CN113356805A - Inter-well agitation type gas lift induced flow device and gas lift induced flow method - Google Patents

Inter-well agitation type gas lift induced flow device and gas lift induced flow method Download PDF

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Publication number
CN113356805A
CN113356805A CN202110809562.0A CN202110809562A CN113356805A CN 113356805 A CN113356805 A CN 113356805A CN 202110809562 A CN202110809562 A CN 202110809562A CN 113356805 A CN113356805 A CN 113356805A
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well
gas
fault
liquid
valve
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CN113356805B (en
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袁勋
李立民
刘洋
郭秩瑛
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Tianjin Branch
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Tianjin Branch
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121Lifting well fluids
    • E21B43/122Gas lift
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/02Valve arrangements for boreholes or wells in well heads
    • E21B34/04Valve arrangements for boreholes or wells in well heads in underwater well heads
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/01Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/18Repressuring or vacuum methods

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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)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Abstract

A well-to-well agitation type gas lift induced flow device and a gas lift induced flow method are disclosed, wherein a small period and a high frequency open flow and close a well are carried out, and elevation mixed liquid is gradually formed, so that the pressure drop of a liquid column in a shaft is reduced, the production pressure difference is increased, formation oil gas is started to enter the shaft, and the self-flow of an oil well is recovered; the method comprises the following steps: firstly, the method comprises the following steps: closing the production wing valve and the oil nozzle of the fault well, opening the production main valve and the wing valve of the fault well, and introducing high-pressure gas of an adjacent well into an oil pipe of the fault well; II, secondly: stewing; thirdly, the method comprises the following steps: closing the adjacent well wing valve, and opening the fault well wing valve and the oil nozzle to enable gas and liquid in the well shaft of the fault well to move upwards; fourthly, the method comprises the following steps: closing the oil nozzle of the fault well, stopping the migration of the upper gas, and slowing the upward migration speed of the far-end gas; the liquid at the lower part moves upwards and invades into the gas at the upper part to form a gas-liquid mixed flow state; fifthly: repeating the above process to enlarge the gas-liquid mixed fluid liquid column and move to the ground; sixthly, the method comprises the following steps: and starting stratum oil gas to enter a shaft for induced flow, and performing self-flow and production recovery. The invention has low operation cost; is suitable for the similar wells.

Description

Inter-well agitation type gas lift induced flow device and gas lift induced flow method
Technical Field
The invention belongs to the technical field of oil and gas exploitation, and particularly relates to an interwell agitation type gas lift induced flow device and a gas lift induced flow method.
Background
At present, in the production process of a self-blowing well of an offshore oil field, the energy of the stratum of the self-blowing well is utilized to continuously lift stratum fluid to the ground, and the self-blowing production is realized. However, during the production process of the flowing well, the flowing well stop problem can be caused by insufficient formation productivity or bottom hole liquid accumulation after the well is shut down in the test operation.
The conventional common method for solving the problem of accumulated liquid blowout stop of the flowing well comprises the following steps: firstly, an adjacent well high-pressure air source is used for injecting an oil pipe, so that the density of the oil pipe is reduced, the flow back pressure is reduced, and the conventional open flow is carried out; however, the method is determined according to the energy level of the formation, the water content and the degree of the wellbore liquid accumulation, so the success rate is not high; and secondly, induced spraying is carried out through coiled tubing operation, but the method has a long operation period, so that the operation cost is high.
Disclosure of Invention
The invention aims to provide an interwell agitation type gas lift induced flow device and a gas lift induced flow method, and aims to solve the technical problem of field liquid accumulation stopping of a self-blowing well.
In order to achieve the purpose, the specific technical scheme of the inter-well agitation type gas lift induced flow device and the gas lift induced flow method is as follows:
an interwell agitation type gas lift induced-flow device, comprising: the system comprises a kill manifold arranged outside a shaft and a plurality of control devices connected with the kill manifold; wherein, the first way in the number way controlling means: is provided with: the cross-shaped pipelines are respectively provided with a well-facing service oil pipe control valve; and the control valve of the well-facing service oil pipe at one end is also connected with a fault well oil pressure gauge through a pipeline; the oil pipe control valve of the adjacent well service at the other end is also connected with the stepped pipeline through a pipeline; the second path in the digital control device: is provided with: the system comprises a plurality of fault well service oil pipe control valves arranged on a pipeline, wherein the pipeline is in a cross shape, and each cross-shaped pipeline is respectively provided with a fault well service oil pipe control valve, a fault well production control valve and a fault well production main valve; the control valve of the service oil pipe of the fault well is connected with the oil pressure gauge of the fault well through a pipeline; the production control valve of the fault well is respectively connected with a choke of the fault well and a closed discharge tank through pipelines, and the closed discharge tank is connected with a torch head; and the main valve of the fault well at the other end is also connected with the stepped pipeline through a pipeline.
Further, the control valve of the service oil pipe of the fault well is a wing valve of the service oil pipe of the fault well.
Further, the production control valve of the fault well is a production wing valve of the fault well.
Further, the main production valve of the fault well is a straight-through valve.
Furthermore, the closed-discharge tank is rectangular, and arc-shaped covers protruding outwards are arranged at two ends of the rectangle.
The invention also provides an interwell agitation type gas lift induced flow method, which is provided with the interwell agitation type gas lift induced flow device, wherein gas-liquid mixed fluid is generated by small-period high-frequency open flow-close of a well and gradually forms high-elevation mixed liquid by utilizing larger inertia difference between gas and liquid in a shaft, so that the pressure drop of a liquid column in the shaft is gradually reduced, the pressure difference is increased to a certain degree, and then formation oil gas is successfully started to enter the shaft, and the self-flow of an oil well is recovered;
the method comprises the following steps:
the first step is as follows: closing a production wing valve and a choke of the fault well, opening a production main valve and a service oil pipe wing valve of the fault well, then opening a service oil pipe wing valve of an adjacent well, and enabling high-pressure gas of the adjacent well to enter an oil pipe of the fault well through a kill manifold;
the second step is that: soaking the well to increase the compression amount of the high-pressure gas and store power energy;
the third step: closing a service oil pipe wing valve of an adjacent well, opening a production wing valve of a fault well and a nozzle of the fault well, increasing production pressure difference, blowing in large-displacement instantaneous quantity, enabling gas and liquid in a well shaft of the fault well to move upwards at high flow rate, and recording the change condition of an oil pressure gauge of the fault well;
the fourth step: closing the oil nozzle of the fault well;
the fifth step: repeating the third step and the fourth step to enable the generated gas-liquid mixed fluid state liquid to be continuously enlarged and move upwards until the gas-liquid mixed fluid state liquid is lifted to the ground;
and a sixth step: and repeating the first step and the fifth step, continuously lifting the formed gas-liquid mixed flow state liquid column to the ground in an interwell swinging mode, realizing staged flowback of the accumulated liquid in the shaft, finally realizing successful induced flow and self-spraying and production recovery.
Further, in the second step, the soaking time lasts for 2-3 hours.
Further, in the third step, the instantaneous discharge amount of the large discharge amount is: 8000 squares/hour, and for 1 min.
Further, in the fourth step, the purpose of closing the oil nozzle of the fault well is to stop the migration of the upper gas, and the upward migration speed of the far-end gas is reduced under the action of inertia force and compressibility; and the liquid at the lower part continuously moves upwards at a high flow rate under the action of larger inertia force and continuously disperses and invades into the gas at the upper part to form gas-liquid mixed fluid.
Further, in the fifth step, after repeating the third step and the fourth step, and through 4-5 cycles, the generated gas-liquid mixed fluid state liquid is continuously enlarged and moved upwards until the gas-liquid mixed fluid state liquid is lifted to the ground.
The inter-well agitation type gas lift induced flow device and the gas lift induced flow method have the following advantages:
1. the invention has convenient operation, lower operation cost and shorter operation period;
2. the invention utilizes larger inertia difference between gas and liquid in the shaft, and opens and closes the well in a small period and high frequency, so as to generate gas-liquid mixed fluid and gradually form larger height mixed fluid, thereby gradually reducing the pressure drop of a shaft fluid column, increasing the production pressure difference to a certain degree, further successfully starting formation oil gas to enter the shaft, and recovering the self-injection of the oil well;
3. the invention is suitable for similar wells and solution treatment, and is popularized and used.
Drawings
FIG. 1 is a schematic representation of a wellbore flow regime change of the present invention;
FIG. 2 is a schematic view of the gas lift induced spray process of the present invention.
The notation in the figure is:
1. a kill manifold; 2. an oil pipe control valve for the well-facing service; 3. a faulty well oil pressure gauge; 4. a failed well service tubing control valve; 5. a failed well production control valve; 6. a failed well choke; 7. a failed well production master valve; 8. closing the discharge tank; 9. torch head, 10, gas in the shaft; 11. gas-liquid mixed fluid in a shaft; 12. a fluid in the wellbore.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following describes an inter-well agitation type gas lift induced-flow device and a gas lift induced-flow method in further detail with reference to the attached drawings.
As shown in fig. 1 to 2, the present invention includes: the system comprises a kill-job manifold 1 arranged outside a shaft and a plurality of control devices (the number of the circuits in the embodiment is two) connected with the kill-job manifold 1; wherein, the first way in the number way controlling means: is provided with: the cross-shaped pipelines are provided with the well-facing service oil pipe control valves 2 respectively; and the well-facing service oil pipe control valve 2 at one end is also connected with a fault well oil pressure gauge through a pipeline; the oil pipe control valve 2 for near-well service at the other end is also connected with the stepped pipeline through a pipeline;
the second path in the digital control device: is provided with: a plurality of fault well service oil pipe control valves 4 are arranged on the pipeline, the pipeline is in a cross shape, and each cross-shaped pipeline is respectively provided with a fault well service oil pipe control valve 4, a fault well production control valve 5 and a fault well production main valve 7; and the control valve 4 of the service oil pipe of the fault well is connected with the oil pressure gauge 3 of the fault well through a pipeline; the production control valve 5 of the fault well is respectively connected with a choke 6 of the fault well and a closed discharge tank 8 through pipelines, and the closed discharge tank 8 is connected with a flare torch head 9; wherein the other end of the main valve 7 for producing a defective well is further connected with a stepped pipeline through a pipeline.
The shaft of the invention is provided with: gas 10 and liquid in the shaft are produced into gas-liquid mixed fluid 11 in the shaft through small-period high-frequency open flow-shut-in by utilizing larger inertia difference between the gas 10 and the liquid in the shaft, and the liquid 12 in the shaft with larger height mixing is gradually formed, so that the pressure drop of the liquid 12 in the shaft is gradually reduced, the near-well pressure difference is increased to a certain degree, further, stratum oil gas is successfully started to enter the shaft, and the self-flow of the oil well is recovered.
The well-facing service oil pipe control valve 2 is a well-facing service oil pipe wing valve.
The control valve 4 of the service oil pipe of the fault well is a wing valve of the service oil pipe of the fault well.
The production control valve 5 of the fault well is a production wing valve of the fault well.
The main production valve 7 of the fault well is a straight-through valve.
The closed discharge tank 8 is rectangular, and arc-shaped covers protruding outwards are mounted at two ends of the rectangle.
The main principle of the invention is as follows: after high-pressure gas of an adjacent well is injected into a blowout-stopping well oil pipe from a well mouth, when the blowout is performed with zero return pressure and large discharge capacity, the gas at the upper part of a shaft and the liquid at the lower part of the shaft move upwards at the same speed.
When the well choke 6 is closed, the upper gas column is closest to the part of the well choke 6, which is blocked by the well choke 6, and stops moving, and the relatively far gas column compresses itself due to inertia and compressibility of the gas, and slows down the upward moving speed; the liquid therein continuously moves upwards at a high speed due to large inertia, and continuously disperses to invade into the gas column and form gas-liquid mixed fluid 11 in the shaft. Again, the zero-back pressure large displacement blowout, again imparts a high velocity of upward migration of the wellbore fluid 12. The failed well choke 6 is closed again and the elevation of the column of mixed fluid 11 in the wellbore is increased. After a plurality of cycles, the elevation of the gas-liquid mixed fluid 11 in the shaft is gradually increased to form a large-elevation mixed fluid column, so that the pressure drop of the shaft fluid 12 is gradually reduced, the near-well pressure difference is increased to a certain degree, the pressure difference between the formation pressure and the shaft fluid is higher than the formation starting pressure difference, the formation oil gas is successfully started to enter the shaft, and the self-injection of the oil well is recovered.
The invention firstly utilizes larger inertia difference between gas and liquid in the shaft, opens and closes the well with small period and high frequency, generates gas-liquid mixed fluid 11, and gradually forms liquid 12 in the shaft with larger height mixing, thereby gradually reducing the pressure drop of the liquid 12 in the shaft, increasing the near-well pressure difference to a certain degree, further successfully starting stratum oil gas to enter the shaft, and recovering the self-injection of the oil well.
The invention adopts the following operation steps:
the first step is as follows: and closing the production wing valve and the oil nozzle 6 of the fault well, opening the production main valve 7 of the fault well and the wing valve of the service oil pipe, then opening the wing valve of the service oil pipe of the adjacent well, and introducing the high-pressure gas of the adjacent well into the oil pipe of the fault well through the kill manifold 1.
The second step is that: and (4) stewing for 2-3 hours to increase the compression amount of the high-pressure gas and store power energy.
The third step: closing the wing valve of the service oil pipe of the adjacent well, opening the production wing valve of the fault well and the oil nozzle 6 of the fault well, increasing the production pressure difference, and taking the instantaneous discharge volume of large discharge as: 8000 square/hour, making the gas and liquid in the fault well shaft move upwards at high flow rate, and recording the change condition of the oil pressure gauge 3 of the fault well after lasting for 1 min.
The fourth step: the well choke 6 of the fault well is closed, the upper gas stops moving due to the blocking of the choke 6, and the gas running speed of the far-end gas is reduced due to the inertia force and compressibility of the gas; the liquid in the lower part is continuously moved upwards at a high flow rate under the action of large inertia force, and is dispersed and invaded into the gas in the upper part to form gas-liquid mixed fluid.
The fifth step: repeating the third step and the fourth step, and continuously increasing and moving the generated gas-liquid mixed fluid state liquid upwards through 4-5 cycles until the gas-liquid mixed fluid state liquid is lifted to the ground.
And a sixth step: and repeating the first step, the second step, the third step, the fourth step and the fifth step, and continuously lifting the formed gas-liquid mixed fluid state liquid to the ground in a manner of surging among wells, so that the staged flowback of the accumulated liquid in the shaft is realized, the induced flow is successful finally, and the self-spraying production is repeated.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixed or detachably or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The kill manifold and the wing valve; the oil pressure gauge, the oil nozzle, the production main valve, the closed discharge tank and the torch head are the prior art, and the unexplained technology is the prior art, so the details are not repeated.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. The utility model provides an interwell is swashed formula gas lift and is induced flow device which characterized in that includes: the system comprises a kill manifold arranged outside a shaft and a plurality of control devices connected with the kill manifold; wherein, the first way in the number way controlling means: is provided with: the cross-shaped pipelines are respectively provided with a well-facing service oil pipe control valve; and the control valve of the well-facing service oil pipe at one end is also connected with a fault well oil pressure gauge through a pipeline; the oil pipe control valve of the adjacent well service at the other end is also connected with the stepped pipeline through a pipeline; the second path in the digital control device: is provided with: the system comprises a plurality of fault well service oil pipe control valves arranged on a pipeline, wherein the pipeline is in a cross shape, and each cross-shaped pipeline is respectively provided with a fault well service oil pipe control valve, a fault well production control valve and a fault well production main valve; the control valve of the service oil pipe of the fault well is connected with the oil pressure gauge of the fault well through a pipeline; the production control valve of the fault well is respectively connected with a choke of the fault well and a closed discharge tank through pipelines, and the closed discharge tank is connected with a torch head; and the main valve of the fault well at the other end is also connected with the stepped pipeline through a pipeline.
2. The interwell sloshing gas lift induced flow device according to claim 1, wherein the faulty well service tubing control valve is a faulty well service tubing wing valve.
3. The inter-well sloshing gas lift induced flow device of claim 1, wherein said failed well production control valve is a failed well production wing valve.
4. The inter-well sloshing gas lift induced flow device according to claim 1, wherein said failed well production main valve is a straight-through valve.
5. The inter-well sloshing type gas lift induced-flow device of claim 1, wherein the closed row tank has a rectangular shape, and arc-shaped covers protruding outwards are installed at two ends of the rectangular shape.
6. An interwell agitation type gas lift induced flow method is characterized in that an interwell agitation type gas lift induced flow device as claimed in any one of claims 1-5 is arranged, gas-liquid mixed fluid is generated by small-period high-frequency open-close well by utilizing larger inertia difference between gas and liquid in a shaft, and mixed liquid with larger height is gradually formed, so that liquid pressure drop in the shaft is gradually reduced, near-well pressure difference is increased to a certain degree, and then formation oil gas is successfully started to enter the shaft, and self-flow of an oil well is recovered;
the method comprises the following steps:
the first step is as follows: closing a production wing valve and a choke of the fault well, opening a production main valve and a service oil pipe wing valve of the fault well, then opening a service oil pipe wing valve of an adjacent well, and enabling high-pressure gas of the adjacent well to enter an oil pipe of the fault well through a kill manifold;
the second step is that: soaking the well to increase the compression amount of the high-pressure gas and store power energy;
the third step: closing a service oil pipe wing valve of an adjacent well, opening a production wing valve of a fault well and a nozzle of the fault well, increasing production pressure difference, blowing in large-displacement instantaneous quantity, enabling gas and liquid in a well shaft of the fault well to move upwards at high flow rate, and recording the change condition of an oil pressure gauge of the fault well;
the fourth step: closing the oil nozzle of the fault well;
the fifth step: repeating the third step and the fourth step to enable the generated gas-liquid mixed fluid state liquid to be continuously enlarged and move upwards until the gas-liquid mixed fluid state liquid is lifted to the ground;
and a sixth step: and repeating the first step and the fifth step, continuously lifting the formed gas-liquid mixed flow state liquid column to the ground by an interwell agitation type method, realizing the staged flowback of the accumulated liquid in the shaft, finally realizing the success of induced spraying and the self-spraying and the reproduction.
7. The method of claim 6, wherein in the second step, the soaking time lasts 2-3 hours.
8. The method of claim 6, wherein in the third step, the instantaneous discharge amount of the large discharge is: 8000 squares/hour, and for 1 min.
9. The method of claim 6, wherein in the fourth step, the purpose of closing the failed well nozzle is to stop the upper gas from moving, and the far-end gas slows down the upward movement under the action of inertia force and compressibility; and the liquid at the lower part continuously moves upwards at a high flow rate under the action of larger inertia force and continuously disperses and invades into the gas at the upper part to form gas-liquid mixed fluid.
10. The method for inducing the flow of gas lift by agitating among wells according to claim 6, wherein in the fifth step, after repeating the third step and the fourth step, the generated gas-liquid mixed flow state liquid is continuously enlarged and moved upwards through 4-5 cycles until the gas-liquid mixed flow state liquid is lifted to the ground.
CN202110809562.0A 2021-07-16 2021-07-16 Inter-well agitation type gas lift induced flow device and gas lift induced flow method Active CN113356805B (en)

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Publication number Priority date Publication date Assignee Title
CN114961659A (en) * 2022-07-12 2022-08-30 中国石油化工股份有限公司 Gas storage injection and production well injection and production device and induced-flow drainage method

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CN206091948U (en) * 2016-10-25 2017-04-12 中国石油化工股份有限公司 Airlift unit between portable well
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CN111075400A (en) * 2018-10-18 2020-04-28 中国石油化工股份有限公司 Inter-well gas lift intelligent gas injection method and system
CN111894525A (en) * 2020-08-14 2020-11-06 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 Device and method for composite integrated drainage and mining of unconventional gas reservoir platform

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Publication number Priority date Publication date Assignee Title
US4711306A (en) * 1984-07-16 1987-12-08 Bobo Roy A Gas lift system
CN202767967U (en) * 2012-08-07 2013-03-06 中国石油化工股份有限公司 Self-circulation gas lift drainage gas recovery process device suitable for well outside station
CN104500007A (en) * 2014-12-31 2015-04-08 山东威马泵业股份有限公司 Method and equipment for forcibly lifting water or oil by air energy
CN206091948U (en) * 2016-10-25 2017-04-12 中国石油化工股份有限公司 Airlift unit between portable well
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CN209483309U (en) * 2018-12-10 2019-10-11 中国石油天然气股份有限公司 Airlift unit
CN111894525A (en) * 2020-08-14 2020-11-06 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 Device and method for composite integrated drainage and mining of unconventional gas reservoir platform

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114961659A (en) * 2022-07-12 2022-08-30 中国石油化工股份有限公司 Gas storage injection and production well injection and production device and induced-flow drainage method

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