CN110805410A - Intelligent sliding sleeve of bridge-plug-free multistage fracturing electric control switch - Google Patents
Intelligent sliding sleeve of bridge-plug-free multistage fracturing electric control switch Download PDFInfo
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- CN110805410A CN110805410A CN201911129732.XA CN201911129732A CN110805410A CN 110805410 A CN110805410 A CN 110805410A CN 201911129732 A CN201911129732 A CN 201911129732A CN 110805410 A CN110805410 A CN 110805410A
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- 239000003638 chemical reducing agent Substances 0.000 claims description 21
- 230000001939 inductive effect Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000005553 drilling Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to an intelligent sliding sleeve of a bridge-plug-free multistage fracturing electric control switch, which mainly comprises an upper connector (1), a control system (18), an inner cylinder (3), an outer cylinder (4), a piston (15), a fracturing sleeve (16) and a lower connector (17). The control system (18) detects a pressure signal by means of the pressure sensor (2) and then drives the motor (7) to work, the pressure signal is transmitted to the ball screw (10) after two-stage speed reduction, the ball screw (10) performs telescopic motion, and the opening and closing of the pressurizing hole are controlled by the piston (15) to complete fracturing construction operation. The structure of the invention does not need to put in the bridge plug, thereby avoiding the drilling and grinding of the bridge plug and the blocking of bridge plug scraps on the fracturing process; after the fracturing operation is completed, the fracturing channel is closed by using an electric control system, so that the conventional sliding sleeve is prevented from being always opened after being fractured; the intelligent operation of the sliding sleeve is realized by transferring force through the pressure sensor (2), the fracturing operation efficiency is improved, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of oil and gas field reservoir layer reconstruction, in particular to an intelligent sliding sleeve of a bridge-plug-free multistage fracturing electric control switch.
Background
In recent years, with the continuous progress of drilling technology, oil exploitation gradually develops from a medium-high permeability conventional reservoir hydrocarbon reservoir to a low-hole, low-permeability and low-pressure unconventional hydrocarbon reservoir. In the face of the exploitation of low-permeability oil and gas reservoirs, the staged fracturing technology is an effective means for improving the exploitation of low-permeability reservoirs. The sliding sleeve is the main technical means of pit shaft segmentation, the sliding sleeve is mostly only realized opening of sliding sleeve to current sliding sleeve, is difficult to realize the process of closing, therefore the work progress is mostly based on the mode of bridging plug and sliding sleeve cooperation operation, each section fracturing respectively in the realization pit shaft, the mode through boring the bridging plug after the construction is accomplished is dredged the well passageway, this operation mode exists with high costs, the cycle length and the operation flow is complicated, the bridge plug piece can't return a lot of problems such as well head influence follow-up operation. In order to reduce the bridge plug drilling operation process, a soluble bridge plug is developed later, the bridge plug drilling operation process is avoided in a mode of dissolving the bridge plug in underground acid liquid, but the operation mode still has the problems of long construction period, more limited conditions and the like. Therefore, an underground intelligent switch sliding sleeve is developed, the underground intelligent switch of the sliding sleeve is realized, and the multistage staged fracturing operation efficiency and the fracturing operation cost can be greatly improved.
Patent 203463073U a can repeat switch sleeve pipe sliding sleeve, the device keeps the sleeve pipe sliding sleeve unanimous with the intraductal latus rectum of cover, utilizes supporting switch instrument, realizes the layering fracturing operation. Although the device drills the bridge plug, the opening and closing of the sliding sleeve need to be carried out by tools from the wellhead, and the construction operation is complex.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multistage fracturing sliding sleeve which is high in automation degree and does not need to use a bridge plug.
The purpose of the invention is realized by the following technical scheme: a bridge-plug-free multi-stage fracturing electric control switch intelligent sliding sleeve comprises an upper joint, an inner cylinder, an outer cylinder, a piston, a fracturing sleeve, a lower joint and a control system; the upper joint is connected with the upper end of the inner barrel, the outer barrel sleeve is arranged outside the inner barrel, the upper end of the fracturing sleeve is connected with the lower end of the inner barrel, the lower end of the fracturing sleeve is connected with the upper end of the lower joint, the middle part of the inner barrel is provided with a first step, the two ends of the first step are respectively provided with a second step and a first annular groove, a first annular space is formed between the first annular groove and the outer barrel, the control system is arranged in the first annular space, the lower end surface of the outer barrel is abutted against the upper end surface of the first step, the lower end surface of the first step is abutted against the upper end surface of the fracturing sleeve, the inner barrel is provided with a through hole for communicating the lower end surface of the first annular groove with the lower end surface of the second step, a valve rod is arranged in the through hole, the lower end of the valve rod is connected with the upper end of, the lower terminal surface of fracturing cover supports and leans on in the up end of third step, form the second annular space between the lower terminal surface of second step and the up end of fourth step, the piston sets up in the second annular space, it is gapped between inner tube and the lower clutch, clearance and second annular space intercommunication, be provided with a plurality of pressure ports on the lateral wall of second annular space part on the fracturing cover.
The upper end of the inner barrel is provided with a pressure sensor, an inductive probe of the pressure sensor is arranged in the inner barrel, and the output end of the pressure sensor is connected with a control system.
The control system comprises a circuit board, a battery pack, a motor, a speed reducer, a coupler, a ball screw, a connecting piece and a fixing sleeve, wherein the output end of the circuit board is electrically connected with the motor, the input end of the circuit board is connected with the output end of a pressure sensor, the battery pack is electrically connected with the circuit board and the motor respectively, the output shaft of the motor is connected with the speed reducer, the output shaft of the speed reducer is connected with the upper end of the ball screw through the coupler, the ball screw is rotatably fixed on the inner wall of the outer barrel, the lower end of the ball screw is sleeved with the connecting piece, the upper end of the connecting piece is provided with an external thread, the lower end of the connecting piece is provided with an internal thread, the upper end of the connecting piece is matched and connected with the, the connecting piece drives the valve rod along ball screw's axial direction reciprocating motion, set up on the fixed sleeve with the connecting piece to the through-hole that matches, the axial direction of through-hole is the same with ball screw's axial direction, the connecting piece moves along the through-hole on the fixed sleeve under ball screw effect, the fixed sleeve passes through the fix with screw on the inner wall of urceolus.
The circuit board is welded on the inner wall of the outer barrel.
The pressure sensor is bonded to the upper end of the inner cylinder by an adhesive.
And the outer wall of the inner barrel is provided with a motor mounting seat, and the motor is fixed in the motor mounting seat.
The speed reducer is a two-stage gear speed reducer, and the speed reducer is fixed on the motor.
And pressurizing holes are formed in the axial direction and the circumferential direction of the fracturing sleeve. The opening number of the pressurizing holes is controlled through the up-and-down movement of the piston, so that the multi-stage fracturing is realized. The circuit board controls the rotation time of the motor to control the up-and-down movement distance of the piston through different pressures transmitted from the upper joint, thereby achieving the aim of multi-stage fracturing.
The invention has the following advantages:
1. in the fracturing process, a bridge plug does not need to be put in, so that the drilling and grinding of the bridge plug and the blocking of bridge plug scraps on the fracturing process are avoided;
2. after the fracturing operation is completed, the fracturing channel is closed by using an electric control system, so that the problem that a shaft is exposed to water too early due to the fact that the conventional sliding sleeve is always in an open state after being fractured is solved;
3. utilize pressure sensor 2 to pass power and realize the intelligent operation of sliding sleeve, degree of automation is high, improves fracturing operation efficiency.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a cross-sectional view of a portion of the control system 18 of the present invention;
FIG. 3 is a schematic view of the gear transmission of the reducer 8 of the present invention;
FIG. 4 is a flow chart of the operation of the present invention;
in the figure: 1-upper joint, 2-pressure sensor 2, 3-inner cylinder 3, 4-outer cylinder 4, 5-circuit board 5, 6-battery pack 6, 7-motor 7, 8-speed reducer 8, 9-coupler 9, 10-ball screw 10, 11-connecting piece 11, 12-screw 12, 13-fixing sleeve 13, 14-valve rod 14, 15-piston 15, 16-fracturing sleeve 16, 17-lower joint 17, 18-control system 18, 19-first gear 19, 20-second gear 20, 21-third gear 21, 22-fourth gear, 23-first step, 24-second step, 25-first annulus, 26-third step, 27-fourth step, 28-second annulus.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1, the intelligent sliding sleeve of the bridge plug-free multistage fracturing electric control switch comprises an upper joint 1, an inner cylinder 3, an outer cylinder 4, a piston 15, a fracturing sleeve 16, a lower joint 17 and a control system 18; the lower end of the upper joint 1 is in threaded connection with the upper end of the inner barrel 3, the outer barrel 4 is fixed outside the inner barrel 3 through threads, the upper end of the fracturing sleeve 16 is in threaded connection with the lower end of the inner barrel 3, the lower end of the fracturing sleeve 16 is in threaded connection with the upper end of the lower joint 17, a first step 23 is arranged in the middle of the inner barrel 3, a second step 24 and a first annular groove are respectively arranged at the two ends of the first step 23, a first annular groove 25 is formed between the first annular groove and the outer barrel 4, the control system 18 is arranged in the first annular groove 25, the lower end face of the outer barrel 4 is abutted against the upper end face of the first step 23, the lower end face of the first step 23 is abutted against the upper end face of the fracturing sleeve 16, a through hole for communicating the lower end face of the first annular groove with the lower end face of the second step 24 is arranged on the inner barrel 3, a valve rod 14 is arranged in the, the upper end of the valve rod 14 is connected with the lower end of the control system 18, a third step 26 and a fourth step 27 are arranged on the lower joint 17, the lower end face of the fracturing sleeve 16 abuts against the upper end face of the third step 26, a second annular space 28 is formed between the lower end face of the second step 24 and the upper end face of the fourth step 27, the piston 15 is arranged in the second annular space 28, a gap is formed between the inner barrel 3 and the lower joint 17, the gap is communicated with the second annular space 28, and a plurality of pressurizing holes are formed in the side wall of the part of the second annular space 28 on the fracturing sleeve 16.
The upper end of the inner cylinder 3 is provided with a pressure sensor 2, an inductive probe of the pressure sensor 2 is arranged inside the inner cylinder 3, and the output end of the pressure sensor 2 is connected with a control system 18.
As shown in fig. 2, the control system 18 includes a circuit board 5, a battery pack 6, a motor 7, a speed reducer 8, a coupler 9, a ball screw 10, a connecting member 11, and a fixing sleeve 13, an output end of the circuit board 5 is electrically connected to the motor 7, an input end of the circuit board 5 is connected to an output end of the pressure sensor 2, the battery pack 6 is electrically connected to the circuit board 5 and the motor 7, respectively, an output shaft of the motor 7 is connected to the speed reducer 8, an output shaft of the speed reducer 8 is connected to an upper end of the ball screw 10 through the coupler 9, the ball screw 10 is rotatably fixed to an inner wall of the outer cylinder 4, the lower end of the ball screw 10 is sleeved with the connecting member 11, an upper end of the connecting member 11 is provided with an external thread, a lower end of the connecting member 11 is provided with an internal thread, the connecting piece 11 reciprocates along the axial direction of the ball screw 10 under the action of the ball screw 10, the connecting piece 12 drives the valve rod 14 to reciprocate along the axial direction of the ball screw 10, a through hole matched with the connecting piece 11 is formed in the fixing sleeve 13, the axial direction of the through hole is the same as the axial direction of the ball screw 10, the connecting piece 11 moves along the through hole in the fixing sleeve 13 under the action of the ball screw 10, and the fixing sleeve 13 is fixed on the inner wall of the outer barrel 4 through the screw 12.
The ball screw 10 comprises a screw fixedly connected with the coupler 9 and a threaded sleeve sleeved outside the screw, the lower end of the threaded sleeve is connected with an external thread at the upper end of the connecting piece, the screw is driven by the motor 7 to rotate, and the threaded sleeve, the connecting piece, the valve rod 14 and the piston 15 are fixedly connected through threads, so that the threaded sleeve cannot rotate, and the threaded sleeve moves up and down under the rotating action of the screw, so that the piston 15 is driven to move up and down, and a pressurizing hole in the side wall of the fracturing sleeve 16 is opened or closed.
The connecting piece 11 is of an inverted bolt structure, a nut part of the inverted bolt structure is connected with the valve rod 14, and a screw rod part of the inverted bolt structure is connected with the screw sleeve. The opening part at the upper end of the fixed sleeve 13 is provided with a radial annular check ring which limits the connecting piece 11, limits the up-down moving range of the threaded sleeve, prevents the threaded sleeve from moving upwards to damage the connecting part of the coupler 9 and the lead screw, and simultaneously prevents the threaded sleeve from moving upwards to extrude the lead screw and the connecting piece 11, so that the connecting piece 11 falls off.
The circuit board 5 is welded to the inner wall of the outer cylinder 4.
The pressure sensor 2 is bonded to the upper end of the inner cylinder 3 by an adhesive.
The outer wall of the inner barrel 3 is provided with a motor mounting seat, and the motor 7 is fixed in the motor mounting seat.
As shown in fig. 3, the speed reducer 8 is a two-stage gear speed reducer 8, and is formed by meshing a first gear 19, a second gear 20, a third gear 21, and a fourth gear 22. The speed reducer 8 is fixed on the shell of the motor 7.
The fracturing sleeve 16 is provided with pressurizing holes in both the axial direction and the circumferential direction. The number of the opened pressurizing holes is controlled by the up-and-down movement of the piston 15, thereby realizing multi-stage fracturing. Through different pressures transmitted from the upper connector 1, the circuit board 5 controls the rotation time of the motor 7 to control the up-and-down movement distance of the piston 15, thereby achieving the purpose of multi-stage fracturing.
As shown in fig. 4, the working process of the present invention is as follows: when the well drilling tool works, the sliding sleeve and the casing are connected together and are put into the well. When the sliding bush is pushed down, the nut ball screw 10 is in a contracted state. During fracturing construction, pressure current signals are transmitted to the inner barrel 3 and the pressure sensor 2, the sensor starts the motor 7 after detecting that pressure reaches a preset value, the coupler 9 drives the nut ball screw 10 to work after two-stage speed reduction is carried out through the speed reducer 8, the nut ball screw 10 pushes the valve rod 14 connected with the nut to move downwards, the pressurizing hole sealed by the piston 15 is opened, sliding sleeve opening operation is completed, the pressure sensor 2 transmits different pressure current signals according to different pressures, the circuit board 5 controls the rotation time of the motor 7 according to different pressure current signals, so that the moving distance of the piston 15 is controlled, the number of the pressurizing holes opened by the movement of the piston 15 on the fracturing sleeve 16 is controlled, and the purpose of multi-stage fracturing is achieved. After the fracturing operation is completed, pressure is stopped to be applied to the interior of the pipe column, the pressure in the pipe column is reduced, when the pressure is reduced to a certain value, a pressure current signal sent by the pressure sensor 2 starts the motor 7 and enables the motor 7 to rotate reversely, the nut ball screw 10 is driven to retract, the piston 15 is pulled by the valve rod 14 to close the sliding sleeve, and the fracturing operation of the well section is completed.
Claims (7)
1. The utility model provides a no bridge plug multistage fracturing electric control switch intelligence sliding sleeve which characterized in that: comprises an upper joint (1), an inner cylinder (3), an outer cylinder (4), a piston (15), a fracturing sleeve (16), a lower joint (17) and a control system (18); the upper joint (1) is connected with the upper end of the inner barrel (3), the outer barrel (4) is sleeved outside the inner barrel (3), the upper end of the fracturing sleeve (16) is connected with the lower end of the inner barrel (3), the lower end of the fracturing sleeve (16) is connected with the upper end of the lower joint (17), the middle part of the inner barrel (3) is provided with a first step (23), the two ends of the first step (23) are respectively provided with a second step (24) and a first annular groove, a first annular space (25) is formed between the first annular groove and the outer barrel (4), the control system (18) is arranged in the first annular space (25), the lower end face of the outer barrel (4) is abutted against the upper end face of the first step (23), the lower end face of the first step (23) is abutted against the upper end face of the fracturing sleeve (16), the inner barrel (3) is provided with a through hole for communicating the lower end face of the first annular groove with the second step (24), the fracturing sleeve is characterized in that a valve rod (14) is arranged in the through hole, the lower end of the valve rod (14) is connected with the upper end of a piston (15), the upper end of the valve rod (14) is connected with the lower end of a control system (18), a third step (26) and a fourth step (27) are arranged on a lower joint (17), the lower end face of the fracturing sleeve (16) abuts against the upper end face of the third step (26), a second annular space (28) is formed between the lower end face of a second step (24) and the upper end face of the fourth step (27), the piston (15) is arranged in the second annular space (28), a gap is formed between the inner barrel (3) and the lower joint (17), the gap is communicated with the second annular space (28), and a plurality of pressurizing holes are formed in the side wall of the second annular space (28) on the fracturing sleeve (16).
2. The intelligent sliding sleeve of the bridge-plug-free multistage fracturing electric control switch according to claim 1, wherein: the upper end of the inner cylinder (3) is provided with a pressure sensor (2), an inductive probe of the pressure sensor (2) is arranged inside the inner cylinder (3), and the output end of the pressure sensor (2) is connected with a control system (18).
3. The intelligent sliding sleeve of the bridge-plug-free multistage fracturing electric control switch according to claim 2, wherein: the control system (18) comprises a circuit board (5), a battery pack (6), an electric motor (7), a speed reducer (8), a coupler (9), a ball screw (10), a connecting piece (11) and a fixed sleeve (13), the output end of the circuit board (5) is electrically connected with the electric motor (7), the input end of the circuit board (5) is connected with the output end of the pressure sensor (2), the battery pack (6) is respectively electrically connected with the circuit board (5) and the electric motor (7), the output shaft of the electric motor (7) is connected with the speed reducer (8), the output shaft of the speed reducer (8) is connected with the upper end of the ball screw (10) through the coupler (9), the ball screw (10) is rotatably fixed on the inner wall of the outer barrel (4), the lower end of the ball screw (10) is sleeved with the connecting piece (11), and the upper end of the connecting piece (11), the lower extreme is connected with valve rod (14) upper end, set up on fixed sleeve (13) and connecting piece (11) to the through-hole that matches, the axial direction of through-hole is the same with the axial direction of ball (10), connecting piece (11) move along the through-hole on fixed sleeve (13) under ball (10) effect, fixed sleeve (13) are fixed in on the inner wall of urceolus (4).
4. The intelligent sliding sleeve of the bridge-plug-free multistage fracturing electric control switch according to claim 3, wherein: the circuit board (5) is welded on the inner wall of the outer barrel (4).
5. The intelligent sliding sleeve of the bridge-plug-free multistage fracturing electric control switch according to claim 3, wherein: and a motor (7) mounting seat is arranged on the outer wall of the inner barrel (3), and the motor (7) is fixed in the motor (7) mounting seat.
6. The intelligent sliding sleeve of the bridge-plug-free multistage fracturing electric control switch according to claim 3, wherein: the speed reducer (8) is a secondary gear speed reducer (8), and the speed reducer (8) is fixed on the motor (7).
7. The intelligent sliding sleeve of the bridge-plug-free multistage fracturing electric control switch according to claim 1, wherein: and pressurizing holes are formed in the axial direction and the circumferential direction of the fracturing sleeve (16).
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| CN201911129732.XA CN110805410B (en) | 2019-11-18 | 2019-11-18 | Intelligent sliding sleeve of bridge-plug-free multistage fracturing electric control switch |
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| CN201911129732.XA CN110805410B (en) | 2019-11-18 | 2019-11-18 | Intelligent sliding sleeve of bridge-plug-free multistage fracturing electric control switch |
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| CN110805410A true CN110805410A (en) | 2020-02-18 |
| CN110805410B CN110805410B (en) | 2020-07-14 |
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| RU200033U1 (en) * | 2020-06-09 | 2020-10-01 | Общество с ограниченной ответственностью Сервисная Компания "Карат" | HYDRAULIC MONITORING NOZZLE |
| CN113266308A (en) * | 2021-06-21 | 2021-08-17 | 西南石油大学 | Well cementation sliding sleeve and method for infinite-stage alternate fracturing full-path switch of horizontal well |
| CN114991731A (en) * | 2021-03-01 | 2022-09-02 | 华鼎鸿基石油工程技术(北京)有限公司 | Well cementation fracturing tool with electric control sliding sleeve |
| CN115434664A (en) * | 2022-08-18 | 2022-12-06 | 中国石油天然气集团有限公司 | Temperature control type control method based on ground displacement change and underground sliding sleeve |
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| CN110067547A (en) * | 2019-04-19 | 2019-07-30 | 中国石油天然气股份有限公司 | Be applicable to pressure and drive with intelligent fracturing sliding sleeve |
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| CN114991731A (en) * | 2021-03-01 | 2022-09-02 | 华鼎鸿基石油工程技术(北京)有限公司 | Well cementation fracturing tool with electric control sliding sleeve |
| CN113266308A (en) * | 2021-06-21 | 2021-08-17 | 西南石油大学 | Well cementation sliding sleeve and method for infinite-stage alternate fracturing full-path switch of horizontal well |
| CN113266308B (en) * | 2021-06-21 | 2022-04-05 | 西南石油大学 | Well cementation sliding sleeve and method for infinite-stage alternate fracturing full-path switch of horizontal well |
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Effective date of registration: 20200908 Address after: Intercontinental building, 16 ande Road, Dongcheng District, Beijing, 100010 Co-patentee after: SICHUAN SHENGNUO OIL. AND GAS ENGINEERING TECHNOLOGY SERVICE Co.,Ltd. Patentee after: PetroChina Company Limited Address before: 618300 south section 3, Zhongshan Avenue, Guanghan City, Deyang City, Sichuan Province Co-patentee before: SICHUAN SHENGNUO OIL. AND GAS ENGINEERING TECHNOLOGY SERVICE Co.,Ltd. Patentee before: CHINA NATIONAL PETROLEUM CORPORATION, SOUTHWEST OIL & GASFIELD BRANCH, ENGINEERING TECHNOLOGY Research Institute |