CN116411848B - A pressure-controlled compensating exhaust system - Google Patents
A pressure-controlled compensating exhaust system Download PDFInfo
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- CN116411848B CN116411848B CN202111650699.2A CN202111650699A CN116411848B CN 116411848 B CN116411848 B CN 116411848B CN 202111650699 A CN202111650699 A CN 202111650699A CN 116411848 B CN116411848 B CN 116411848B
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- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/10—Formed core retaining or severing means
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- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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Abstract
本发明涉及石油、天然气勘探开发工具领域，公开了一种控压补偿排气系统，包括提升机构、差动机构和传动机构。提升机构包括提升接头和套筒组件，差动机构包括能够相对移动的差动加压杆和差动连接套。而传动机构连接于差动连接套，包括依次连接的分流注气接头、活塞压力接头和负压排气接头，活塞压力接头具有容置腔，容置腔内设置有活塞组件，活塞组件能够于容置腔内移动，并将容置腔分隔为高压气仓和导压仓，高压气仓能够被注入惰性气体，导压仓能够被注入钻井液。负压排气接头上设置有排气孔，负压排气接头能够被差动连接套带动并相对套筒组件移动，以使套筒组件关闭排气孔，而后利用传动机构为连接于负压排气接头上的取心内筒补压。
The present invention relates to the field of oil and gas exploration and development tools, and discloses a pressure-controlled compensating exhaust system, including a lifting mechanism, a differential mechanism and a transmission mechanism. The lifting mechanism includes a lifting joint and a sleeve assembly, and the differential mechanism includes a differential pressure rod and a differential connecting sleeve that can move relatively. The transmission mechanism is connected to the differential connecting sleeve, including a diverter gas injection joint, a piston pressure joint and a negative pressure exhaust joint that are connected in sequence. The piston pressure joint has a accommodating chamber, and a piston assembly is arranged in the accommodating chamber. The piston assembly can move in the accommodating chamber and divide the accommodating chamber into a high-pressure gas chamber and a pressure-conducting chamber. The high-pressure gas chamber can be injected with inert gas, and the pressure-conducting chamber can be injected with drilling fluid. An exhaust hole is arranged on the negative pressure exhaust joint, and the negative pressure exhaust joint can be driven by the differential connecting sleeve and move relative to the sleeve assembly, so that the sleeve assembly closes the exhaust hole, and then the transmission mechanism is used to supplement the pressure of the coring inner cylinder connected to the negative pressure exhaust joint.
Description
Technical Field
The invention relates to the field of petroleum and natural gas exploration and development tools, in particular to a pressure control compensation exhaust system.
Background
After the existing pressure-maintaining airtight coring tool is applied on site, the phenomena of low pressure-maintaining rate and damage to a crack structure after core testing exist, and the phenomena are mainly caused by the fact that air in the coring inner cylinder cannot be discharged, so that the temperature and the pressure of the coring inner cylinder are reduced in the process of coring. The existing pressure-maintaining airtight coring tool with pressure compensation cannot stably and accurately perform pressure compensation on the coring inner cylinder, and the excessive or insufficient pressure compensation can damage the original physical property section of the core. Specifically, the existing pressure control compensation device conducts pressure by directly or indirectly acting on the coring inner cylinder through a communicating sliding sleeve. The gas pressure value of the injection pressure air chamber is set only by calculating the hydrostatic column pressure value as a standard, and the pressure is fixed without a subsequent supplementing function, generally larger than the bottom hole pressure value, or the maximum limit pressure value in a safety range is set, so that the pressure cannot be scientifically compensated to cope with the complex change of the stratum pressure and the conditions of temperature and pressure change in the process of lifting the drill. In addition, because a certain amount of air exists in the coring inner cylinder, the compression ratio of the gas is large, the pressure compensation is directly carried out on the coring inner cylinder through the gas, the pressure compensation effect is unstable due to factors such as the length of a core in the coring inner cylinder, the gas-liquid mixing ratio and the like, the pressure compensation is easy to be too large or too low, and the physical property of the core under the original stratum pressure state cannot be maintained. If the current bottom hole pressure is large, the pressure value of the injected gas is also increased, the opening force for pushing the sliding sleeve is huge, the requirements on the material strength of the communicating sliding sleeve and the pushing part are strict, and the communicating sliding sleeve is failed to be pushed.
Therefore, a pressure-controlled compensating exhaust system is needed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a pressure-control compensation exhaust system, which not only can utilize liquid to automatically carry out accurate pressure compensation on a coring inner cylinder according to the current well depth pressure, but also can exhaust air of the coring inner cylinder, and further protect physical properties of a core under the original bottom layer stress
The technical scheme adopted by the invention is as follows:
A pressure-controlled compensated exhaust system, comprising:
The lifting mechanism comprises a lifting joint and a sleeve assembly, the sleeve assembly comprises a linkage pushing barrel, one end of the lifting joint penetrates through the linkage pushing barrel, and the positions of the lifting joint and the linkage pushing barrel are relatively fixed;
The differential mechanism is arranged in the linkage pushing cylinder and comprises a differential pressurizing rod and a differential connecting sleeve which are communicated with each other, the differential pressurizing rod is communicated with the lifting joint, the positions of the differential pressurizing rod and the lifting joint are relatively fixed, and the differential connecting sleeve can move relative to the differential pressurizing rod;
The transmission mechanism is arranged in the linkage pushing cylinder and connected with the differential connecting sleeve, the transmission mechanism comprises a split-flow gas injection joint, a piston pressure joint and a negative pressure gas discharge joint which are sequentially connected, the piston pressure joint is provided with a containing cavity, a piston assembly is arranged in the containing cavity and can move in the containing cavity, the containing cavity is divided into a high-pressure gas bin and a pressure guide bin, the high-pressure gas bin can be filled with inert gas, and the pressure guide bin can be filled with drilling fluid;
The negative pressure exhaust joint is provided with an exhaust hole, the negative pressure exhaust joint can be driven by the differential connecting sleeve and moves relative to the sleeve assembly, so that the sleeve assembly can open or close the exhaust hole, one end of the negative pressure exhaust joint is communicated with the pressure guide bin through a main negative pressure valve, the other end of the negative pressure exhaust joint is communicated with the coring inner barrel, and when the exhaust hole is closed and the pressure of the coring inner barrel is smaller than the pressure in the high pressure gas bin, the transmission mechanism can supplement pressure for the coring inner barrel.
As a preferable scheme of the pressure control compensation exhaust system, one end of the differential pressurizing rod is connected with the lifting joint in a sealing way, the other end of the differential pressurizing rod is provided with a sealing part, the differential connecting sleeve is connected with the split gas injection joint and surrounds the split gas injection joint to form a cavity, the sealing part is positioned in the cavity and divides the cavity into a differential cavity and a split cavity, the sealing part is in sealing butt joint with the inner wall of the cavity, and the differential connecting sleeve can move relative to the sealing part so as to change the sizes of the differential cavity and the split cavity.
As a preferable scheme of the pressure control compensation exhaust system, the differential pressurizing rod is provided with a first through hole along the axial direction of the differential pressurizing rod, the differential pressurizing rod is provided with a second through hole along the radial direction of the differential pressurizing rod, the second hole is communicated with the first hole, the first hole and the second hole are jointly used for communicating the lifting joint and the differential cavity, and the first hole is used for communicating the lifting joint and the shunt cavity.
As a preferable scheme of the pressure control compensation exhaust system, a differential hole is arranged in the circumferential direction of the differential connecting sleeve, the drilling fluid entering the differential cavity through the second hole can flow out of the transmission mechanism through the differential hole.
As a preferable scheme of the pressure control compensation exhaust system, a diversion hole is formed in the circumference of the diversion gas injection joint, the drilling fluid entering the diversion cavity through the first hole can flow out of the transmission mechanism through the diversion hole.
As a preferred scheme of the pressure control compensation exhaust system, the pressure control compensation exhaust system further comprises a blocking piece, wherein the blocking piece is used for blocking the first hole so as to block communication between the lifting joint and the diversion cavity.
As a preferable scheme of the pressure control compensation exhaust system, a side negative pressure valve is arranged in the circumferential direction of the piston pressure joint, and the drilling fluid outside the transmission mechanism can enter the pressure guide bin through the side negative pressure valve.
As a preferable scheme of the pressure control compensation exhaust system, the sleeve assembly further comprises a sealing sliding sleeve, the sealing sliding sleeve is sleeved on the negative pressure exhaust joint, and the sealing sliding sleeve can slide relative to the negative pressure exhaust joint through abutting the linkage pushing cylinder to close the exhaust hole.
As a preferred scheme of accuse pressure compensation exhaust system, the piston subassembly includes piston, spring and spring holder, the spring holder set up in the pressure guide storehouse, the one end cover of spring is located the spring holder, the other end cover of spring is located the piston, the spring can be used for adjusting the relative position of piston with the spring holder is in order to balance the high-pressure gas storehouse with the pressure of pressure guide storehouse.
As a preferable scheme of the pressure control compensation exhaust system, an air injection valve is arranged in the circumferential direction of the split air injection joint, an air injection channel which is communicated with the air injection valve and the high-pressure air bin is further arranged on the split air injection joint, and the air injection valve and the air injection channel are used for injecting inert gas into the high-pressure air bin.
The beneficial effects of the invention are as follows:
The pressure control compensation exhaust system provided by the invention comprises a lifting mechanism, a differential mechanism and a transmission mechanism. The lifting mechanism comprises a lifting joint and a sleeve assembly, the sleeve assembly comprises a linkage pushing barrel, one end of the lifting joint penetrates through the linkage pushing barrel, and the lifting joint and the position of the linkage pushing barrel are relatively fixed. The differential mechanism and the transmission mechanism are both arranged in the linkage pushing cylinder, the differential mechanism comprises a differential pressurizing rod and a differential connecting sleeve, the differential pressurizing rod is connected with the lifting joint, and the differential connecting sleeve is connected with the differential pressurizing rod and can move relative to the differential pressurizing rod. The transmission mechanism comprises a split-flow gas injection joint, a piston pressure joint and a negative pressure exhaust joint which are sequentially connected, and the split-flow gas injection joint is connected to the differential connecting sleeve. Namely, the positions of the lifting joint, the linkage pushing cylinder and the differential pressurizing rod are relatively fixed, and the positions of the differential connecting sleeve and the transmission mechanism are relatively fixed.
The piston pressure connector is provided with a containing cavity, a piston assembly is arranged in the containing cavity, the piston assembly can divide the containing cavity into a high-pressure gas bin and a pressure guide bin, the high-pressure gas bin can be filled with inert gas, the pressure guide bin can be filled with drilling fluid, and the piston assembly can move in the containing cavity along with continuous change of pressure in the process of running or tripping a well so as to compress the drilling fluid in the pressure guide bin or the inert gas in the high-pressure gas bin. Specifically, the pressure guiding bin is communicated with one end of the negative pressure exhaust joint through the main negative pressure valve, and the other end of the negative pressure exhaust joint is communicated with the coring inner barrel, namely the pressure of the negative pressure exhaust joint and the coring inner barrel is kept consistent. In the process of drilling, when the pressure of the coring inner cylinder is reduced due to the influence of temperature, the piston assembly moves towards the direction close to the pressure guide bin, and drilling fluid in the pressure guide bin is compressed to the coring inner cylinder through the main negative pressure valve, so that pressure conduction is carried out, and the pressure of the coring inner cylinder is improved. And at the moment, no gas exists in the pressure guide bin and the coring inner cylinder, and the piston assembly is used for compressing liquid to perform pressure control compensation, so that the pressure control compensation effect of the bottom hole pressure can be maximally close because the liquid compression ratio is small.
Drawings
Fig. 1 is a schematic structural diagram (a first use state) of a pressure-controlled compensation exhaust system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram (second use state) of a pressure-controlled compensation exhaust system according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a differential connecting sleeve according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a linkage push cylinder according to an embodiment of the present invention.
In the figure:
1. lifting the joint;
2. a sleeve assembly; 21, a linkage pushing cylinder 22, a sealing sliding sleeve;
3. differential pressurizing rod, 31, sealing part, 32, first hole, 33, second hole;
4. Differential connecting sleeve 41, differential hole;
5. the split-flow gas injection joint, 51, split-flow holes, 52, gas injection valves, 53, gas injection channels;
6. A piston pressure joint 61, a side negative pressure valve;
7. a negative pressure exhaust joint; 71, a main negative pressure valve 72, an exhaust hole;
8. 81 parts of piston assembly, 82 parts of piston, 82 parts of spring, 83 parts of spring seat;
9. A blocking member;
10. Differential cavity, 20 parts of split cavity, 30 parts of high-pressure air bin, 40 parts of pressure guiding bin, 50 parts of exhaust bin.
Detailed Description
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the invention is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
In order to avoid the pressure change caused by the temperature influence of the core in the process of taking off the drill, the influence of the overburden pressure, the net overburden pressure and the pore pressure on the accurate measurement of the core permeability is avoided, so that the core can keep stable overburden pressure and pore pressure balance under the bottom hole pressure state, and the accuracy and precision of core measurement are improved. The embodiment provides a accuse pressure compensation exhaust system, not only can utilize liquid to implement accurate pressure filling to the inner core barrel of taking core according to current well depth pressure is automatic, makes the pressure of inner core barrel of taking core be close the pressure at the bottom of the well all the time, can also empty the air of inner core barrel of taking core, reduces the pressure loss that the gas of high compression ratio caused, further protects the physical property under the original bottom stress of rock core.
As shown in fig. 1 to 4, the pressure-controlled compensating exhaust system includes a lifting mechanism, a differential mechanism, and a transmission mechanism. The lifting mechanism comprises a lifting joint 1 and a sleeve assembly 2, the sleeve assembly 2 comprises a linkage push cylinder 21, one end of the lifting joint 1 penetrates through the linkage push cylinder 21, and the positions of the lifting joint 1 and the linkage push cylinder 21 are relatively fixed. The differential mechanism and the transmission mechanism are both arranged in the linkage pushing cylinder 21, the differential mechanism comprises a differential pressurizing rod 3 and a differential connecting sleeve 4, the differential connecting sleeve 4 is connected with the differential pressurizing rod 3, the differential pressurizing rod 3 is connected with the lifting joint 1, the transmission mechanism comprises a split-flow gas injection joint 5, a piston pressure joint 6 and a negative pressure gas discharge joint 7 which are sequentially connected, and the split-flow gas injection joint 5 is connected with the differential connecting sleeve 4. Optionally, the linkage pusher 21 is screwed with the lifting joint 1. Optionally, the split-flow gas injection joint 5 is screwed with the differential connection sleeve 4. Optionally, the differential pressurizing rod 3 is screwed and sealed with the lifting joint 1. Optionally, the split gas injection fitting 5 is screwed and sealed to the piston pressure fitting 6. When the differential connection sleeve 4 moves relative to the differential pressurizing rod 3, the transmission mechanism connected to the differential connection sleeve 4 can move relative to the differential pressurizing rod 3, that is, in this embodiment, the positions of the lifting joint 1, the linkage push cylinder 21 and the differential pressurizing rod 3 are relatively fixed, and the positions of the differential connection sleeve 4 and the transmission mechanism are relatively fixed. And how the movement of the differential connection sleeve 4 relative to the differential pressurizing rod 3 is achieved will be described in detail below.
The piston pressure joint 6 is provided with a containing cavity, a piston assembly 8 is arranged in the containing cavity, the piston assembly 8 can divide the containing cavity into a high-pressure gas bin 30 and a pressure guide bin 40, the high-pressure gas bin 30 is positioned above the pressure guide bin 40 in the well descending process, the high-pressure gas bin 30 can be filled with inert gas, the pressure guide bin 40 can be filled with drilling fluid, the piston assembly 8 can move in the containing cavity, and the drilling fluid in the pressure guide bin 40 or the inert gas in the high-pressure gas bin 30 is compressed. Specifically, the pressure guiding chamber 40 is communicated with one end of the negative pressure exhaust joint 7 through the main negative pressure valve 71, and the other end of the negative pressure exhaust joint 7 is communicated with the coring inner cylinder (not shown in the figure), so that the negative pressure exhaust joint 7 can keep consistent with the pressure of the coring inner cylinder. During the process of tripping, when the pressure of the coring inner barrel is reduced due to the influence of temperature, the piston assembly 8 moves towards the direction approaching the pressure guiding bin 40, and the drilling fluid in the pressure guiding bin 40 is compressed to the coring inner barrel through the main negative pressure valve 71, so that the pressure conduction is performed, and the pressure of the coring inner barrel is increased. At this time, no gas exists in the pressure guide bin 40 and the coring inner barrel, and the piston assembly 8 is used for compressing drilling fluid to perform pressure control compensation, so that the pressure control compensation effect of the bottom hole pressure can be maximally close because the compression ratio of the fluid is small.
In this embodiment, the negative pressure exhaust joint 7 has an exhaust bin 50, and the coring inner cylinder is disposed in the negative pressure exhaust joint 7 in a penetrating manner and is communicated with the exhaust bin 50, that is, the exhaust bin 50 and the coring inner cylinder have the same pressure. As described above, when the pressure of the core barrel is gradually reduced, that is, the pressure of the exhaust chamber 50 is smaller than the pressure of the high-pressure air chamber 30, the piston assembly 8 moves to the side close to the negative pressure exhaust joint 7 in the accommodating chamber, so as to conduct pressure through the main negative pressure valve 71 in the pressure guiding chamber 40, and supplement the pressure of the core barrel.
Optionally, the exhaust hole 72 arranged on the negative pressure exhaust joint 7 is used for exhausting the air in the exhaust bin 50 and the coring inner barrel, so that the core in the coring inner barrel can be completely wrapped by the drilling fluid only by exhausting the air in the coring inner barrel in the coring process and reducing factors greatly influenced by temperature change, thereby laying a foundation for accurate pressure control compensation in the later stage. In the subsequent tripping process, the vent hole 72 needs to be plugged again to maintain pressure. In this embodiment, the opening or closing of the vent hole 72 is achieved by the sleeve assembly 2.
Specifically, the sleeve assembly 2 further includes a sealing sleeve 22, the sealing sleeve 22 is sleeved on the negative pressure exhaust joint 7, and before the coring operation starts, the exhaust hole 72 is in an open state, that is, the sealing sleeve 22 should avoid the exhaust hole 72, and only during the process of drilling, the exhaust hole 72 needs to be closed. As shown in fig. 1 and 2, the exhaust hole 72 is disposed in the circumferential direction of the negative pressure exhaust joint 7, the negative pressure exhaust joint 7 is connected to the differential connection sleeve 4, when the differential connection sleeve 4 moves relative to the differential pressurizing rod 3, the negative pressure exhaust joint 7 drives the sealing sliding sleeve 22 sleeved on the negative pressure exhaust joint 7 to move upwards, until the sealing sliding sleeve 22 abuts against the linkage pushing cylinder 21, the movement of the sealing sliding sleeve 22 is limited, at this moment, the negative pressure exhaust joint 7 continues to move upwards, the positions of the negative pressure exhaust joint 7 and the sealing sliding sleeve 22 change, so that the exhaust hole 72 is plugged, and the exhaust hole 72 is closed.
As shown in fig. 1 and 2, one end of the differential pressurizing rod 3 is connected to the lifting joint 1, the other end is connected to the differential connecting sleeve 4, and one end of the differential connecting sleeve 4, which is not connected to the differential pressurizing rod 3, is connected to the split gas injection joint 5 and encloses a cavity. Further, the other end of the differential pressurizing rod 3 has a sealing portion 31, the sealing portion 31 extends into the cavity and divides the cavity into the differential chamber 10 and the shunt chamber 20, and the sealing portion 31 is movable in the cavity, that is, the sizes of the differential chamber 10 and the shunt chamber 20 are changeable. Optionally, a through hole is formed on the differential connecting sleeve 4, and when the differential connecting sleeve is assembled, one end of the differential pressurizing rod 3 extends out of the cavity through the through hole to clamp the sealing part 31 in the cavity, the differential pressurizing rod 3 is in sealing connection with the differential connecting sleeve 4, and a sealing ring is clamped between the sealing part 31 and the inner wall of the cavity. Optionally, a sealing ring is also clamped between the wall of the through hole and the differential pressurizing rod 3. Optionally, a sealing ring is also clamped between the differential pressurizing rod 3 and the lifting joint 1.
Further, the differential pressurizing rod 3 is provided with a first hole 32 penetrating in the axial direction thereof, and a second hole 33 penetrating in the radial direction thereof, and the second hole 33 communicates with the first hole 32, and the lifting joint 1 can communicate with the differential chamber 10 through the first hole 32 and the second hole 33, or can communicate with the shunt chamber 20 only through the first hole 32. The sealing connection between the above parts is to ensure that the diversion cavity 20 and the differential cavity 10 are not communicated, so that the drilling fluid can enter the diversion cavity 20 or the differential cavity 10 from the lifting joint 1 according to a preset channel. As shown in fig. 1 and 2, the first hole 32 is perforated in the axial direction of the differential pressurizing rod 3, and this direction is also the direction of the running of the coring tool, so that in the case where both the first hole 32 and the second hole 33 are open, the drilling fluid will preferentially enter the diversion chamber 20 through the first hole 32. Preferably, the diameter of the first hole 32 is much larger than the diameter of the second hole 33. However, if the communication between the first hole 32 and the diversion chamber 20 is blocked, the drilling fluid can only enter the differential chamber 10, and as the drilling fluid in the differential chamber 10 increases, the differential connection sleeve 4 is driven to move relative to the differential pressurizing rod 3 by the rising of the pressure in the differential chamber 10. It can be seen that when the drilling fluid in the differential cavity 10 increases continuously, the differential connection sleeve 4 moves to one side of the lifting joint 1 to increase the volume of the differential cavity 10, that is, each part of the transmission mechanism moves to one side of the lifting joint 1, so that the exhaust hole 72 provided on the negative pressure exhaust joint 7 is blocked by the sealing sliding sleeve 22. Optionally, a plurality of second holes 33 are provided, and the plurality of second holes 33 are distributed at intervals along the circumferential direction of the differential pressurizing rod 3 to ensure the liquid feeding speed of the differential cavity 10.
Optionally, the pressure control compensating vent system further comprises a blocking member 9, i.e. a member for blocking communication between the first bore 32 and the shunt chamber 20. In this embodiment, the blocking member 9 is a steel ball, the diameter of which is adapted to the diameter of the first hole 32. After the coring is finished, the steel ball is thrown into the first hole 32, so that the drilling fluid cannot enter the diversion cavity 20 through the first hole 32 and continuously enters the differential cavity 10, and the action that the transmission mechanism moves relative to the linkage push cylinder 21 is completed. The blocking member 9 is placed in the first hole 32 so as not to obstruct the communication between the second hole 33 and the differential chamber 10, i.e., there is at least one gap between the first hole 32 and the second hole 33 in the axial direction of the differential pressurizing rod 3.
Further, the liquid inlet of the differential cavity 10 should be kept in dynamic balance, the volume of the differential cavity 10 has a maximum value, as shown in fig. 3, the differential connecting sleeve 4 is circumferentially provided with a differential hole 41, and as the differential connecting sleeve 4 moves towards the lifting joint 1, the differential hole 41 will gradually approach the differential pressurizing rod 3 until communicating with the second hole 33. Optionally, the number and positions of the differential holes 41 correspond to the number and positions of the second holes 33, i.e. it is ensured that each differential hole 41 is able to coincide with a corresponding second hole 33 when the differential connection sleeve 4 is moved in the axial direction of the differential connection rod, at which time the drilling fluid flowing into the differential cavity 10 through the second hole 33 will flow out of the transmission mechanism again from the differential holes 41.
Similarly, the diverter hole 51 is also provided in the circumferential direction of the diverter gas injection sub 5, and after drilling fluid enters the diverter chamber 20 through the first bore 32, the drilling fluid will flow out of the diverter hole 51 from the transmission mechanism. Optionally, the diverting holes 51 are provided in plurality. The main purpose of the above-mentioned circulation of drilling fluid is to keep the vent hole 72 open during the drilling process, i.e. after the steel ball is put into the drill, but not when the steel ball is put into the drill.
However, the drilling fluid enters the pressure guiding chamber 40 according to the change of the bottom hole pressure, optionally, a side negative pressure valve 61 is arranged in the circumferential direction of the piston pressure joint 6, and when the pressure in the pressure guiding chamber 40 is smaller than the bottom hole pressure, the drilling fluid between the transmission mechanism and the inner wall of the linkage push cylinder 21 can enter the pressure guiding chamber 40 through the side negative pressure valve 61, so that the pressure difference between the pressure guiding chamber 40 and the high pressure gas chamber 30 is in a preset difference range. Optionally, as shown in fig. 4, a hole is formed on a side wall of the linkage pushing cylinder 21, and during the well descending process, the drilling fluid can enter the linkage pushing cylinder 21, so that the drilling fluid can flow in the transmission mechanism more quickly.
The pressure difference between the pressure guide chamber 40 and the high-pressure gas chamber 30 is due to the piston assembly 8 disposed in the receiving chamber. As shown in fig. 3, in the present embodiment, the piston assembly 8 includes a piston 81, a spring 82 and a spring seat 83, the spring seat 83 is disposed in the pressure guiding chamber 40, one end of the spring 82 is sleeved on the spring seat 83, the other end of the spring 82 is sleeved on the piston 81, the spring seat 83 and the inner wall of the pressure guiding chamber 40 are relatively fixed, and the piston 81 can move in the pressure guiding chamber 40 to balance the pressure of the high-pressure gas chamber 30 and the pressure guiding chamber 40. Specifically, as can be seen from the foregoing, the pressure guiding chamber 40 can be filled with drilling fluid through the side negative pressure valve 61 to maintain a pressure consistent with the bottom hole, so when the bottom hole pressure is higher than the pressure in the high pressure gas chamber 30, the piston 81 will move to the side close to the split gas injection joint 5 until the pressure in the high pressure gas chamber 30 is balanced with the pressure in the pressure guiding chamber 40, but the pressure in the high pressure gas chamber 30 will be slightly higher than the current bottom hole pressure because the piston 81 is driven by the spring 82 to have a certain force on the high pressure gas.
In addition, because the bottom hole pressure is far greater than the atmospheric pressure, in order to make the pressure guiding bin 40 always have a pressure value consistent with the bottom hole pressure in the process of drilling, before the coring operation starts, inert gas slightly smaller than the current well depth hydrostatic column pressure value should be injected into the high pressure gas bin 30, and the piston 81 is pushed to the bottom of the accommodating cavity, namely, the spring 82 is compressed so that the piston 81 is close to the spring seat 83. During the down hole process, drilling fluid will continuously enter the pressure guiding chamber 40 as the pressure increases, so that the piston 81 moves upwards. When the coring is finished, the pressure guiding bin 40, the coring inner barrel and the bottom hole pressure are consistent, and at the moment, the steel balls are thrown in, the differential connecting sleeve 4 moves upwards, and the exhaust hole 72 is closed. During the process of tripping, the pressure of the coring inner cylinder is reduced under the influence of temperature, and the high-pressure gas chamber 30 pushes the piston 81 to move downwards until the pressure in the high-pressure gas chamber 30 is balanced with the pressure in the pressure guide chamber 40. That is, the drilling fluid in the pressure guiding bin 40 is compressed at this time to perform pressure control compensation on the coring inner barrel, so that the pressure of the coring inner barrel is consistent with the bottom hole pressure, and the gas in the coring inner barrel is removed at this time, so that the drilling fluid can fully wrap the core in the coring inner barrel.
Optionally, the split-flow gas injection joint 5 is circumferentially provided with a gas injection valve 52, and the split-flow gas injection joint 5 is further provided with a gas injection channel 53 communicating the gas injection valve 52 with the high-pressure gas chamber 30, that is, a worker can inject inert gas into the high-pressure gas chamber 30 by using the gas injection valve 52 and the gas injection channel 53. Alternatively, the gas injection valves 52 may be provided in plural, and the plural gas injection valves 52 may communicate with one gas injection passage 53. In addition, because the transmission mechanism is arranged in the linkage pushing cylinder 21, during assembly, inert gas with a pressure slightly smaller than the current well depth hydrostatic column pressure value is injected into the high-pressure gas cabin 30 through the gas injection valve 52, and then the linkage pushing cylinder 21 is assembled. In this embodiment, nitrogen may be used as the inert gas.
Before the coring operation starts, the pressure guiding chamber 40 is filled with water, and then the water injected before the drilling fluid enters the pressure guiding chamber 40 is discharged, and then the drilling fluid is compressed and flows. Alternatively, to secure the volume of the pressure guide chamber 40, as shown in fig. 1 and 2, the spring seat 83 has a columnar structure, and the spring seat 83 has a certain thickness along the axial direction thereof and is provided with a through hole along the axial direction thereof. The piston 81 includes a piston body and a protrusion extending toward the spring seat 83, and the protrusion is also provided with a hole to increase the accommodating space of the pressure guiding chamber 40.
The above embodiments merely illustrate the basic principle and features of the present invention, and the present invention is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A pressure-controlled compensating exhaust system, comprising:
The lifting mechanism comprises a lifting joint (1) and a sleeve assembly (2), the sleeve assembly (2) comprises a linkage pushing cylinder (21), one end of the lifting joint (1) penetrates through the linkage pushing cylinder (21), and the positions of the lifting joint (1) and the linkage pushing cylinder (21) are relatively fixed;
The differential mechanism is arranged in the linkage pushing cylinder (21) and comprises a differential pressurizing rod (3) and a differential connecting sleeve (4) which are communicated, the differential pressurizing rod (3) is communicated with the lifting joint (1), the positions of the differential pressurizing rod (3) and the lifting joint (1) are relatively fixed, and the differential connecting sleeve (4) can move relative to the differential pressurizing rod (3);
The transmission mechanism is arranged in the linkage pushing cylinder (21) and connected with the differential connecting sleeve (4), the transmission mechanism comprises a split-flow gas injection joint (5), a piston pressure joint (6) and a negative pressure gas discharge joint (7) which are sequentially connected, the piston pressure joint (6) is provided with a containing cavity, a piston assembly (8) is arranged in the containing cavity, the piston assembly (8) can move in the containing cavity and divide the containing cavity into a high-pressure gas bin (30) and a pressure guide bin (40), the high-pressure gas bin (30) can be filled with inert gas, and the pressure guide bin (40) can be filled with drilling fluid;
The negative pressure exhaust joint (7) is provided with an exhaust hole (72), the negative pressure exhaust joint (7) can be driven by the differential connecting sleeve (4) and moves relative to the sleeve assembly (2), so that the sleeve assembly (2) can be opened or closed the exhaust hole (72), one end of the negative pressure exhaust joint (7) is communicated with the pressure guide bin (40) through a main negative pressure valve (71), the other end of the negative pressure exhaust joint is communicated with the coring inner cylinder, and when the exhaust hole (72) is closed and the pressure of the coring inner cylinder is smaller than the pressure in the high-pressure air bin (30), the transmission mechanism can supplement the pressure for the coring inner cylinder.
2. The pressure control compensation exhaust system according to claim 1, wherein one end of the differential pressurizing rod (3) is connected with the lifting joint (1) in a sealing way, the other end of the differential pressurizing rod (3) is provided with a sealing part (31), the differential connecting sleeve (4) and the shunt gas injection joint (5) are connected and enclose to form a cavity, the sealing part (31) is positioned in the cavity and divides the cavity into a differential cavity (10) and a shunt cavity (20), the sealing part (31) is in sealing abutting connection with the inner wall of the cavity, and the differential connecting sleeve (4) can move relative to the sealing part (31) so as to change the sizes of the differential cavity (10) and the shunt cavity (20).
3. The pressure-controlled compensating exhaust system according to claim 2, wherein the differential pressurizing rod (3) is provided with a first hole (32) therethrough in an axial direction thereof, the differential pressurizing rod (3) is provided with a second hole (33) therethrough in a radial direction thereof, the second hole (33) is communicated with the first hole (32), the first hole (32) and the second hole (33) are commonly used for communicating the lifting joint (1) and the differential chamber (10), and the first hole (32) is used for communicating the lifting joint (1) and the shunt chamber (20).
4. A pressure-controlled compensating exhaust system according to claim 3, characterized in that the differential connection sleeve (4) is provided with a differential hole (41) in the circumferential direction, through which second hole (33) the drilling fluid entering the differential chamber (10) can flow out of the transmission mechanism through the differential hole (41).
5. A pressure-controlled compensating exhaust system according to claim 3, characterized in that the split gas injection joint (5) is circumferentially provided with a split bore (51), through which first bore (32) the drilling fluid entering the split chamber (20) can flow out of the transmission mechanism through the split bore (51).
6. A pressure control compensated exhaust system according to claim 3, characterized in that the pressure control compensated exhaust system further comprises a blocking member (9), the blocking member (9) being adapted to block the first hole (32) for blocking communication between the lifting joint (1) and the shunt chamber (20).
7. The pressure-controlled compensating exhaust system according to claim 1, characterized in that a side negative pressure valve (61) is arranged in the circumferential direction of the piston pressure connection (6), through which side negative pressure valve (61) the drilling fluid outside the transmission can enter the pressure guiding cabin (40).
8. The pressure control and compensation exhaust system according to claim 1, characterized in that the sleeve assembly (2) further comprises a sealing sliding sleeve (22), the sealing sliding sleeve (22) is sleeved on the negative pressure exhaust joint (7), and the sealing sliding sleeve (22) can slide relative to the negative pressure exhaust joint (7) by abutting against the linkage pushing cylinder (21) to close the exhaust hole (72).
9. The pressure control and compensation exhaust system according to claim 1, characterized in that the piston assembly (8) comprises a piston (81), a spring (82) and a spring seat (83), the spring seat (83) is arranged in the pressure guiding bin (40), one end of the spring (82) is sleeved on the spring seat (83), the other end of the spring (82) is sleeved on the piston (81), and the spring (82) can be used for adjusting the relative positions of the piston (81) and the spring seat (83) so as to balance the pressure of the high-pressure gas bin (30) and the pressure guiding bin (40).
10. The pressure control compensation exhaust system according to claim 1, characterized in that an air injection valve (52) is arranged in the circumferential direction of the split air injection joint (5), an air injection channel (53) which is communicated with the air injection valve (52) and the high-pressure air bin (30) is further arranged on the split air injection joint (5), and the air injection valve (52) and the air injection channel (53) are used for injecting inert gas into the high-pressure air bin (30).
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| CN202111650699.2A CN116411848B (en) | 2021-12-30 | 2021-12-30 | A pressure-controlled compensating exhaust system |
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| CN202111650699.2A CN116411848B (en) | 2021-12-30 | 2021-12-30 | A pressure-controlled compensating exhaust system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909202A (en) * | 2016-07-05 | 2016-08-31 | 中交第四航务工程勘察设计院有限公司 | Coring drilling tool based on hydraulic clamping coring |
| CN110552644A (en) * | 2019-10-05 | 2019-12-10 | 中国石油大学(华东) | In-situ coal rock heat-preservation pressure-maintaining coring device and application method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1745871A1 (en) * | 1990-05-03 | 1992-07-07 | А. И. Димитращук, О. Ю. Димитращук, В, И. Шимечко, Н. Н. Вельских и Ю. А. Чертков | Device for determination of core orientation |
| US6216804B1 (en) * | 1998-07-29 | 2001-04-17 | James T. Aumann | Apparatus for recovering core samples under pressure |
| US6719070B1 (en) * | 2000-11-14 | 2004-04-13 | Baker Hughes Incorporated | Apparatus and methods for sponge coring |
| CN2740765Y (en) * | 2004-10-22 | 2005-11-16 | 地质矿产部勘探技术研究所 | Fidelity sampling drilling tool |
| US9926756B2 (en) * | 2013-07-18 | 2018-03-27 | Baker Hughes Incorporated | Pressure compensation modules for coring tools, coring tools including pressure compensation modules, and related methods |
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2021
- 2021-12-30 CN CN202111650699.2A patent/CN116411848B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909202A (en) * | 2016-07-05 | 2016-08-31 | 中交第四航务工程勘察设计院有限公司 | Coring drilling tool based on hydraulic clamping coring |
| CN110552644A (en) * | 2019-10-05 | 2019-12-10 | 中国石油大学(华东) | In-situ coal rock heat-preservation pressure-maintaining coring device and application method |
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