mechanism is put into the shaft, steam generated by the steam generating mechanism is injected into the shaft section between the first blocking piece and the second blocking piece and then enters the target layer section, and the steam generated by the steam generating mechanism is positioned in the shaft, so that the steam can be directly injected into the target layer section without long-distance transportation, thereby not only reducing the loss of heat in the transportation process, but also avoiding the damage of the shaft due to cold and hot alternation, simultaneously, the shaft is not required to be made of special materials, and the production cost is reduced;
(2) According to the application, the plurality of evaporation cavities and the combustion cavities are sequentially arranged in the cylindrical shell at intervals along the length direction, so that the evaporation cavities and the combustion cavities are staggered to each other, and the heat exchange between the evaporation cavities and the combustion cavities is facilitated, so that on one hand, the utilization efficiency of heat generated by combustion in the combustion cavities can be improved, and meanwhile, the defects that the existing steam generator is large in volume and cannot be put into a shaft are overcome by arranging the multiple evaporation cavities and the multiple combustion cavities.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a thick oil thermal recovery steam injection device according to the present application;
FIG. 2 is a schematic cross-sectional view of the steam generating mechanism of FIG. 1;
FIG. 3 is a schematic view of the steam generating mechanism of FIG. 2;
FIG. 4 is a schematic perspective view of the first closure member of FIG. 1;
FIG. 5 is a schematic view of the first closure of FIG. 4;
FIG. 6 is a schematic perspective view of the second closure of FIG. 1;
FIG. 7 is a schematic view of the second closure of FIG. 6;
in the figure: 1-first block, 11-first block, 111-first mounting groove, 12-first bladder, 13-first air pump, 2-second block, 21-second block, 211-air inlet, 212-second mounting groove, 213-outlet fitting, 22-second bladder, 23-second air pump, 24-inlet fitting, 25-in-place detector, 251-first plate, 252-second plate, 253-elastic member, 3-steam generating mechanism, 31-housing, 311-evaporation chamber, 312-combustion chamber, 313-steam chamber, 314-outlet fitting, 32-partition, 33-water injection pipe, 331-water valve, 34-air injection pipe, 341-air valve, 35-air injection pipe, 351-air valve, 36-steam pipe, 361-opening, 37-ignition member, 4-wellbore, S1-first layer section, S2-second layer section, S3-third layer section, S4-target section, S5-fifth layer section.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
Referring to fig. 1-7, the present application provides a thick oil thermal recovery steam injection device and a thick oil thermal recovery method, comprising a first blocking member 1, a second blocking member 2 and a steam generating mechanism 3.
The first plug 1 is intended to be plugged into a wellbore 4. The second plugging member 2 is used for plugging the well bore 4 and is located above the first plugging member 1, and the second plugging member 2 is provided with an air inlet 211.
The steam generating mechanism 3 includes a housing 31, a plurality of partition plates 32, a water injection pipe 33, a plurality of water valves 331, a water injection pipe 34, a plurality of air valves 341, a water injection pipe 35, a plurality of gas valves 351, a steam pipe 36 and an ignition member 37, the housing 31 has a cylindrical accommodating cavity, the housing 31 is made of a heat insulating material, each partition plate 32 is disposed in the accommodating cavity along the length direction of the housing 31 so as to divide the accommodating cavity into a plurality of sequentially spaced evaporating cavities 311 and combustion cavities 312 (i.e., sequentially disposing the evaporating cavities 311, the combustion cavities 312, the evaporating cavities 311 and the combustion cavities 312 … … from top to bottom in order of each other, so that the evaporating cavities 311 and the combustion cavities 312 are staggered with each other to facilitate heat exchange between the evaporating cavities 311 and the combustion cavities 312), and the partition plates 32 are made of a material with good heat conductivity so that the evaporating cavities 311 and the adjacent combustion cavities 312 are conveniently heat exchanged.
The water injection pipe 33 is used for being communicated with a water source (a water source with pressure, such as a tap water pipe), a plurality of water injection ports are formed in the water injection pipe 33, the water injection ports are arranged in the evaporation cavities 311 in a one-to-one correspondence mode, the water valves 331 are arranged in the water injection ports in a one-to-one correspondence mode, the air injection pipe 34 is used for being communicated with an outlet of an air compressor (not shown), a plurality of air inlet ports are formed in the air injection pipe 34, the air inlet ports are arranged in the combustion cavities 312 in a one-to-one correspondence mode, the air valves 341 are arranged in the air inlet ports in a one-to-one correspondence mode, the gas injection pipes 35 are used for being communicated with a gas source (such as a natural gas pipeline), a plurality of gas inlet ports are formed in the gas injection pipes 35, the gas inlet ports are arranged in the combustion cavities 312 in a one-to-one correspondence mode, the gas valves 351 are arranged in the gas inlet cavities in a one-to-one correspondence mode, one end of the steam pipes 36 are communicated with the evaporation cavities 311, the other ends of the steam pipes 36 are used for being communicated with the air inlets 211, the air inlet ports 361 are in a one-to-one correspondence mode, the ignition cavities 37 are arranged in a one-to-one correspondence mode, and the ignition cavities 37 are arranged in the same in the combustion cavities 37, and the number of the ignition cavities 37 are in the same in one-to one correspondence mode, and the ignition cavities 37 are arranged with the ignition cavities are in the one-to be one and the same. It will be appreciated that in order to facilitate the evacuation of exhaust gases produced by combustion within the combustion chambers 312, the steam generating mechanism 3 further comprises an exhaust pipe (not shown) having a lower end in communication with each combustion chamber 312 and an upper end extending to the ground.
When the system is used, the stratum is provided with a first interval S1, a second interval S2, a third interval S3, a fourth interval (namely a target interval S4) and a fifth interval S5 from top to bottom in sequence, firstly, perforating operation is carried out on the target interval S4 needing thick oil exploitation, and then the first plugging piece 1 is lowered into the shaft 4 and plugged below the target interval S4; lowering the second plugging member 2 into the wellbore and plugging it above the target interval S4; lowering the steam generating mechanism 3 into the shaft 4, communicating the steam pipe 36 of the steam generating mechanism 3 with the air inlet 211 of the second plugging member 2, communicating the upper end of the water injection pipe 33 with a water source on the ground, communicating the upper end of the gas injection pipe 35 with a gas source on the ground, and communicating the upper end of the gas injection pipe 34 with an outlet of an air compressor on the ground; the water valves 331, 341 and 351 are opened to allow water to enter the evaporation chambers 311 through the water injection pipes 33, allow fuel gas and air to enter the combustion chambers 312, and simultaneously ignite through the ignition members 37, so that the fuel gas in the combustion chambers 312 is combusted, the generated heat of combustion can heat the water in the adjacent evaporation chambers 311 to convert the water into steam, and the steam generated in the evaporation chambers 311 enters between the first and second sealing members in the well bore 4 through the steam pipes 36 and the air inlets 211 and is injected into the target interval S4.
The beneficial effects of the application are as follows:
(1) The first plugging piece 1 and the second plugging piece 2 are plugged at the upper end and the lower end of the target interval S4 in the shaft 4, the steam generating mechanism 3 is put into the shaft 4, steam generated by the steam generating mechanism 3 is injected into the shaft section between the first plugging piece 1 and the second plugging piece 2 and then enters the target interval S4, and the steam generated by the steam generating mechanism 3 can be directly injected into the target interval S4 without long-distance transportation because the steam generating mechanism 3 is positioned in the shaft 4, so that the loss of heat in the transportation process can be reduced, the damage of the shaft 4 due to cold and hot alternation can be avoided, meanwhile, the shaft 4 is not required to be made of special materials, and the production cost is reduced;
(2) According to the application, the plurality of evaporation cavities 311 and the combustion cavities 312 are sequentially arranged in the cylindrical shell 31 at intervals along the length direction, so that the evaporation cavities 311 and the combustion cavities 312 are staggered, and the heat exchange between the evaporation cavities 311 and the combustion cavities 312 is facilitated, so that on one hand, the utilization efficiency of heat generated by combustion in the combustion cavities 312 can be improved, and meanwhile, the defects that the existing steam generator is large in size and cannot be put into a shaft 4 are overcome by arranging the multiple evaporation cavities 311 and the multiple combustion cavities 312.
In order to specifically implement the function of the first plugging member 1, please refer to fig. 1, 4 and 5, in a preferred embodiment, the first plugging member 1 includes a first plugging block 11, a first air pump 12 and a first air pump 13, the first plugging block 11 is configured to be disposed in the wellbore 4, a first installation groove 111 is formed on a side wall of the first plugging block 11, the first air pump 12 is disposed in the first installation groove 111, the first air pump 13 is communicated with the first air pump 12, and when in use, the first plugging block 11 is placed under a target stratum through a drill rod, and then air is injected into the first air pump 12 through the first air pump 13, so that the first air pump 12 is inflated and plugged in the wellbore 4.
In order to facilitate the communication between the steam pipe 36 and the air inlet 211, referring to fig. 1-3, in a preferred embodiment, a steam cavity 313 is further formed at the lower end of the housing 31, a steam outlet connector 314 that communicates with the steam cavity 313 is provided on the lower end surface of the housing 31, one end of the steam pipe 36 is communicated with each of the evaporation cavities 311, the other end of the steam pipe 36 is communicated with the steam cavity 313, the steam outlet connector 314 is used for communicating with the air inlet 211, and in use, the communication between the steam pipe 36 and the air inlet 211 can be achieved only by inserting the housing 31 into the wellbore 4 and docking the steam outlet connector 314 with the air inlet 211 on the second plugging block 21.
In order to specifically implement the function of the second blocking member 2, please refer to fig. 1, 6 and 7, in a preferred embodiment, the second blocking member 2 includes a second blocking member 21, a second air bag 22 and a second air pump 23, the second blocking member 21 is configured to be disposed in the wellbore 4, the air inlet 211 is disposed on the second blocking member 21, a second mounting groove 212 is disposed on a side wall of the second blocking member 21, the second air bag 22 is disposed in the second mounting groove 212, the second air pump 23 is in communication with the second air bag 22, and when in use, the second blocking member 21 is placed above the target stratum by a drill rod, and then air is injected into the second air bag 22 by the second air pump 23, so that the second air bag 22 is inflated and blocked in the wellbore 4.
In order to facilitate detecting whether the steam connector 314 is in position with the air inlet 211, referring to fig. 1, 2, 6 and 7, in a preferred embodiment, the second blocking member 2 further includes an air inlet connector 24 and an in-position detecting member 25, the air inlet connector 24 is fixed at an air inlet end of the air inlet 211 and is matched with the steam outlet connector, the in-position detecting member 25 includes a first plate 251, a second plate 252, an elastic member 253 and an alarm member (not shown), the first plate 251 is fixed on the second blocking member 21, the second plate 252 is located above the first plate 251, one end of the elastic member 253 is fixedly connected with the first plate 251, the other end of the elastic member 253 is fixedly connected with the second plate 252, the alarm member is electrically connected with both the first plate 251 and the second plate 252, and when the first plate 251 is abutted with the second plate 252, the alarm member emits an alarm signal. When the shell 31 is being put into, after the steam outlet connector 314 enters the air inlet connector 24, the steam outlet connector 314 abuts against the second polar plate 252, then the second polar plate 252 is pressed to move downwards, and when the first polar plate 251 abuts against the second polar plate 252, the alarm part sends out an alarm signal to indicate that the steam outlet connector 314 enters the air inlet connector 24 to be completely abutted, so that the shell 31 is stopped from being put into.
In order to facilitate the steam discharge, referring to fig. 1, 6 and 7, in a preferred embodiment, the second blocking member 21 further includes an air outlet connector 213, and the air outlet connector 213 is fixed to an air outlet end of the air inlet 211.
In order to prevent the situation of empty burning or water flooding in the evaporation chambers 311, referring to fig. 1-3, in a preferred embodiment, each evaporation chamber 311 is provided with a liquid level detecting member (not shown), when the liquid level detecting member detects that the water level in the evaporation chamber 311 is lower than a preset water level, the corresponding water valve 331 is opened, and when the water level detecting member detects that the water level in the evaporation chamber 311 is higher than the preset water level, the corresponding water valve 331 is closed, so that the water level in the evaporation chamber 311 is always kept at the preset water level, so as to prevent the situation of empty burning or water flooding.
The application also provides a thickened oil thermal recovery gas injection method which is suitable for the thickened oil thermal recovery gas injection device, and comprises the following steps:
s1, perforating operation is carried out on a target interval S4 needing thickened oil exploitation;
s2, the first plugging piece 1 is lowered into the shaft 4 and plugged below the target interval S4;
s3, the second plugging piece 2 is lowered into the shaft 4 and plugged above the target interval S4;
s4, the steam generating mechanism 3 is put into the shaft 4, the steam pipe 36 of the steam generating mechanism 3 is communicated with the air inlet 211 of the second plugging member 2, the upper end of the water injection pipe 33 is communicated with a water source on the ground, the upper end of the gas injection pipe 35 is communicated with a gas source on the ground, and the upper end of the gas injection pipe 34 is communicated with an outlet of an air compressor on the ground;
s5, opening each water valve 331, air valve 341 and gas valve 351 to enable water to enter each evaporation cavity 311 through the water injection pipe 33, enabling gas and air to enter each combustion cavity 312, and simultaneously igniting through each ignition piece 37, so that the gas in each combustion cavity 312 is combusted, the generated heat of combustion can heat the water in the adjacent evaporation cavity 311 to enable the water to evaporate, and steam generated in each evaporation cavity 311 enters between the first blocking piece 1 and the second blocking piece 2 in the shaft 4 through the steam pipe 36 and the air inlet 211 and is injected into the target interval S4.
In summary, the beneficial effects of the application are as follows:
(1) The first plugging piece 1 and the second plugging piece 2 are plugged at the upper end and the lower end of the target interval S4 in the shaft 4, the steam generating mechanism 3 is put into the shaft 4, steam generated by the steam generating mechanism 3 is injected into the shaft section between the first plugging piece 1 and the second plugging piece 2 and then enters the target interval S4, and the steam generated by the steam generating mechanism 3 can be directly injected into the target interval S4 without long-distance transportation because the steam generating mechanism 3 is positioned in the shaft 4, so that the loss of heat in the transportation process can be reduced, the damage of the shaft 4 due to cold and hot alternation can be avoided, meanwhile, the shaft 4 is not required to be made of special materials, and the production cost is reduced;
(2) According to the application, the plurality of evaporation cavities 311 and the combustion cavities 312 are sequentially arranged in the cylindrical shell 31 at intervals along the length direction, so that the evaporation cavities 311 and the combustion cavities 312 are staggered, and the heat exchange between the evaporation cavities 311 and the combustion cavities 312 is facilitated, so that on one hand, the utilization efficiency of heat generated by combustion in the combustion cavities 312 can be improved, and meanwhile, the defects that the existing steam generator is large in volume and cannot be put into a shaft 4 are overcome by arranging the multiple evaporation cavities 311 and the multiple combustion cavities 312;
(3) By arranging the in-place detection piece 25 on the second plugging block 21, whether the steam connector 314 is in-place in butt joint with the air inlet 211 or not can be detected, so that the steam generation mechanism 3 can be conveniently put in, and the use convenience of the thick oil thermal recovery steam injection device is greatly improved.
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be included in the scope of the present application.
Claims (8)
1. The thick oil thermal recovery steam injection device is characterized by comprising a first blocking piece, a second blocking piece and a steam generation mechanism;
the first plugging piece is used for plugging in a shaft;
the second blocking piece is used for being blocked in the shaft and positioned above the first blocking piece, and an air inlet is formed in the second blocking piece;
the steam generating mechanism comprises a shell, a plurality of baffle plates, a water injection pipe, a plurality of water valves, a water injection pipe, a plurality of air valves, a water injection gas pipe, a plurality of gas valves, a steam pipe and ignition pieces, wherein the shell is provided with a cylindrical accommodating cavity, each baffle plate is arranged in the accommodating cavity along the length direction of the shell, the accommodating cavity is divided into a plurality of evaporation cavities and combustion cavities which are sequentially arranged at intervals along the length direction, the water injection pipe is communicated with a water source, a plurality of water injection ports are formed in the water injection pipe, the water injection ports are arranged in the evaporation cavities in a one-to-one mode, the water valves are arranged in the water injection ports in a one-to-one mode, the air injection pipes are communicated with outlets of the air compressor, a plurality of air inlets are formed in the air injection pipe in a one-to-one mode, the air inlets are arranged in the combustion cavities, the air valves are arranged in the air inlets in a one-to-one mode, the gas inlets are arranged in the air inlets in the one-to-one mode, the gas injection pipe is used for being communicated with the gas sources, the water injection pipe is provided with the evaporation cavities in a plurality of one-to one mode, the gas inlets are arranged in the one-to be communicated with the combustion cavities in one-to one mode, the ignition pieces are arranged in the same one-to the same number as the ignition pieces are arranged in the evaporation pipe.
2. The thick oil thermal recovery steam injection device of claim 1, wherein the first plugging piece comprises a first plugging block, a first air bag and a first air pump, the first plugging block is arranged in a shaft, a first mounting groove is formed in the side wall of the first plugging block, the first air bag is arranged in the first mounting groove, and the first air pump is communicated with the first air bag.
3. The thick oil thermal recovery steam injection device of claim 1, wherein a steam cavity is further formed at the lower end of the shell, a steam outlet connector communicated with the steam cavity is formed on the lower end face of the shell, one end of the steam pipe is communicated with each evaporation cavity, the other end of the steam pipe is communicated with the steam cavity, and the steam outlet connector is used for being communicated with the air inlet.
4. The thick oil thermal recovery steam injection device of claim 3, wherein the second plugging piece comprises a second plugging block, a second air bag and a second air pump, the second plugging block is arranged in a shaft, the air inlet is formed in the second plugging block, a second mounting groove is formed in the side wall of the second plugging block, the second air bag is arranged in the second mounting groove, and the second air pump is communicated with the second air bag.
5. The thick oil thermal recovery steam injection device of claim 4, wherein the second plugging piece further comprises an air inlet connector and an in-place detection piece, the air inlet connector is fixed at the air inlet end of the air inlet and matched with the steam outlet connector, the in-place detection piece comprises a first polar plate, a second polar plate, an elastic piece and an alarm piece, the first polar plate is fixed on the second plugging piece, the second polar plate is positioned above the first polar plate, one end of the elastic piece is fixedly connected with the first polar plate, the other end of the elastic piece is fixedly connected with the second polar plate, the alarm piece is electrically connected with the first polar plate and the second polar plate, and when the first polar plate is in butt joint with the second polar plate, the alarm piece sends an alarm signal.
6. The thick oil thermal recovery steam injection apparatus of claim 4, wherein the second plugging member further comprises a gas outlet connector secured to a gas outlet end of the gas inlet.
7. The thick oil thermal recovery steam injection device of claim 1, wherein each evaporation cavity is internally provided with a liquid level detection member.
8. A thick oil thermal recovery gas injection method, which is suitable for the thick oil thermal recovery gas injection device as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
s1, perforating operation is carried out on a target interval needing thickened oil exploitation;
s2, a first plugging piece is put into the shaft, and is plugged below a target interval;
s3, a second plugging piece is put into the shaft, and is plugged above the target interval;
s4, putting the steam generating mechanism into the shaft, communicating a steam pipe of the steam generating mechanism with an air inlet of the second blocking piece, communicating the upper end of the water injection pipe with a water source on the ground, communicating the upper end of the fuel injection pipe with a fuel gas source on the ground, and communicating the upper end of the fuel injection pipe with an outlet of an air compressor on the ground;
s5, opening each water valve, each air valve and each gas valve, enabling water to enter each evaporation cavity through the water injection pipe, enabling gas and air to enter each combustion cavity, and simultaneously igniting through each ignition piece, so that the gas in each combustion cavity is combusted, the generated heat of combustion can heat the water in the adjacent evaporation cavity, enable the water to evaporate, and steam generated in each evaporation cavity enters between the first blocking piece and the second blocking piece in the shaft through the steam pipe and the air inlet and is injected into the target layer section.
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| CN202210481971.7A CN114658404B (en) | 2022-05-05 | 2022-05-05 | Thickened oil thermal recovery steam injection device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210481971.7A CN114658404B (en) | 2022-05-05 | 2022-05-05 | Thickened oil thermal recovery steam injection device and method |
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| CN114658404B true CN114658404B (en) | 2023-10-13 |
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| US4243098A (en) * | 1979-11-14 | 1981-01-06 | Thomas Meeks | Downhole steam apparatus |
| US4442898A (en) * | 1982-02-17 | 1984-04-17 | Trans-Texas Energy, Inc. | Downhole vapor generator |
| CN102282337A (en) * | 2009-01-16 | 2011-12-14 | 弗瑞德·施奈德 | Apparatus and method for downhole steam generation and enhanced oil recovery |
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| CN102472094A (en) * | 2009-07-17 | 2012-05-23 | 世界能源系统有限公司 | Method and apparatus for downhole gas generator |
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| US4243098A (en) * | 1979-11-14 | 1981-01-06 | Thomas Meeks | Downhole steam apparatus |
| US4442898A (en) * | 1982-02-17 | 1984-04-17 | Trans-Texas Energy, Inc. | Downhole vapor generator |
| CN102282337A (en) * | 2009-01-16 | 2011-12-14 | 弗瑞德·施奈德 | Apparatus and method for downhole steam generation and enhanced oil recovery |
| CN102472094A (en) * | 2009-07-17 | 2012-05-23 | 世界能源系统有限公司 | Method and apparatus for downhole gas generator |
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