CN106050198B - Comprehensive drainage gas production system for low-pressure low-yield well - Google Patents

Comprehensive drainage gas production system for low-pressure low-yield well Download PDF

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CN106050198B
CN106050198B CN201610615994.7A CN201610615994A CN106050198B CN 106050198 B CN106050198 B CN 106050198B CN 201610615994 A CN201610615994 A CN 201610615994A CN 106050198 B CN106050198 B CN 106050198B
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gas production
gas
oil pipe
drainage
pressure
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CN106050198A (en
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张泉
汤林
陈伯明
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Nanchong Southwest Petroleum University Design And Research Institute Co ltd
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Nanchong Southwest Petroleum University Design And Research Institute Co ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP 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
    • E21B43/166Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168Injecting a gaseous medium
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP 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

Abstract

The invention discloses a comprehensive drainage gas production system for a low-pressure low-yield well, and belongs to the technical field of design and manufacture of natural gas exploitation equipment. The comprehensive drainage gas production system for the low-pressure low-yield well can effectively input drainage gas production media into a liquid accumulation section below a gas production surface so as to effectively improve the drainage gas production effect. The comprehensive drainage gas production system comprises a gas production oil pipe capable of extending into a gas production surface of a shaft, an oil casing pipe sleeved outside the gas production oil pipe, a multifunctional conveying device and a packer, wherein the tail end of the multifunctional conveying device capable of extending below the gas production surface of the shaft penetrates through the gas production oil pipe, and a gap between the gas production oil pipe and one end, located at the gas production surface of the shaft, of the oil casing pipe is sealed through the packer; and the drainage gas production medium is used for removing the accumulated liquid below the gas production surface of the shaft of the low-pressure low-yield well, and is directly input into the accumulated liquid below the gas production surface under the coordination of the gas production oil pipe through the multifunctional conveying device.

Description

Comprehensive drainage gas production system for low-pressure low-yield well
Technical Field
The invention relates to a comprehensive drainage gas production system, in particular to a comprehensive drainage gas production system for a low-pressure low-yield well, and belongs to the technical field of design and manufacture of natural gas exploitation equipment.
Background
At the initial stage of production, particularly at the middle and later stages of production, most of low-yield low-pressure gas wells at home and abroad are provided with hydrocarbon condensate or formation water flowing into the bottom of a well, and when the yield of the gas well is high, the gas-liquid speed at the bottom of the well is high and the quantity of fluid in the well is relatively small, the water is completely carried to the ground by airflow. With the development of the mining process, the formation energy is naturally weakened, and the gas-liquid flow rate is reduced, so that the gas-liquid carrying capacity is poorer and poorer, the liquid at the bottom of a well can not be effectively brought to the ground at any time, and the accumulated liquid in a shaft is increased gradually. The existence of the effusion can increase the back pressure of the gas layer and limit the production capacity of the gas layer, sometimes the gas layer is completely pressed to shut down the well, so that the production cannot be normally carried out, the exploitation efficiency of the gas well is reduced, and the economic benefit of the whole gas field development is influenced. Therefore, the effective drainage and gas production process method is selected to discharge the accumulated liquid in the shaft in time, and the recovery of the normal production of the gas well is particularly important.
At present, the foam drainage gas production process technology is widely applied at home and abroad to solve the problem of low-pressure low-yield well bore liquid accumulation with water and gas reservoirs and improve the recovery ratio, but the conventional foam drainage agent filling mode mainly adopts direct filling through a well head Christmas tree oil sleeve, cannot effectively reach the well bore liquid accumulation section, seriously influences the drainage effect, and urgently needs to explore a novel drainage gas production mode to solve the faced problem.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the comprehensive drainage gas production system for the low-pressure low-yield well can effectively input drainage gas production media into a liquid accumulation section below a gas production surface so as to effectively improve the drainage gas production effect.
The technical scheme adopted for solving the technical problems is as follows: a comprehensive drainage gas production system for a low-pressure low-yield well comprises a gas production oil pipe capable of extending into a gas production surface of a shaft and an oil casing pipe sleeved outside the gas production oil pipe, and further comprises a multifunctional conveying device and a packer, wherein the tail end of the multifunctional conveying device capable of extending into the position below the gas production surface of the shaft penetrates through the gas production oil pipe, and a gap between the gas production oil pipe and one end, located at the gas production surface of the shaft, of the oil casing pipe is sealed through the packer; and the drainage gas production medium is used for removing the accumulated liquid below the gas production surface of the shaft of the low-pressure low-yield well, and is directly input into the accumulated liquid below the gas production surface under the coordination of the gas production oil pipe through the multifunctional conveying device.
The invention has the beneficial effects that: this application is through setting up one set of multi-functional conveyor and a packer to make the end can stretch into below the pit shaft gas production face multi-functional conveyor wear the cover and are in gas production oil pipe in, then pass through the packer will gas production oil pipe with the clearance that oil casing is located pit shaft gas production face one end is sealed up, in order to form one and use the gas production passageway that oil casing is main. Therefore, drainage gas production media for removing accumulated liquid below the gas production surface of the low-pressure low-yield well shaft, such as high-pressure gas for gas lift drainage gas production and foaming agent for foam drainage gas production can directly reach the accumulated liquid section of the well shaft through the multifunctional conveying device under the coordination of the gas production oil pipe. After the drainage gas production medium reaches the liquid accumulation section of the shaft, if the drainage gas production medium is high-pressure gas for gas lift drainage, the liquid accumulation deposited below the gas production surface of the shaft can be lifted and dispersed under the high-pressure condition, so that the liquid accumulation is changed into water drops with small volume and mass, and the purpose of being taken out of the shaft along with the produced gas flow is achieved; in a similar way, if the water drainage gas production medium is a foaming agent, the foaming agent directly entering the accumulated liquid can be mixed with the accumulated liquid, the accumulated liquid is refined, the purpose of bringing the gas flow out of the shaft along with the mining is achieved, and the water drainage gas production effect is effectively improved.
Further, the multifunctional conveying device comprises a continuous small oil pipe, the comprehensive drainage and gas production system further comprises a Christmas tree arranged at the mouth of the low-pressure low-yield well and a high-pressure natural gas storage tank connected with the Christmas tree, the gas production oil pipe is connected with the Christmas tree, and the continuous small oil pipe is connected with the high-pressure natural gas storage tank through the Christmas tree.
In a preferable mode of the above scheme, the comprehensive drainage gas production system further comprises a pressurization system comprising a CNG tank car and a booster pump, and the pressurization system is connected in parallel with the high-pressure natural gas storage tank at the input end of the coiled tubing through the Christmas tree.
Furthermore, a sand-casting nozzle is arranged at the tail end of the continuous small oil pipe.
Furthermore, the multifunctional conveying device also comprises a central oil pipe sleeved in the continuous small oil pipe in a penetrating manner, the comprehensive drainage and gas production system also comprises a foam row assembly, and the central oil pipe is connected with the foam row assembly through the Christmas tree; during foam discharging, the foaming agent stored in the foam discharging assembly directly reaches a liquid accumulation section of a wellbore through the central oil pipe under the cooperation of the Christmas tree.
The preferable mode of the scheme is that the foam row component comprises a foaming agent tank, a foaming quantitative pump and a foam row pry, the foaming agent tank and the foaming quantitative pump are both installed on the foam row pry, and the central oil pipe is connected with the foaming agent tank through the foaming quantitative pump.
Further, the comprehensive drainage gas production system further comprises a negative pressure suction device, and the negative pressure suction device is communicated with the gas production oil pipe through the Christmas tree.
The preferable mode of the above scheme is that the negative pressure suction device comprises a multi-cylinder pump, an injection pump, a horizontal tank and a suction pry, wherein the multi-cylinder pump, the injection pump and the horizontal tank are all mounted on the suction pry, an inlet of the injection pump is connected with an outlet of the multi-cylinder pump, and a negative pressure port of the injection pump is connected with an outlet throttle valve of the Christmas tree.
Furthermore, the comprehensive drainage gas production system also comprises a high-pressure gas-liquid sand separation device and a high-pressure gas-liquid separation device, wherein the high-pressure gas-liquid sand separation device and the high-pressure gas-liquid separation device are sequentially connected to the gas output end of the Christmas tree.
Drawings
FIG. 1 is a schematic diagram of the integrated water drainage and gas production system for a low pressure and low yield well according to the present invention.
Labeled as: the device comprises a gas production oil pipe 1, an oil casing 2, a multifunctional conveying device 3, a packer 4, a continuous small oil pipe 5, a low-pressure low-yield well mouth 6, a Christmas tree 7, a high-pressure natural gas storage tank 8, a sand-casting spray head 9, a central oil pipe 10, a foam row assembly 11, a foaming agent tank 12, a foaming constant delivery pump 13, a foam row pry 14, a negative pressure suction device 15, an injection pump 16, a horizontal tank 17, a suction pry 18, a multi-cylinder pump 19, a high-pressure gas-liquid-sand separation device 20, a high-pressure gas-liquid separation device 21, a booster pump 22 and a CNG tank car 23.
Detailed Description
As shown in fig. 1, the comprehensive water drainage and gas production system for low-pressure low-yield wells can effectively input water drainage and gas production media into a liquid accumulation section below a gas production surface so as to effectively improve the water drainage and gas production effects. Synthesize drainage gas production system including can stretch into gas production oil pipe 1 in the pit shaft gas production face and cup joint the oil casing 2 outside this gas production oil pipe 1, its characterized in that: the comprehensive drainage gas production system also comprises a multifunctional conveying device 3 and a packer 4, wherein the multifunctional conveying device 3 with the tail end capable of extending below the gas production surface of the shaft penetrates and is sleeved in the gas production oil pipe 1, and a gap between the gas production oil pipe 1 and one end, located at the gas production surface of the shaft, of the oil casing 2 is sealed through the packer 4; and a drainage gas production medium for removing the accumulated liquid below the gas production surface of the low-pressure low-yield well shaft is directly input into the accumulated liquid below the gas production surface through the multifunctional conveying device 3 under the coordination of the gas production oil pipe 1. This application is through setting up one set of multi-functional conveyor 3 and a packer 4 to make the end can stretch into below the pit shaft gas production face multi-functional conveyor 3 wear the cover and be in gas production oil pipe 1 in, then pass through packer 4 will gas production oil pipe 1 with the clearance that oil casing 2 is located pit shaft gas production face one end is sealed up, in order to form one and use oil casing to be the gas production passageway of giving first place to. Therefore, drainage gas production media for removing accumulated liquid below the gas production surface of the low-pressure low-yield well shaft, such as high-pressure gas for gas lift drainage gas production and foaming agent for foam drainage gas production can directly reach the accumulated liquid section of the well shaft through the multifunctional conveying device 3 under the coordination of the gas production oil pipe 1. After the drainage gas production medium reaches the liquid accumulation section of the shaft, if the drainage gas production medium is high-pressure gas for gas lift drainage, the liquid accumulation deposited below the gas production surface of the shaft can be lifted and dispersed under the high-pressure condition, so that the liquid accumulation is changed into water drops with small volume and mass, and the purpose of being taken out of the shaft along with the produced gas flow is achieved; in a similar way, if the water drainage gas production medium is a foaming agent, the foaming agent directly entering the accumulated liquid can be mixed with the accumulated liquid, the accumulated liquid is refined, the purpose of bringing the gas flow out of the shaft along with the mining is achieved, and the water drainage gas production effect is effectively improved.
In the above embodiment, with the progress of gas production technology and the application of a novel gas production pipeline, in order to simplify the structure of the multifunctional conveying device 3, facilitate manufacturing and installation, and more adopt the existing pipelines to avoid investment of new research and development costs, the multifunctional conveying device 3 of the present application includes a small continuous oil pipe 5, the integrated drainage gas production system further includes a christmas tree 7 arranged at the wellhead 6 of the low-pressure low-yield well and a high-pressure natural gas storage tank 8 connected with the christmas tree 7, the gas production oil pipe 1 is connected with the christmas tree 7, and the small continuous oil pipe 5 is connected with the high-pressure natural gas storage tank 8 through the christmas tree 7; in order to ensure the stability of the pressure of the high-pressure gas for forming the gas lift to the maximum extent, the comprehensive drainage gas production system further comprises a pressurizing system comprising a CNG tank car (23) and a booster pump 22, wherein the pressurizing system is connected with the high-pressure natural gas storage tank 8 in parallel at the input end of the continuous small oil pipe 5 through the Christmas tree 7. Like this, when the pressure of the gas in the high-pressure natural gas storage tank 8 is enough, can directly be used for gas lift gas production, works as when the pressure reduction of the gas in the high-pressure natural gas storage tank 8 is not enough effectual carry out gas lift gas production, can pass through the booster pump improve the pressure of input gas, guarantee the effective of going on of gas lift gas production. And correspondingly, in order to effectively discharge the deposited silt along with the airflow, a sand-casting nozzle 9 is arranged at the tail end of the continuous small oil pipe 5. Therefore, high-pressure gas can roll sand grains on a gas production surface through the injection of the sand-casting nozzle to be mixed with gas and liquid, and the sand grains are brought out of a wellhead at a high speed through the space between the continuous small oil pipe and the gas production oil pipe.
Further, in order to effectively and directly input the foaming agent into the accumulated liquid below the gas production surface of the shaft when foam drainage is adopted, the multifunctional conveying device 3 further comprises a central oil pipe 10 which is sleeved in the small continuous oil pipe 5 in a penetrating manner, the comprehensive drainage gas production system further comprises a foam drainage component 11, and the central oil pipe 10 is connected with the foam drainage component 11 through the Christmas tree 7; during the foam discharging process, the foaming agent stored in the foam discharging assembly 11 directly reaches the liquid accumulation section of the well bore through the central oil pipe 10 under the coordination of the Christmas tree 7. At this moment the preferred structure of the foam row assembly 11 does, the foam row assembly 11 include the foaming agent jar, 12 foaming constant delivery pump 13 and foam row sled 14, the foaming agent jar 12 with foaming constant delivery pump 13 all install the foam row sled 14 on, center oil pipe 10 pass through foaming constant delivery pump and 13 the foaming agent jar 12 be connected. Thus, the foaming agent stored in the foaming agent tank 12 can be directly input into the accumulated liquid below the gas production surface of the shaft under the coordination of the Christmas tree 7 and the central oil pipe 10 through the foaming metering pump 13, and then the gas, the bubbles and the liquid which can be brought out of the shaft along with the gas flow are formed in the accumulated liquid and are discharged out of the shaft along with the gas flow, so that the purpose of discharging the bubbles is achieved.
Meanwhile, in order to form a comprehensive drainage gas production technology and discharge accumulated liquid below the gas production surface of a shaft to the maximum extent, the comprehensive drainage gas production system further comprises a negative pressure suction device 15, and the negative pressure suction device 15 is communicated with the gas production oil pipe 1 through the Christmas tree 7. At this time, the negative pressure suction device 15 comprises a multi-cylinder pump (19), an injection pump 16, a horizontal tank 17 and a suction pry 18, wherein the multi-cylinder pump (19), the injection pump 16 and the horizontal tank 17 are all mounted on the suction pry 18, an inlet of the injection pump 16 is connected with an outlet of the multi-cylinder pump 19, an outlet of the injection pump 16 is connected with a high-pressure gas-liquid-sand separation device 20, and a negative pressure port of the injection pump 16 is connected with an outlet throttle valve of a Christmas tree. Thus, a negative pressure environment can be formed at the gas production surface of the gas production oil pipe 1 through the negative pressure suction device 15, so that gas, sand and liquid at the bottom of the well can be sucked out together, mixed with the liquid of the jet pump and discharged together through a pipeline.
Further, in order to improve the quality of the output gas, the comprehensive drainage gas production system further comprises a high-pressure gas-liquid sand separation device 20 and a high-pressure gas-liquid separation device 21, wherein the high-pressure gas-liquid sand separation device 20 and the high-pressure gas-liquid separation device 21 are sequentially connected to the gas output end of the Christmas tree 7. Therefore, the produced gas passes through the high-pressure gas-liquid sand separation device 20 and the high-pressure gas-liquid separation device 21 to respectively and sequentially separate sand grains and water in the produced gas, and the quality of the output gas is ensured.
The working principle of the composite mining and discharging system is as follows:
1. gas lift drainage gas recovery: a small continuous oil pipe 5 is added in the gas production oil pipe 1 and is directly inserted into the well bottom gas production surface. The oil casing 2 and the gas production tubing 1 are sealed off with a packer 4. The other end of the coiled small oil pipe 5 is connected with a gas lift pry and a booster pump 22. When the natural gas pressure of the gas lift pry meets the gas lift pressure, the natural gas in the tank can be directly utilized to carry out gas lift to the bottom of the well through the continuous small oil pipe 5. If the natural gas in the tank does not meet the gas lift requirement, the natural gas can be pressurized by the booster pump 22 and then is lifted to the bottom of the well through the coiled tubing 5. The front part of the booster pump 22 is also connected in parallel with a natural gas storage tank, and when in normal production, the gas in the natural gas storage tank can be used for gas lift after being pressurized by the booster pump when a well head produces certain natural gas.
2. Foam drainage and gas production: the central oil pipe 10 is directly inserted into the bottom of the well, foaming agent is fed into the central oil pipe 10 in the continuous small oil pipe 5 from the dosing nozzle according to a certain proportion by a proportion pump and is input into the gas production surface, and the foaming agent is mixed with gas and water in the well to generate foam. The specific gravity of a liquid column between the oil casing and the continuous small oil pipe is reduced, and foam drainage and gas recovery are realized.
3. Sand washing: the front end of the continuous small oil pipe is provided with a sand-casting nozzle. During gas lifting, gas is sprayed through the nozzle, so that sand grains on the gas production surface roll and are mixed with gas and liquid, and the gas is brought out of a well mouth at a high speed through the space of the continuous small oil pipe and the gas production oil pipe.
4. Negative pressure suction drainage gas production: the liquid in the horizontal tank passes through the jet pump at high speed under the action of the multi-cylinder pump, and a negative pressure is generated at a suction inlet of the jet pump. When the valve of the wellhead Christmas tree is opened, the wellhead oil production pipe is communicated with the suction inlet of the jet pump. The gas, sand and liquid at the bottom of the well are sucked out under the action of negative pressure, mixed with the liquid of the jet pump and discharged together through a pipeline.
The application has the advantages that: the foam drainage agent is injected into the accumulated liquid section through ground matched equipment and a continuous small oil pipe, the foam drainage agent generates foam in a shaft under the action of stirring of fluid in the shaft by utilizing ground equipment, namely a foam drainage assembly, the liquid density is reduced, the surface tension of the liquid and the slippage loss of gas are reduced, the liquid carrying capacity of the gas is improved, and meanwhile, comprehensive processes such as gas lift, negative pressure suction and the like are applied, so that the accumulated liquid in the shaft is effectively reduced, and the gas yield of a gas well is improved. The method can effectively solve the problem of bottom hole liquid accumulation of a plurality of types of water-producing gas wells, meet the technical requirements of gas field development processes, form a gas field development drainage gas production matching technology, simultaneously solve the problems that the conventional foam, discharge and injection foaming agent cannot directly reach a shaft liquid accumulation section, the foaming agent is difficult to inject and long in time consumption, and simultaneously utilize a suction inlet to generate negative pressure when the injection pump is used for injecting, so that mixed liquid in a shaft is sucked out and sent into a conveying pipeline to be discharged.

Claims (4)

1. The utility model provides a synthesize drainage gas production system for low pressure low yield well, includes gas production oil pipe (1) that can stretch into in the pit shaft gas production face and cup joints oil casing pipe (2) outside this gas production oil pipe (1), its characterized in that: the comprehensive drainage gas production system also comprises a multifunctional conveying device (3) and a packer (4), wherein the tail end of the multifunctional conveying device (3) can extend into the position below the gas production surface of the shaft and is sleeved in the gas production oil pipe (1), and a gap between the gas production oil pipe (1) and one end, located at the gas production surface of the shaft, of the oil casing (2) is sealed through the packer (4); the drainage gas production medium is used for removing the accumulated liquid below the gas production surface of the shaft of the low-pressure low-production well, the drainage gas production medium is directly input into the accumulated liquid below the gas production surface under the coordination of the gas production oil pipe (1) through the multifunctional conveying device (3), the multifunctional conveying device (3) comprises a continuous small oil pipe (5), the comprehensive drainage gas production system further comprises a Christmas tree (7) arranged at the wellhead (6) of the low-pressure low-production well and a high-pressure natural gas storage tank (8) connected with the Christmas tree (7), the gas production oil pipe (1) is connected with the Christmas tree (7), the continuous small oil pipe (5) is connected with the high-pressure natural gas storage tank (8) through the Christmas tree (7), a sand-turning spray head (9) is further arranged at the tail end of the continuous small oil pipe (5), and the multifunctional conveying device (3) further comprises a central oil pipe (10) sleeved in the continuous small oil pipe (5), the comprehensive water drainage and gas production system further comprises a foam drainage assembly (11), and the central oil pipe (10) is connected with the foam drainage assembly (11) through the Christmas tree (7); during foam discharging, the foaming agent stored in the foam discharging assembly (11) passes through the central oil pipe (10) and directly reaches a wellbore liquid accumulation section under the cooperation of the Christmas tree (7),
the foam row component (11) comprises a foaming agent tank (12), a foaming quantitative pump (13) and a foam row pry (14), the foaming agent tank (12) and the foaming quantitative pump (13) are both installed on the foam row pry (14), the central oil pipe (10) is connected with the foaming agent tank (12) through the foaming quantitative pump (13),
the comprehensive drainage gas production system further comprises a high-pressure gas-liquid sand separation device (20) and a high-pressure gas-liquid separation device (21), wherein the high-pressure gas-liquid sand separation device (20) and the high-pressure gas-liquid separation device (21) are sequentially connected to the gas output end of the Christmas tree (7).
2. The integrated drainage gas recovery system for low pressure low producing wells of claim 1, wherein: the comprehensive water drainage gas production system also comprises a pressurization system comprising a CNG tank car (23) and a booster pump (22), wherein the pressurization system is connected with the high-pressure natural gas storage tank (8) in parallel at the input end of the continuous small oil pipe (5) through the Christmas tree (7).
3. An integrated drainage gas recovery system for low pressure low producing wells according to claim 1 or 2 wherein: the comprehensive drainage gas production system further comprises a negative pressure suction device (15), and the negative pressure suction device (15) is communicated with the gas production oil pipe (1) through the Christmas tree (7).
4. The integrated drainage gas recovery system for low pressure low producing wells of claim 3, wherein: negative pressure suction device (15) include multicylinder pump (19), jet pump (16), horizontal jar (17) and suction sled (18), multicylinder pump (19), jet pump (16) and horizontal jar (17) all install suction sled (18) on, the entry of jet pump (16) links to each other with the export of multicylinder pump (19), the negative pressure mouth of jet pump (16) is associative with the export choke valve of christmas tree (7).
CN201610615994.7A 2016-07-29 2016-07-29 Comprehensive drainage gas production system for low-pressure low-yield well Active CN106050198B (en)

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CN108843276A (en) * 2018-06-12 2018-11-20 中国石油天然气股份有限公司 Casing deformation well involving swab method

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CN102747993A (en) * 2012-06-27 2012-10-24 中国石油大学(华东) Liquid foaming agent injection method
RU2506421C1 (en) * 2012-08-07 2014-02-10 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Development method of bottom-hole zone
CN203022700U (en) * 2012-12-27 2013-06-26 中国石油集团川庆钻探工程有限公司 Mechanical pumping-speed tube composite drainage gas recovery device
CN203257380U (en) * 2013-04-28 2013-10-30 河北华北石油荣盛机械制造有限公司 Novel coal bed gas discharging and extracting device
CN205823251U (en) * 2016-07-29 2016-12-21 南充西南石油大学设计研究院有限责任公司 Comprehensive draining gas production system for low-voltage and low-yield well

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