CN110318711B - Liquid draining method and device for liquid-containing low-yield oil-gas well - Google Patents

Liquid draining method and device for liquid-containing low-yield oil-gas well Download PDF

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CN110318711B
CN110318711B CN201910622444.1A CN201910622444A CN110318711B CN 110318711 B CN110318711 B CN 110318711B CN 201910622444 A CN201910622444 A CN 201910622444A CN 110318711 B CN110318711 B CN 110318711B
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gas
liquid
pressure
separation tank
oil
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CN110318711A (en
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任晓辉
李慧
贺玮玮
梁刚
马忠良
刘小婷
秦炳甲
葛坚
李永康
黄超伟
包方芳
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Henan Diesel Engine Industry Co Ltd
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Henan Diesel Engine Industry Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B43/34—Arrangements for separating materials produced by the well
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

The invention belongs to the technical field of natural gas exploitation of oil and gas fields, and particularly relates to a liquid-containing oil and gas well liquid discharging method and device, and the liquid-containing low-yield oil and gas well liquid discharging device is arranged on a connecting pipeline between a wellhead gas production tree and a gas gathering and transportation pipeline of a gas gathering station; the liquid discharging device is provided with a gas-liquid separation tank; the gas-liquid separation tank is internally provided with liquid, and the inner cavity of the gas-liquid separation tank is divided into a gas oil cavity and a liquid cavity by the liquid level of the liquid; an oil gas inlet of the oil gas cavity is communicated with an oil gas collecting main pipe; the gas production main pipe is communicated with a wellhead gas production tree; a liquid outlet I of the liquid cavity is communicated with the liquid storage cavity of the gas-liquid isolation tank; the gas-liquid separation tank is also provided with an oil-gas bypass port corresponding to the oil-gas cavity; the oil gas bypass port is communicated with the conveying main pipe; the invention carries out oil-gas separation and discharge control on the accumulated liquid in the shaft of the liquid-containing oil-gas well on the well; the capability of carrying underground effusion by natural gas in the oil-gas well shaft is ensured.

Description

Liquid draining method and device for liquid-containing low-yield oil-gas well
Technical field
The invention belongs to the technical field of natural gas exploitation of oil and gas fields, and particularly relates to a method and a device for draining a liquid-containing oil and gas well, which can be used for draining a natural gas-containing low-yield oil and gas well, can also be applied to the yield increase of a natural gas-containing low-yield oil and gas well, and can be popularized and applied to the recovery of natural gas from the aspect of market application.
Background
In the field of natural gas exploitation of oil and gas fields, the main method at present is to produce oil gas by means of downhole pressure self-injection; as is known in the art, condensate and water inevitably exist downhole in oil and gas wells, and the production process is in a gas-liquid two-phase flow form. In the initial stage of oil gas well production, the pressure and flow rate of natural gas in a shaft of the oil gas well are high, a large amount of condensate oil and water in the shaft are carried to the well by the natural gas, and under the action of high wellhead pressure, the natural gas carries the condensate oil and water to enter a gathering and conveying pipeline to a gas gathering station; by the end of the production of the oil-gas well, the pressure of natural gas in the oil-gas well shaft is low due to the fact that formation pressure is reduced, the flow rate is low, the capacity of carrying downhole condensate oil and water in the oil-gas well shaft is gradually reduced, part of condensate oil and water in the shaft is carried to the well by the natural gas, pipeline resistance generated in a gathering and conveying pipeline by the condensate oil and water carried to the well by the natural gas is caused to reduce the conveying capacity of the conveying pipeline to a gas gathering station, the flow rate of the natural gas in the oil-gas well shaft is further reduced, the other part of condensate oil and water is deposited in a vertical shaft to form a liquid product, the liquid product is gradually increased in the shaft to enable the pressure of the oil-gas well head to be continuously reduced to be a low-yield well, and when the conveying pressure of the oil-gas well head is lower than the pressure of the gathering and conveying pipeline entering the gas gathering and conveying station, the phenomenon restricts the sustainable development of the oil-gas well. In order to improve the liquid discharging capability of the liquid-containing low-yield oil-gas well, various inventions and novel technologies are provided at home and abroad, and the liquid-containing low-yield natural gas oil-gas well is applied by combining a long-term well closing boosting and short-term well opening production method.
In the prior patent, a downhole choke (application number 201610511843.7) is a method for putting the choke into the well, so that hydrate blockage is prevented from forming in the well shaft, and the purpose of improving the self-gas yield of an oil-gas well is achieved; the method for increasing the production of the oil well by combining gel foam and in-situ microemulsion (application number 2018103787887. X) is a method for injecting foam into the oil well, emulsifying the accumulated liquid in the well to reduce the density and specific gravity, pushing out the accumulated liquid by virtue of the underground air pressure, improving the self-gas production of the oil well and reducing the water production of the oil well; the closed gas-lift liquid-discharge combined pipe column (application number 201320671613.9) of the low-pressure oil-gas well is characterized in that the underground long-distance accumulated liquid is enabled to be small-section blocking to avoid accumulated liquid by throwing equipment into the underground and utilizing the characteristic of unidirectional flow of a check valve, and the self gas yield of the oil-gas well is ensured by a method of pushing the accumulated liquid out by virtue of underground gas pressure; in the drainage and production increasing device of the intelligent gas well (application number 201510476076.6), natural gas mixed in drainage and production water is separated and input into a gas production pipeline in a drainage and production water system of a natural gas well, so that the natural gas is prevented from entering an atmosphere, and the oil production of an oil well is improved.
The method for salvaging the objects put into the well is provided by an oil well salvaging device (application number 201721239906.4) while the liquid-containing low-yield natural gas oil well drainage method is provided, and is used for preventing the put into the well from falling off the structure body in the salvaging and lifting process when the objects put into the well are maintained, so that the working efficiency of salvaging the objects put into the well is improved.
Therefore, the technology for discharging the accumulated liquid in the oil and gas well shaft by throwing the object or the medium into the oil and gas well shaft with low liquid yield is unfavorable for popularization and application due to the reasons of high cost of throwing equipment, high pollution of throwing medium, complex throwing process, unchanged maintenance and the like.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method and a device for discharging liquid from a liquid-containing low-yield oil-gas well, which can ensure that natural gas in a shaft of the oil-gas well carries underground liquid accumulation capacity, separate and discharge the liquid accumulated on the shaft of the oil-gas well to a gas gathering station gathering and transportation pipeline, complete liquid discharge from the liquid-containing low-yield oil-gas well and yield increase of the low-yield oil-gas well, and are safe, reliable, environment-friendly, energy-saving, easy to implement, convenient to maintain and beneficial to popularization.
The invention accomplishes the task of the invention by the following technical scheme:
The liquid discharging device of the liquid-containing low-yield oil-gas well is arranged on a connecting pipeline between a wellhead gas production tree and a gas gathering and transportation pipeline of a gas gathering station; the liquid discharging device is provided with a gas-liquid separation tank; the gas-liquid separation tank is internally provided with liquid, and the inner cavity of the gas-liquid separation tank is divided into a gas oil cavity and a liquid cavity by the liquid level of the liquid; an oil-gas inlet of the oil cavity of the gas-liquid separation tank is communicated with an oil-gas collecting main pipe; the gas production main pipe is communicated with the wellhead gas production tree; a liquid outlet I of the liquid cavity of the gas-liquid separation tank is communicated with the liquid storage cavity of the gas-liquid separation tank, and a pneumatic control stop valve and a one-way valve I are arranged between the liquid outlet I and the liquid storage cavity; the gas-liquid separation tank is also provided with an oil-gas bypass port corresponding to the gas-oil cavity; the oil gas bypass port is communicated with the conveying main pipe; the oil gas outlet of the gas-liquid separation tank is connected with the oil gas cavity of the gas-liquid separation tank;
the inside of the gas-liquid isolation tank is sequentially divided into a pure air cavity, an oil air cavity and a liquid storage cavity from top to bottom; the pure air cavity and the oil-gas cavity are isolated by adopting a mist catcher, and the oil-gas cavity and the liquid storage cavity are two cavities which are isolated in a sealing way;
the circumference of the pure air cavity is provided with an air outlet I and an air exhaust port II; the air outlet I is communicated with an air extraction opening of the air extracting and pressing device, the air outlet II of the air extracting and pressing device is connected to the air inlet II of the cooler through a high-pressure air pipe, and the air outlet III of the cooler is connected to the conveying main pipe; the circumference of the oil gas cavity is provided with an air inlet I, a low-pressure air port and a mounting port I, and the air inlet I is communicated with an oil gas outlet of the gas-liquid separation tank; the low-pressure air port is connected to an outlet B of the pneumatic control three-way valve; the circumference of the liquid storage cavity is provided with a liquid inlet, a high-pressure air port, a liquid outlet II and a mounting port II; the liquid inlet is connected to a liquid outlet I of the gas-liquid separation tank through a pipeline, a one-way valve and a pneumatic control stop valve, the high-pressure air inlet is connected to an air inlet A of the pneumatic control three-way valve, and the liquid outlet II is communicated with the conveying main pipe; the mounting port I of the oil air cavity is communicated with the mounting port II of the liquid storage cavity;
The liquid discharge device is also provided with a high-pressure air tank; the circumference of the high-pressure gas tank is provided with a gas inlet III, a control gas inlet, a gas outlet IV and a charging and discharging port; the air inlet III is connected to the air outlet III of the cooler, and the control air inlet is divided into three pipelines through a control air pipe: the pipeline I is connected to a liquid level control valve I arranged on the liquid storage cavity of the gas-liquid separation tank, the liquid level control valve I is connected to a pneumatic control port K of the pneumatic control three-way valve, the pipeline II is connected to a reversing port C of the pneumatic control three-way valve, the pipeline III is connected to a liquid level control valve II arranged on the gas-liquid separation tank, and the liquid level control valve II is connected to a pneumatic control port S of the pneumatic control stop valve; the gas outlet IV is connected to a gas cut-off valve on the natural gas engine; the charging and discharging port is connected with a gas transmission pipeline; an inlet A of the pneumatic control three-way valve is communicated with a high-pressure air port of the gas-liquid isolation tank; the liquid level control valve I is communicated when the liquid level of the liquid in the liquid storage cavity of the gas-liquid isolation tank is high, high-pressure gas from a control gas port of the high-pressure gas tank acts on the pneumatic control port K of the pneumatic control three-way valve through the pipeline I of the control gas pipe and the liquid level control valve I to enable the inlet A and the reversing port C of the pneumatic control three-way valve to be communicated, the liquid level control valve is blocked when the liquid level of the liquid storage cavity of the gas-liquid isolation tank is low, and the pneumatic control port K of the pneumatic control three-way valve loses high-pressure acting gas to enable the inlet A and the outlet B to be communicated; the liquid level control valve II is cut off when the liquid level in the gas-liquid separation tank is low; liquid in the gas-liquid separation tank is discharged to the liquid storage cavity in batches under the control of the liquid level control valve II and the action of natural gas pressure in the tank, and the liquid in the liquid storage cavity is divided into a plurality of times to be discharged to the conveying main pipe;
The pneumatic control stop valve is provided with an inlet A, an outlet B and a pneumatic control port S; the inlet A is connected to a liquid outlet of the gas-liquid separation tank through a pipeline, and the outlet B is communicated with a liquid inlet of the gas-liquid separation tank through a one-way valve; the pneumatic control port S liquid discharging device is communicated with a pipeline III of the control port; the pneumatic control port S of the pneumatic control stop valve loses high-pressure acting gas to stop the inlet A and the outlet B.
The oil gas bypass port is connected to the conveying main pipe through a one-way valve II, a manual stop valve I and a gas conveying pipeline.
The top of gas-liquid separation jar be provided with emptying port I, the bottom is provided with the drain.
A one-way valve III is arranged between the air outlet of the cooler and the conveying main pipe and used for ensuring that gas or liquid in the conveying main pipe cannot flow back into the air outlet of the cooler.
And a one-way valve V is arranged behind the liquid outlet of the liquid storage cavity of the gas-liquid isolation tank and is used for ensuring that natural gas and liquid in the conveying main pipe cannot flow backwards into the liquid storage cavity of the gas-liquid isolation tank.
The liquid-containing low-yield oil-gas well liquid discharging method comprises the steps that after a gas collecting main pipe is connected with a wellhead gas collecting tree, a conveying main pipe is connected with a gas collecting and conveying pipeline of a gas collecting station, the liquid discharging device performs oil-gas separation and discharging control on accumulated liquid in a shaft of the liquid-containing oil-gas well on the shaft, performs pumping and yield increasing conveying control on the low-yield oil-gas well, and completes liquid discharging of the liquid-containing low-yield oil-gas well and yield increasing of the low-yield oil-gas well; the specific method comprises the following steps:
The gas-liquid separation tank is used for collecting and separating multi-liquid-accumulation carried to the well by natural gas in the oil-gas well shaft, the separated natural gas is conveyed to the conveying main pipe through the gas-liquid separation tank, the multi-liquid-accumulation carried to the oil-gas well shaft is batched and discharged to the gas-liquid separation tank through the gas-liquid separation tank, and the multi-liquid-accumulation is divided into a plurality of times and is discharged to the conveying main pipe through the gas-liquid separation tank, and the multi-liquid-accumulation is carried and discharged to the gas collecting and conveying pipeline of the gas collecting station along with the natural gas entering the conveying main pipe; after the gas collecting main pipe is connected with the wellhead gas collecting tree, the oil gas inlet of the gas-liquid separation tank is communicated with the shaft of the liquid-containing oil gas well through the gas collecting main pipe and the wellhead gas collecting tree; when the conveying pressure of the gas production tree of the oil gas wellhead is higher than the pressure of a gathering and conveying pipeline of the gathering and conveying station, a manual stop valve I is opened, and a gas-liquid mixture formed by accumulated liquid and natural gas in a shaft of the liquid-containing oil gas well enters the tank through the gas inlet of the gas production tree, the gas production main pipe and the gas-liquid separation tank; the liquid separated by the gas-liquid separation tank is stored at the bottom of the tank, the high-pressure natural gas of the oil-gas well separated by the gas-liquid separation tank is conveyed to a gas collecting station collecting and conveying pipeline through a conveying main pipe after entering a one-way valve III through the gas-liquid separation tank and a gas conveying pipeline, and the production work of conveying the natural gas when the conveying pressure of a gas collecting tree at the wellhead of the oil-gas well containing the liquid is higher than the pressure of the gas collecting and conveying pipeline of the gas collecting station is completed; in the process that the high-pressure natural gas of the oil gas well is conveyed to a conveying main pipe from an oil gas bypass port of a gas-liquid separation tank, a manual stop valve II is opened, the high-pressure natural gas enters the high-pressure gas tank from a gas filling port of the high-pressure gas tank through the oil gas bypass port of the gas-liquid separation tank, a one-way valve II, a manual stop valve I and a gas conveying pipeline, and is separated into three pipelines from a control gas port of the high-pressure gas tank to convey the high-pressure gas outwards through a control gas pipe: the liquid level control valve I is conveyed to a liquid storage cavity of the gas-liquid separation tank through a pipeline I, the liquid level control valve I is conveyed to a reversing port C of the pneumatic control three-way valve through a pipeline II, and the liquid level control valve II is conveyed to a liquid level control valve II arranged on the gas-liquid separation tank through a pipeline III; when the liquid level of the liquid stored in the bottom of the gas-liquid separation tank is high, a liquid level control valve II arranged on the gas-liquid separation tank is communicated, high-pressure gas from a control gas port of the high-pressure gas tank acts on a pneumatic control port S of a pneumatic control stop valve through a control gas pipe III and the liquid level control valve II, so that an inlet A and an outlet B of the pneumatic control stop valve are communicated, and liquid in the gas-liquid separation tank is discharged from a liquid inlet of the gas-liquid separation tank to a liquid storage cavity of the gas-liquid separation tank through a liquid outlet of the gas-liquid separation tank, an inlet A and an outlet B of the pneumatic control stop valve and a one-way valve I under the action of natural gas pressure in the tank; when the liquid level of the liquid storage cavity of the gas-liquid isolation tank is high, a liquid level control valve I arranged on the liquid storage cavity of the gas-liquid isolation tank is communicated, high-pressure gas from a control gas port of the high-pressure gas tank acts on a pneumatic control port K of the pneumatic control three-way valve through a control gas pipe I and a liquid level control valve I to enable a pneumatic control three-way inlet A to be communicated with a reversing port C, high-pressure gas from the control gas port of the high-pressure gas tank enters the liquid storage cavity of the gas-liquid isolation tank through a control gas pipe II, the reversing port C of the pneumatic control three-way valve and the inlet A, and liquid in the liquid storage cavity of the gas-liquid isolation tank is discharged to a conveying main pipe behind the one-way valve III from the liquid outlet of the liquid storage cavity of the gas-liquid isolation tank through a pipeline and a one-way valve V25 under the pressure effect of the high-pressure gas in the control gas pipe II; the one-way valve IV is arranged between the interface of the oil gas cavity and the interface of the liquid storage cavity and is used for ensuring that high-pressure gas in the liquid storage cavity of the gas-liquid isolation tank cannot flow back into the oil gas cavity of the gas-liquid isolation tank; the one-way valve I is used for ensuring that liquid in a liquid storage cavity of the gas-liquid separation tank cannot flow back into the gas-liquid separation tank when the liquid is discharged to the conveying main pipe during the conduction period of the inlet A and the outlet B of the pneumatic control stop valve; when the liquid level of the liquid stored in the bottom of the gas-liquid separation tank is low, a liquid level control valve II arranged on the gas-liquid separation tank is cut off, gas in a pipeline III from a control gas pipe of a control gas port of the high-pressure gas tank cannot enter a pneumatic control port S of the pneumatic control stop valve through the liquid level control valve II, so that an inlet A and an outlet B of the pneumatic control stop valve are cut off, a liquid outlet of the gas-liquid separation tank is not communicated with a liquid inlet of a liquid storage cavity of the gas-liquid separation tank, and the fact that natural gas in the gas-liquid separation tank cannot enter the liquid storage cavity of the gas-liquid separation tank is ensured; when the liquid in the liquid storage cavity of the gas-liquid isolation tank is discharged to the conveying main pipe, the liquid level in the liquid storage cavity of the gas-liquid isolation tank is reduced, so that a liquid level control valve I arranged on the liquid storage cavity of the gas-liquid isolation tank is cut off, gas in a pipeline I of a control air pipe from a control air port of the high-pressure gas tank cannot enter a pneumatic control port K of the pneumatic control three-way valve through the liquid level control valve I, an inlet A and a reversing port C of the pneumatic control three-way valve are cut off, the reversing is conducted to the inlet A and the outlet B of the pneumatic control three-way valve, high-pressure gas in a pipeline II of the control air pipe does not enter the liquid storage cavity of the gas-liquid isolation tank through the inlet A and the reversing port C of the pneumatic control three-way valve, the high-pressure gas stored in the liquid storage cavity of the gas-liquid separation tank is discharged to the oil-gas cavity low-pressure gas port of the gas-liquid separation tank through the high-pressure gas port, the pneumatic control three-way valve inlet A and the pneumatic control three-way valve outlet B, so that the pressure in the liquid storage cavity of the gas-liquid separation tank is reduced, when the pressure in the liquid storage cavity is lower than the pressure in the gas-liquid separation tank, the liquid in the gas-liquid separation tank is discharged to the liquid storage cavity of the gas-liquid separation tank again under the control of the liquid level control valve II and under the action of the natural gas pressure in the tank, the liquid discharge operation is stopped until the liquid level in the liquid storage cavity of the gas-liquid separation tank is not high, and the liquid batch discharge of the liquid in the liquid storage cavity of the gas-liquid separation tank to the liquid storage cavity of the gas-liquid separation tank is completed and the liquid in batches is discharged to the conveying header pipe for multiple times; the liquid entering the conveying main pipe is carried by the natural gas entering the conveying main pipe from the oil gas bypass port of the gas-liquid separation tank and is discharged to the collecting and conveying pipeline of the gas collecting and conveying station, so that the conveying pressure in the collecting and conveying pipeline of the gas collecting and conveying station is reduced, the capability of carrying the underground liquid accumulation of the natural gas in the oil gas well shaft is ensured, and the purpose of controlling the oil-gas separation and discharge of the liquid accumulation in the oil gas well shaft containing the liquid is achieved; manually opening a manual stop valve connected with a drain outlet of the gas-liquid separation tank, and discharging liquid of the gas-liquid separation tank to a liquid conveying vehicle under the action of natural gas pressure in the tank so as to facilitate manual collection of the liquid; the emptying port of the gas-liquid separation tank is connected with a high-pressure emptying valve for protecting the safety of the gas-liquid separation tank; the emptying port of the pure air cavity of the gas-liquid isolation tank is connected with a low-pressure emptying valve for protecting the safety of the gas-liquid isolation tank; a pressure reducing and stabilizing valve is arranged between the natural gas engine and the high-pressure gas tank and is used for ensuring the stability of fuel required by the operation of the natural gas engine;
When the conveying pressure of the oil gas wellhead gas production tree is lower than the pressure of a gas collecting and conveying pipeline of a gas collecting and conveying station, natural gas of the oil gas wellhead gas production tree cannot enter a conveying main pipe through a gas-liquid separation tank to be conveyed to the gas collecting and conveying pipeline of the gas collecting and conveying station, and a one-way valve II is arranged behind a liquid outlet of the gas-liquid separation tank and is used for ensuring that natural gas and liquid in the conveying main pipe cannot flow back into the liquid separation tank; in order to realize pumping, pressure increasing and conveying control on a low-yield oil and gas well, a manual stop valve II is opened at the moment, natural gas in a conveying main pipe is inflated to a high-pressure gas tank from an inflation opening of the high-pressure gas tank through a gas transmission pipeline and the manual stop valve II, and the natural gas entering the high-pressure gas tank is used for providing starting fuel for a natural gas engine; the natural gas in the gas-liquid separation tank is immediately replenished to the pure air cavity, so that the natural gas in the gas-liquid cavity is reduced, the natural gas in the gas-liquid separation tank is replenished to the gas-liquid cavity through the gas outlet, the pressure reducing valve and the gas inlet of the gas-liquid separation tank, and a gas-liquid mixture formed by the accumulated liquid and the natural gas in a well bore of the liquid-containing gas-liquid separation tank is carried onto the gas-liquid well and is replenished to the gas-liquid separation tank through a gas collecting tree, a gas collecting main pipe and a gas-liquid separation tank gas-gas inlet, liquid and low-pressure natural gas are separated from the gas-liquid separation tank, and the low-pressure natural gas is reduced from the outlet through the pipeline and the pressure reducing valve and then enters the gas-liquid separation tank cavity from the gas-gas cavity gas inlet of the gas-liquid separation tank to form a gas-liquid-gas separation tank cavity through the gas-gas outlet and the pressure reducing valve after the natural gas in the gas-liquid separation tank is replenished to the gas-gas cavity through the gas-gas outlet and the gas-liquid-gas-liquid separation tank gas-gas inlet, and the gas-liquid mixture is separated into a gas-liquid-containing gas cavity and a gas-containing gas-liquid and a low-pressure natural gas trap between the gas-gas cavity and a gas-containing gas cavity; the liquid enters a liquid storage cavity of the gas-liquid isolation tank through the one-way valve IV = storage, mist liquid carried in the natural gas is separated by mist catching materials and falls into the bottom of an oil air cavity, pure low-pressure natural gas enters the pure air cavity of the gas-liquid isolation tank and enters an extraction opening of the pumping device through the air outlet and the low-pressure air pipe, so that safe operation of the pumping device is ensured, high-temperature high-pressure natural gas with pressure higher than the pressure of a gas collecting and conveying pipeline of a gas collecting and conveying station is output from the air outlet of the pumping device under the pumping action of the pumping device, enters an air inlet of a cooler through the high-pressure air pipe, is cooled into high-pressure low-temperature natural gas through the cooler, enters a conveying main pipe from the air outlet of the cooler and is conveyed to the gas collecting and conveying pipeline of the gas collecting and conveying station; a small amount of high-pressure low-temperature natural gas cooled by the cooler continuously enters the high-pressure gas tank through the gas inlet of the high-pressure gas tank after being stabilized by the pressure stabilizing valve, and becomes fuel required by continuous operation of the natural gas engine after passing through the pipeline and the pressure reducing and stabilizing valve through the gas outlet of the high-pressure gas tank, so that the natural gas engine is not influenced by the wellhead pressure change of the gas extraction tree of the oil gas wellhead, and the continuous pumping natural gas yield increasing work of the pumping device is ensured; the natural gas entering the high-pressure gas tank is further divided into three pipelines from a control gas port of the high-pressure gas tank through a control gas pipe to convey the high-pressure gas outwards: the liquid is conveyed to a liquid level control valve I through a pipeline I, is conveyed to a reversing port C of a pneumatic control three-way valve through a pipeline II, and is conveyed to a liquid level control valve II through a pipeline III; when the liquid level of the liquid at the bottom of the gas-liquid separation tank is high, a liquid level control valve II is communicated, high-pressure gas from a control gas port of the high-pressure gas tank acts on a pneumatic control port S of the pneumatic control stop valve through a pipeline III, the liquid level control valve II enables an inlet A and an outlet B of the pneumatic control stop valve to be communicated, the liquid of the gas-liquid separation tank is communicated under the action of natural gas pressure in the tank, the high-pressure gas from the control gas port of the high-pressure gas tank is discharged to a liquid storage cavity of the gas-liquid separation tank through a liquid outlet, the pneumatic control stop valve inlet A and the outlet B and a one-way valve I of the gas-liquid separation tank, when the liquid level in the liquid storage cavity of the gas-liquid separation tank is high, the liquid level control valve I arranged on the liquid storage cavity of the gas-liquid separation tank is communicated, the high-pressure gas from the control gas port of the high-pressure gas tank acts on a pneumatic control port K of the pneumatic control three-way valve through the pipeline I and the liquid level control valve I, the inlet A and the reversing port C of the pneumatic control three-way valve are communicated, the high-pressure gas from the control port C of the pneumatic control three-way valve enters the reversing cavity A through the pipeline II, and the liquid in the reversing cavity of the liquid storage cavity is discharged to the main pipe under the action of the high pressure;
When the liquid level of the liquid stored in the tank bottom of the gas-liquid separation tank is low, the liquid level control valve II is cut off, gas in the pipeline III cannot enter the pneumatic control port S of the pneumatic control stop valve through the liquid level control valve II, so that the inlet A and the outlet B of the pneumatic control stop valve are cut off, the liquid outlet of the gas-liquid separation tank is not communicated with the liquid inlet of the liquid storage cavity 8U, and the natural gas in the gas-liquid separation tank cannot enter the liquid storage cavity of the gas-liquid separation tank; when the liquid in the liquid storage cavity is discharged to the conveying main pipe, the liquid level in the liquid storage cavity is reduced, the liquid level control valve I is cut off, gas in the liquid storage cavity cannot enter the pneumatic control port of the pneumatic control three-way valve through the liquid level control valve I, the port A and the reversing port C of the pneumatic control three-way valve are cut off, the reversing is conducted to the inlet A and the outlet B of the pneumatic control three-way valve, the high-pressure gas in the pipeline II does not enter the liquid storage cavity through the inlet A and the reversing port C of the pneumatic control three-way valve, the stored high-pressure gas in the liquid storage cavity is discharged to the low-pressure gas port of the oil gas cavity through the high-pressure gas port, the inlet A and the outlet B of the pneumatic control three-way valve, the pressure in the liquid storage cavity is reduced, and when the pressure in the liquid storage cavity is lower than the pressure in the gas-liquid separation tank, the liquid in the gas-liquid separation tank is discharged to the liquid storage cavity again under the control of the liquid level control valve II and the natural gas pressure in the tank until the liquid level in the gas-liquid separation tank is not high, then the liquid discharge operation is suspended, and the liquid in the liquid storage cavity is completed, and the liquid in the liquid separation tank is discharged to the liquid storage cavity is divided into multiple times to the main pipe; the liquid entering the conveying main pipe is conveyed to the collecting and conveying pipeline of the collecting and conveying station under the action of pumping pressure of the pumping device and through the cooling device, and then the high-pressure low-temperature natural gas entering the conveying main pipe through the one-way valve III is carried and conveyed to the collecting and conveying pipeline of the collecting and conveying station, so that the conveying pressure in the collecting and conveying pipeline of the collecting and conveying station is reduced, the underground liquid accumulation capacity of the natural gas in a well shaft of the oil and gas well is guaranteed, pumping and production increasing conveying control of the low-yield oil and gas well and oil-gas separation and conveying control of the liquid accumulation in the well shaft of the liquid-containing oil and gas well are realized, the gas-liquid mixture formed by the liquid accumulation in the well shaft of the liquid-containing oil and gas well and the natural gas is continuously carried to the oil and gas well, the deposition of the liquid accumulation in the well shaft of the liquid-containing oil and gas well is eliminated, the liquid blocking is avoided in the well, and the pumping and production increasing functions of the low-yield oil and gas well when the conveying pressure of a gas collecting tree of the oil and gas well is lower than the pressure of the collecting and conveying pipeline of the collecting and conveying station are realized.
The liquid discharging method and the liquid discharging device for the liquid-containing natural gas oil-gas well provided by the invention have the following characteristics:
1) Carrying out oil-gas separation, drainage and control on accumulated liquid in a liquid-containing oil-gas well shaft on the well; 2) Pumping, pressing, increasing production and conveying control is carried out on the low-yield oil and gas well; 3) The multi-dropsy in the liquid-containing oil-gas well shaft is automatically discharged and conveyed for multiple times in batches after being separated on the well, so that the conveying pressure of a gathering and conveying pipeline of a gas gathering station is reduced, and the capability of carrying the underground dropsy by natural gas in the oil-gas well shaft is ensured; 4) Cooling the high-temperature and high-pressure natural gas after the pressure pumping device into high-pressure and low-temperature natural gas for conveying; 5) The natural gas engine is not influenced by pressure change of the oil gas wellhead, and continuous pumping and yield increasing work of the pumping device is ensured; 6) Pure natural gas enters the pumping device, so that the safe operation of the pumping device is ensured; 7) The liquid is discharged to the liquid conveying vehicle by utilizing the pressure of natural gas, so that the liquid is convenient to collect manually; in addition, the invention can be popularized and applied to natural gas recovery of natural gas-containing oil wells.
Drawings
FIG. 1 is a flow chart of the system of the present invention.
In the figure: 1. liquid accumulation; 2. natural gas; 3. a wellhead gas production tree; 4. a gas collecting main pipe; 5. a gas-liquid separation tank, 5Y and liquid; 5a, an oil gas inlet; 5b, an oil gas outlet; 5c, an oil gas bypass port; 5d, a sewage outlet; 5h, and a liquid outlet I; 5f, an emptying port I; 6. a pressure reducing valve; 7. a one-way valve IV; 8. the gas-liquid isolation tank (comprising an oil gas cavity 8W, a liquid storage cavity 8U, a pure air cavity 8G, liquid 8Y, an air inlet I8 a, an air outlet I8 b, a liquid inlet 8c, a high-pressure air inlet 8d, a liquid outlet II 8h, a low-pressure air inlet 8i, an emptying port II 8f, a mounting port I8 m and a mounting port II 8 n); 9. a low pressure gas pipe; 10. the pumping device comprises a pumping hole 10a and a gas outlet II 10 b; 11. a high pressure gas pipe; 12. the cooler (comprising an air inlet II 12a and an air outlet III 12 b); 13. a one-way valve III; 14. a delivery manifold; 15. a pressure regulating valve; 16. the high-pressure gas tank (comprising a gas inlet III 16a, a control gas port 16b, a gas outlet IV 16c and a charging and discharging port 16 d); 17. a pressure regulating and stabilizing valve; 18. the natural gas engine (comprising a gas cut-off valve); 19. controlling the air pipe; 20. a liquid level control valve; 21. pneumatically controlling a three-way valve; 22. a liquid level control valve; 23. a pneumatically controlled shut-off valve; 24. a one-way valve I; 25. a one-way valve V; 26. a one-way valve II; 27. a manual stop valve I; 28. a gas transmission pipeline; 29. a manual stop valve II; 30. a manual shut-off valve III; 31. a high pressure drain valve; 32. a low pressure drain valve; 33. a gas collecting station collecting and conveying pipeline 34 and a pipeline I; 35. a pipeline II; 36. pipeline III.
Detailed Description
The invention uses a production parameter application example of a liquid-containing low-yield oil-gas well to describe the content of the invention in detail;
Figure SMS_1
the invention breaks the connecting pipeline between the wellhead gas production tree 3 and the gas gathering and transporting pipeline 33 of the gas gathering station at the production site of the oil and gas wellhead, installs the liquid-containing low-yield oil and gas well liquid discharging and yield increasing device, connects the gas production main 4 of the device with the wellhead gas production tree 3, and connects the transporting main 14 with the gas gathering and transporting pipeline 33 of the gas gathering station; the gas collecting main pipe 4 is an inlet of the liquid discharging device, and the conveying main pipe 14 is an outlet of the device; after the gas production main pipe 4 is connected with the wellhead gas production tree 3, the conveying main pipe 14 is connected with the gas collecting and conveying pipeline 33 of the gas collecting and conveying station, the device performs oil-gas separation and conveying control on accumulated liquid in a shaft of the liquid-containing oil-gas well on the well, performs pumping, yield increasing and conveying control on the low-yield oil-gas well, and completes liquid drainage of the liquid-containing low-yield oil-gas well and yield increasing of the low-yield oil-gas well in the discharging process from the wellhead gas production tree 3 of the liquid-containing oil-gas well to the gas collecting and conveying pipeline 33 of the gas collecting and conveying station; in this embodiment, wellhead production tree 3 is an existing device on the wellhead of an oil and gas well, a device known in the art for regulating gas well pressure and production; the gathering and transporting pipeline 33 of the gathering station is an existing pipeline on the wellhead of the oil and gas well, and is a gas-liquid transporting pipeline which is well known in the art and is used for connecting the gas production tree 3 and the gathering station; the gas production main pipe 4 is an inlet of the liquid discharging device system, and the conveying main pipe 14 is an outlet of the liquid discharging device system;
In the application of the invention to the liquid-containing natural gas well, as shown in figure 1, a liquid discharging device of the liquid-containing low-yield gas well is arranged on a connecting pipeline between a wellhead gas production tree 3 and a gas gathering and transportation pipeline 33 of a gas gathering station; the liquid draining device is provided with a gas-liquid separation tank 5; the gas-liquid separation tank 5 is internally provided with liquid 5Y, and the inner cavity of the gas-liquid separation tank is divided into a gas oil cavity and a liquid cavity by the liquid level of the liquid 5Y; an oil gas inlet 5a of the oil gas cavity of the gas-liquid separation tank is communicated with an oil gas collecting main pipe 4; the gas production main pipe 4 is communicated with the wellhead gas production tree 3 to serve as an inlet of a liquid discharging device; a liquid outlet I5 h of the liquid cavity of the gas-liquid separation tank is communicated with the liquid storage cavity 8y of the gas-liquid separation tank, and a pneumatic control stop valve 23 and a one-way valve I24 are arranged between the liquid outlet I5 h and the liquid storage cavity 8 y; the gas-liquid separation tank is also provided with a gas-oil bypass port 5c corresponding to the gas-oil cavity; the oil gas bypass port 5c is connected to a conveying main pipe through a one-way valve II 26, a manual stop valve 27 and a gas conveying pipeline 14; the gas transmission pipeline 14 is an outlet of the liquid discharging device; the top of the gas-liquid separation tank is provided with an emptying port I5 f, and the bottom of the gas-liquid separation tank is provided with a sewage outlet 5d; the oil gas outlet 5b of the gas-liquid separation tank is connected with the oil gas cavity 8W of the gas-liquid separation tank 8;
The inside of the gas-liquid isolation tank 8 is sequentially divided into a pure air cavity 8G, an oil-gas cavity 8W and a liquid storage cavity 8U from top to bottom; the pure air cavity 8G and the oil-gas cavity 8W are isolated by adopting a mist catcher, and the oil-gas cavity 8W and the liquid storage cavity 8U are two cavities isolated in a sealing way;
the circumference of the pure air cavity 8G is provided with an air outlet I8 b and an air exhaust port II 8f; the air outlet I8 b is communicated with an air extraction opening 10a of the air extracting and pressing device 10, the air outlet II 10b of the air extracting and pressing device is connected to an air inlet II 12a of the cooler 12 through a high-pressure air pipe, and an air outlet III 12b of the cooler is connected to the conveying main pipe 14; a one-way valve III is arranged between the air outlet III 12b of the cooler and the conveying main pipe 14; an air inlet I8 a, a low-pressure air inlet 8i and a mounting opening I8 m are arranged on the circumference of the oil gas cavity 8W, and the air inlet I is communicated with an oil gas outlet of the gas-liquid separation tank; the low-pressure air port 8i is connected to an outlet B of the pneumatic control three-way valve 21; the circumference of the liquid storage cavity 8U is provided with a liquid inlet 8c, a high-pressure air inlet 8d, a liquid outlet II 8h and a mounting opening II 8n; the liquid inlet 8c is connected to the liquid outlet I5 h of the gas-liquid separation tank through a one-way valve I1 and a pneumatic control stop valve 23, the high-pressure air inlet 8d is connected to the air inlet A of the pneumatic control three-way valve 21, and the liquid outlet II 8h is communicated with the conveying main pipe 14; the mounting port I8 m of the oil air cavity is communicated with the mounting port II 8n of the liquid storage cavity through a one-way valve IV;
The liquid discharge device is also provided with a high-pressure gas tank 16; the circumference of the high-pressure gas tank 16 is provided with a gas inlet III 16a, a control gas inlet 16b, a gas outlet IV 16c and a charging and discharging port; the air inlet III 16a is connected to the air outlet III 12b of the cooler 12, and the control air inlet 16b is divided into three pipelines through a control air pipe 19: the pipeline I34 is connected to a liquid level control valve I20 arranged on the liquid storage cavity of the gas-liquid separation tank, the liquid level control valve I20 is connected to a pneumatic control port K of the pneumatic control three-way valve 21, the pipeline II 35 is connected to a reversing port C of the pneumatic control three-way valve 21, the pipeline III 36 is connected to a liquid level control valve II 22 arranged on the gas-liquid separation tank 5, and the liquid level control valve II 22 is connected to a pneumatic control port S of the pneumatic control stop valve 23; the gas outlet IV 16c is connected to a gas shutoff valve 17 on the natural gas engine; the charging and discharging port is connected with a gas transmission pipeline; an inlet A of the pneumatic control three-way valve 21 is communicated with a high-pressure air port 8d of the gas-liquid isolation tank; the liquid level control valve I21 is communicated when the liquid level of the liquid in the liquid storage cavity of the gas-liquid isolation tank is high, high-pressure gas from a control gas port of the high-pressure gas tank acts on the pneumatic control port K of the pneumatic control three-way valve through the pipeline I34 of the control gas pipe and the liquid level control valve I21, so that the inlet A and the reversing port C of the pneumatic control three-way valve are communicated, the liquid level control valve I21 is blocked when the liquid level of the liquid storage cavity of the gas-liquid isolation tank is low, and the pneumatic control three-way valve pneumatic control port K loses high-pressure gas to enable the inlet A and the outlet B to be communicated; the liquid level control valve II 22 is cut off when the liquid level in the gas-liquid separation tank is low;
The pneumatic control stop valve 23 is provided with an inlet A, an outlet B and a pneumatic control port S; the inlet A is connected to a liquid outlet 5h of the gas-liquid separation tank through a pipeline, and the outlet B is communicated with a liquid inlet 8c of the gas-liquid separation tank through a one-way valve I; the pipeline III 36 of the pneumatic control port S liquid discharging device control port is communicated; the pneumatic control port S of the pneumatic control stop valve loses high-pressure acting gas to stop the inlet A and the outlet B;
in order to realize the control of carrying out oil-gas separation and discharge on 2355dm3 of accumulated liquid in a liquid-containing oil-gas well shaft on the well, the gas-liquid separation tank 5 is used for collecting and separating 2355dm3 of multi-accumulated liquid 1 carried to the well by 3.0MPa of natural gas 2 in the oil-gas well shaft, the separated 3.0MPa of natural gas is conveyed to the conveying main pipe 14 through the gas-liquid separation tank 5, the 2355dm3 of multi-accumulated liquid 1 carried to the oil-gas well shaft is batched and discharged to the gas-liquid separation tank 8 through the gas-liquid separation tank 5, is divided into 10 times by the gas-liquid separation tank 8 and is discharged to the conveying main pipe 14, and is carried along with the natural gas entering the conveying main pipe 14 and discharged to the collecting and conveying pipeline 33 of a gas collecting station; after the gas production main pipe 4 is connected with the wellhead gas production tree 3, an oil gas inlet 5a of the gas-liquid separation tank 5 is communicated with a shaft of the liquid-containing oil gas well through the gas production main pipe 4 and the wellhead gas production tree 3; when the conveying pressure of the gas production tree 3 at the oil gas wellhead is higher than the pressure of the collecting and conveying pipeline 33 at the gas collecting and conveying station, a manual stop valve I27 is opened, and a gas-liquid mixture formed by 2355dm3 of accumulated liquid 1 and 3.0MPa of natural gas 2 in a shaft of a liquid-containing oil gas well enters a tank through the gas production tree 3, a gas production main pipe 4 and an oil gas inlet 5a of a gas-liquid separation tank 5; 2355dm3 of liquid 5Y separated by the gas-liquid separation tank 5 is stored at the bottom of 3500dm3, the high-pressure natural gas of the oil-gas well 3.0MPa separated by the gas-liquid separation tank 5 is conveyed to the gas collecting and conveying pipeline 33 by the conveying main pipe 14 after entering the one-way valve III 13 through the oil-gas bypass port 5c, the one-way valve II 26, the manual stop valve I27 and the gas conveying pipeline 28 of the gas-liquid separation tank 5, and the natural gas production work is finished when the conveying pressure of the wellhead gas production tree 3 of the liquid-containing oil-gas well is higher than the pressure of the gas collecting and conveying pipeline 33 by 1.5 MPa; a check valve III 13 arranged between the air outlet 12b of the cooler 12 and the conveying main 14 for ensuring that the air or liquid in the conveying main 14 cannot flow back into the air outlet 12b of the cooler 12; in the process that the high-pressure natural gas of the oil-gas well is conveyed to the conveying main pipe 14 from the oil-gas bypass port 5c of the gas-liquid separation tank 5, the manual stop valve 29 is opened, the 3.0MPa high-pressure natural gas enters the high-pressure gas tank 16 from the charging and discharging port 16d of the high-pressure gas tank 16 through the oil-gas bypass port 5c of the gas-liquid separation tank 5, the one-way valve 26, the manual stop valve I27, the gas transmission pipeline 28 and the manual stop valve II 29, and is separated into 3 pipelines through the control gas pipe 19 from the control gas port 16b of the high-pressure gas tank 16 to convey 3.0MPa high-pressure gas outwards: the liquid is conveyed to a liquid level control valve 20 arranged on a liquid storage cavity 8U of the gas-liquid separation tank 8 through a pipeline I34, is conveyed to a reversing port C of the pneumatic control three-way valve 21 through a pipeline II 35, and is conveyed to a liquid level control valve 22 arranged on the gas-liquid separation tank 5 through a pipeline III 36; when the liquid level of the liquid 5Y at the bottom of the gas-liquid separation tank 5 is higher than 0.5m, a liquid level control valve II 22 arranged on the gas-liquid separation tank 5 is communicated, 3.0MPa high-pressure gas from a control gas port 16B of the high-pressure gas tank 16 acts on a pneumatic control port S of a pneumatic control stop valve 23 through a pipeline 3 of a control gas pipe 19 and the liquid level control valve II 22, so that an inlet A and an outlet B of the pneumatic control stop valve 23 are communicated, and the liquid 5Y of the gas-liquid separation tank 5 is discharged from a liquid inlet 8c of the gas-liquid separation tank 8 to a liquid storage cavity 8U of the gas-liquid separation tank 8 through a liquid outlet 5h of the gas-liquid separation tank 5, an inlet A and an outlet B of the pneumatic control stop valve 23 and a one-way valve 24 under the action of natural gas pressure of 3.0MPa in the tank, and the liquid storage volume of the liquid storage cavity 8U is 230 dm3; when the liquid level of the liquid 8Y in the liquid storage cavity 8U of the gas-liquid isolation tank 8 is higher than 0.5m, a liquid level control valve 20 arranged on the liquid storage cavity 8U of the gas-liquid isolation tank 8 is conducted, 3.0MPa high-pressure gas from a control gas port 16b of the high-pressure gas tank 16 acts on a pneumatic control port K of the pneumatic control three-way valve 21 through a pipeline I of a control gas pipe 19 and the liquid level control valve I20, so that an inlet A and a reversing port C of the pneumatic control three-way valve 21 are conducted, 3.0MPa high-pressure gas from the control gas port 16b of the high-pressure gas tank 16 enters the liquid storage cavity 8U of the gas-liquid isolation tank 8 through a control gas pipe 19 pipeline 2, the reversing port C and the inlet A of the pneumatic control three-way valve 21, and 230 dm3 liquid 8Y in the liquid storage cavity 8U of the gas-liquid isolation tank 8U is discharged to a conveying main pipe 14 after the one-way valve 13 through a pipeline and a one-way valve 25 under the action of 3.0MPa high-pressure gas in the pipeline 2 of the control gas pipe 19; the one-way valve IV 7 is arranged between the 8m interface of the oil gas cavity 8W and the 8n interface of the liquid storage cavity 8U and is used for ensuring that high-pressure gas in the liquid storage cavity 8U of the gas-liquid separation tank 8 cannot flow back into the oil gas cavity 8W of the gas-liquid separation tank 8; the one-way valve 24 is used for ensuring that the liquid 8Y in the liquid storage cavity 8U of the gas-liquid separation tank 8 cannot flow back into the gas-liquid separation tank 5 when being discharged to the conveying main pipe 14 during the conduction period of the inlet A and the outlet B of the pneumatic control stop valve 23; the one-way valve 25 is arranged behind the liquid outlet 8h of the liquid storage cavity 8U of the gas-liquid separation tank 8 and is used for ensuring that natural gas and liquid in the conveying main pipe 14 cannot flow back into the liquid storage cavity 8U of the gas-liquid separation tank 8; when the liquid level of the liquid 5Y stored in the bottom of the gas-liquid separation tank 5 is low, a liquid level control valve 22 arranged on the gas-liquid separation tank 5 is closed, 3.0MPa gas in a pipeline 3 of a control gas pipe 19 from a control gas port 16B of the high-pressure gas tank 16 cannot enter a pneumatic control port S of a pneumatic control stop valve 23 through the liquid level control valve 22, so that an inlet A and an outlet B of the pneumatic control stop valve 23 are closed, a liquid outlet 5h of the gas-liquid separation tank 5 is not communicated with a liquid inlet 8c of a liquid storage cavity 8U of the gas-liquid separation tank 8, and the fact that 3.0MPa natural gas in the gas-liquid separation tank 5 cannot enter the liquid storage cavity 8U of the gas-liquid separation tank 8 is ensured; when 230 dm3 of liquid 8Y in the liquid storage cavity 8U of the gas-liquid separation tank 8 is discharged to the conveying main pipe 14, the liquid level of the liquid 8Y in the liquid storage cavity 8U of the gas-liquid separation tank 8 is reduced, so that a liquid level control valve 20 arranged on the liquid storage cavity of the gas-liquid separation tank 8 is cut off, 3.0MPa gas in a control gas pipe 19 pipeline I from a control gas port 16B of the high-pressure gas tank 16 cannot enter a pneumatic control three-way valve 21 pneumatic control port K through the liquid level control valve I20, so that an inlet A and a reversing port C of the pneumatic control three-way valve 21 are cut off, the reversing is conducted to the inlet A and the outlet B of the pneumatic control three-way valve 21, 3.0MPa high-pressure gas in a control gas pipe 19 pipeline II does not enter the liquid storage cavity 8U of the gas-liquid separation tank 8 through the inlet A and the reversing port C of the pneumatic control three-way valve 21, 3.0MPa high-pressure gas stored in the liquid storage cavity 8U of the gas-liquid separation tank 8 is discharged to the low-pressure air inlet 8i of the oil air cavity 8W of the gas-liquid separation tank 8 through the high-pressure air inlet 8d and the inlets A and the outlets B of the pneumatic control three-way valve 21, so that the pressure in the liquid storage cavity 8U of the gas-liquid separation tank 8 is reduced, when the pressure in the liquid storage cavity 8U is lower than the pressure of 3.0MPa in the gas-liquid separation tank 5, the liquid 5Y of the gas-liquid separation tank 5 is discharged to the liquid storage cavity 8U of the gas-liquid separation tank 8 under the control of the liquid level control valve 22 and the natural gas pressure of 3.0MPa in the tank, the liquid is stopped from flowing back until the liquid level of the liquid 5Y of the gas-liquid separation tank 5 and the liquid storage cavity 8U of the gas-liquid separation tank 8 is not high, and the liquid discharge of 2355dm3 of the liquid 5Y in the gas-liquid separation tank 8U is completed in batches to the liquid storage cavity 8U of the gas-liquid separation tank 8, and 230 dm3 of the liquid 8Y in the liquid storage cavity 8U is discharged to the conveying main pipe 14 for 10 times; the liquid 8Y entering the conveying main pipe 14 is carried by the natural gas entering the conveying main pipe 14 from the oil gas bypass port 5c of the gas-liquid separation tank 5 and is discharged to the gas collecting and conveying pipeline 33 of the gas collecting and conveying station, so that the conveying pressure in the gas collecting and conveying pipeline 33 of the gas collecting and conveying station is reduced, the capability of carrying the underground effusion by the natural gas in the oil gas well shaft is ensured, and the purpose of controlling the oil-gas separation and discharge of the effusion in the liquid-containing oil gas well shaft on the shaft is achieved; a manual stop valve III 30 connected with a drain outlet 5d of the gas-liquid separation tank 5 is manually opened, and the liquid 5Y of the gas-liquid separation tank 5 is discharged to a liquid transporting vehicle under the action of the pressure of natural gas in the tank so as to be convenient for manual collection of the liquid 5Y of the gas-liquid separation tank 5; the high-pressure evacuation valve 31 connected with the evacuation port 5f of the gas-liquid separation tank 5 is used for protecting the safety of the gas-liquid separation tank 5; the low-pressure emptying valve 32 connected with the emptying port 8f of the pure air cavity 8G of the gas-liquid isolation tank 8 is used for protecting the safety of the gas-liquid isolation tank 8; a pressure reducing and stabilizing valve 17 is arranged between the natural gas engine and the high-pressure gas tank and is used for ensuring the stability of fuel required by the operation of the natural gas engine;
When the conveying pressure of the oil gas wellhead gas production tree 3 is 1.0MPa lower than the pressure of the gas collecting and conveying pipeline 33 of the gas collecting and conveying station by 1.5MPa, the natural gas of the oil gas wellhead gas production tree 3 cannot enter the conveying main pipe 14 to be conveyed to the gas collecting and conveying station by the gas-liquid separating tank 5, at the moment, the natural gas yield of the oil gas well is 0, and the one-way valve 26 arranged at the liquid outlet 5h of the gas-liquid separating tank 5 is used for ensuring that the natural gas and the liquid of 1.5MPa in the conveying main pipe 14 cannot flow backwards into the liquid separating tank 5; in order to realize pumping and yield increasing conveying control of the low-yield oil and gas well, a manual stop valve 29 is opened at the moment, 1.5MPa natural gas in a conveying main pipe 14 is inflated from an inflation opening 16d of a high-pressure gas tank 16 to the high-pressure gas tank 16 through a gas conveying pipeline 28 and the manual stop valve 29, and the 1.5MPa natural gas entering the high-pressure gas tank 16 is used for providing starting fuel for a natural gas engine 18; the manual stop valve 29 is closed after the high-pressure gas tank 16 is filled, the natural gas engine 18 is started to operate the pumping device 10, under the continuous pumping action of the pumping device 10, pure natural gas of the pure gas cavity 8G of the gas-liquid separation tank 8 enters the pumping device 10 from the gas outlet 10b to be discharged from the high-pressure natural gas higher than 1.5MPa through the gas outlet 8b and the low-pressure gas pipe 9, so that the natural gas in the pure gas cavity 8G of the gas-liquid separation tank 8 is immediately reduced, the natural gas in the gas cavity 8W is immediately supplemented to the pure gas cavity 8G, the natural gas in the gas cavity 8W is reduced, after the natural gas in the gas-liquid separation tank 5 is supplemented to the gas cavity 8W through the gas-gas outlet 5b, the pressure reducing valve 6 and the gas inlet 8a of the gas-liquid separation tank 8, the natural gas pressure entering the gas cavity 8W through the pressure reducing valve 6 is 0.1MPa, the gas mixture formed by the gas-liquid 1 and 1.0MPa gas in the gas-liquid separation tank 5 is carried to the gas well, the gas-liquid mixture formed by the gas-liquid 1 and 1.0MPa gas in the gas-liquid separation tank 5 is carried to the gas well, the gas cavity is reduced through the gas-liquid inlet 4, the gas-gas cavity 8W is supplemented to the gas cavity 8W through the pressure reducing valve 6, the gas-gas pressure inlet 8W is supplemented to the gas cavity 8W, the natural gas pressure entering the gas cavity 8W through the pressure reducing valve 6, the gas pressure 1MPa in the gas-gas cavity 1MPa, the gas mixture is reduced from the gas cavity 1MPa, the gas-gas cavity 1 and the gas cavity 1; the oil gas cavity 8W and the liquid storage cavity 8U of the gas-liquid separation tank 8 are two cavities which are mutually separated up and down, the oil gas cavity 8W is arranged at the upper part of the liquid storage cavity 8U, liquid enters the liquid storage cavity 8U of the gas-liquid separation tank 8 through a one-way valve 7 arranged between an 8m interface of the oil gas cavity 8W and an 8n interface of the liquid storage cavity 8U for storage, mist liquid carried in 0.1MPa natural gas is separated by mist-capturing materials and falls into the bottom of the oil gas cavity 8W, pure 0.1MPa low-pressure natural gas enters the pure gas cavity 8G of the gas-liquid separation tank 8 and enters an extraction opening 10a of the extraction device 10 through an air outlet 8b and a low-pressure air pipe 9, the safe operation of the extraction device 10 is ensured, under the extraction effect of the extraction device 10, the high-temperature high-pressure natural gas with the pressure of 100 ℃ which is higher than the pressure of a gas collecting and conveying pipeline 33 of a gas collecting station enters an air inlet 12a of the cooler 12 through a high-pressure air pipe 11, is cooled to 30 ℃ through the cooler 12, and then the pure high-pressure natural gas enters the collecting and conveying pipeline 13 through the air outlet 12b of the cooling device 12 to the collecting station collecting and the collecting pipeline 14 under the action of the extraction pressure of the extraction device 10; a small amount of natural gas with high pressure and low temperature at 30 ℃ cooled by the cooler 12 is stabilized by the pressure stabilizing valve 15, then continuously enters the high pressure gas tank 16 through the gas inlet 16a of the high pressure gas tank 16, and becomes fuel required by the continuous operation of the natural gas engine 18 after passing through the pipeline and the pressure reducing and stabilizing valve 17 through the gas outlet 16c of the high pressure gas tank 16, so that the natural gas engine 18 is not influenced by the pressure change of 1.0MPa of the wellhead of the gas production tree 3 at the oil gas wellhead, and the continuous pumping natural gas yield increasing work of the pumping device 10 is ensured; the natural gas entering the high pressure gas tank 16 is also divided into 3 lines from a control gas port 16b of the high pressure gas tank 16 through a control gas pipe 19 to deliver the high pressure gas higher than 1.5MPa to the outside: the liquid is conveyed to a liquid level control valve 20 arranged on a liquid storage cavity 8U of the gas-liquid separation tank 8 through a pipeline 1, is conveyed to a reversing port C of a pneumatic control three-way valve 21 through a pipeline 2, and is conveyed to a liquid level control valve 22 arranged on the gas-liquid separation tank 5 through a pipeline 3; when the liquid level of the liquid 5Y stored in the bottom of the gas-liquid separation tank 5 is high, a liquid level control valve 22 arranged on the gas-liquid separation tank 5 is conducted, high-pressure gas higher than 1.5MPa from a control gas port 16B of the high-pressure gas tank 16 acts on a pneumatic control port S of a pneumatic control stop valve 23 through a control gas pipe 19 pipeline 3 and a liquid level control valve 22, so that an inlet A and an outlet B of the pneumatic control stop valve 23 are conducted, the liquid 5Y of the gas-liquid separation tank 5 is under the action of 1.0MPa natural gas pressure in the tank, the liquid is discharged from a liquid outlet 5h of the gas-liquid separation tank 5, an inlet A and an outlet B of the pneumatic control stop valve 23 and a one-way valve 24 from a liquid inlet 8C of the gas-liquid separation tank 8 to a liquid storage cavity 8U, when the liquid level of the liquid 8U of the liquid storage cavity 8U of the gas-liquid separation tank 8 is higher than 0.5m, the liquid level control valve 20 arranged on the liquid storage cavity 8U of the gas-liquid separation tank 8B is conducted, the high-pressure gas higher than 1.5MPa from the control gas port 16B of the high-pressure gas tank 16 acts on the high-pressure gas through a control gas pipe 19 pipeline 1, the liquid level control valve 21K acts on the pneumatic control valve 21 and the liquid inlet 8B of the three-way valve 8B, the liquid storage tank 2 is conducted from the liquid inlet 8C of the high-pressure control valve 21 to the gas tank 8C through the pneumatic control gas pipe 21 and the three-way valve 1.1, and the liquid inlet 8C 2 is discharged from the liquid inlet 8C of the liquid inlet 8C, and the liquid inlet 1; the one-way valve IV 7 is arranged between the 8m interface of the oil gas cavity 8W and the 8n interface of the liquid storage cavity 8U and is used for ensuring that high-pressure gas higher than 1.5MPa in the liquid storage cavity 8U of the gas-liquid separation tank 8 cannot flow back into the oil gas cavity 8W of the gas-liquid separation tank 8; the one-way valve 24 is used for ensuring that the liquid 8Y in the liquid storage cavity 8U of the gas-liquid separation tank 8 cannot flow back into the gas-liquid separation tank 5 when being discharged to the conveying main pipe 14 during the conduction period of the inlet A and the outlet B of the pneumatic control stop valve 23; the one-way valve 25 is arranged behind the liquid outlet 8h of the liquid storage cavity 8U of the gas-liquid separation tank 8 and is used for ensuring that the natural gas and the liquid with the pressure of 1.0MPa in the conveying main pipe 14 cannot flow backwards into the liquid storage cavity 8U of the gas-liquid separation tank 8; when the liquid level of the liquid 5Y at the bottom of the gas-liquid separation tank 5 is lower than 0.5m, a liquid level control valve 22 arranged on the gas-liquid separation tank 5 is cut off, gas higher than 1.5MPa in a pipeline 3 of a control gas pipe 19 from a control gas port 16B of a high-pressure gas tank 16 cannot enter a pneumatic control port S of a pneumatic control stop valve 23 through the liquid level control valve 22, so that an inlet A and an outlet B of the pneumatic control stop valve 23 are cut off, a liquid outlet 5h of the gas-liquid separation tank 5 is not communicated with a liquid inlet 8c of a liquid storage cavity 8U of the gas-liquid separation tank 8, and the fact that the natural gas with the pressure of 1.0MPa in the gas-liquid separation tank 5 cannot enter the liquid storage cavity 8U of the gas-liquid separation tank 8 is ensured; when the liquid 8Y in the liquid storage cavity 8U of the gas-liquid separation tank 8 is discharged to the conveying main pipe 14, the liquid level of the liquid 8Y in the liquid storage cavity 8U of the gas-liquid separation tank 8 is reduced, so that a liquid level control valve 20 arranged on the liquid storage cavity of the gas-liquid separation tank 8 is cut off, gas with the pressure higher than 1.5MPa in a pipeline 1 of a control gas port 16B of a high-pressure gas tank 16 cannot enter a pneumatic control port K of a pneumatic control three-way valve 21 through a liquid level control valve 20, an inlet A and a reversing port C of the pneumatic control three-way valve 21 are cut off, the reversing is conducted to the inlet A and the outlet B of the pneumatic control three-way valve 21, the high-pressure gas with the pressure higher than 1.5MPa in the pipeline 2 of the control gas pipe 19 does not enter the liquid storage cavity 8U of the gas-liquid separation tank 8 through the inlet A and the reversing port C of the pneumatic control three-way valve 21, the high-pressure gas which is stored in the liquid storage cavity 8U of the gas-liquid separation tank 8 and is higher than 1.5MPa is discharged to the low-pressure gas port 8i of the oil gas cavity 8W of the gas-liquid separation tank 8 with the pressure of 0.1MPa through the high-pressure gas port 8d and the inlet A and the outlet B of the pneumatic control three-way valve 21, so that the pressure of the liquid storage cavity 8U of the gas-liquid separation tank 8 is reduced, after the pressure of the liquid storage cavity 8U is lower than the pressure of 1.0MPa in the gas-liquid separation tank 5, the liquid 5Y of the gas-liquid separation tank 5 is discharged to the liquid storage cavity 8U of the gas-liquid separation tank 8 again under the control of the liquid level control valve 22 and the action of the natural gas pressure of 1.0MPa in the tank, the liquid 5Y of the gas-liquid separation tank 8 is stopped from flowing back until the liquid 5Y of the gas-liquid separation tank 8U is not high, and the liquid 8Y of the gas-liquid separation tank 8U is discharged in batches, and the liquid 8Y of the liquid 8U is discharged to the conveying main 14 for multiple times; the liquid 8Y entering the conveying header 14 is cooled by the cooler 12 under the pumping action of the pumping device 10 and then enters the conveying header 14 through the one-way valve 13 to be conveyed to the gas collecting and conveying pipeline 33 of the gas collecting and conveying station under the carrying of high-pressure low-temperature natural gas higher than 1.5MPa, so that the conveying pressure in the gas collecting and conveying pipeline 33 of the gas collecting and conveying station is reduced, the capability of carrying underground liquid accumulation of natural gas in a well shaft of the gas-oil well is ensured, pumping and yield increasing conveying control on the low-yield gas-oil well and oil-gas separating and conveying control on the liquid in the well shaft of the liquid-oil-containing gas well are realized, the gas-liquid mixture formed by the liquid 1 and the natural gas 2 in the well shaft of the liquid-oil well is continuously carried on the gas well, the deposition of the liquid in the liquid-oil-gas well is eliminated, the liquid blocking is avoided under the well of the liquid, and the pumping and yield increasing functions of the low-yield of the gas well 0 are realized when the conveying pressure of the gas well head gas collecting and conveying tree 3 is lower than the pressure of the gas collecting and conveying pipeline 33 of the gas station are realized; a manual stop valve 30 connected with a drain outlet 5d of the gas-liquid separation tank 5 is manually opened, and the liquid 5Y of the gas-liquid separation tank 5 is discharged to a liquid transporting vehicle under the action of the pressure of natural gas in the tank so as to facilitate manual collection of the liquid in the gas-liquid separation tank 5; the high-pressure evacuation valve 31 connected with the evacuation port 5f of the gas-liquid separation tank 5 is used for protecting the safety of the gas-liquid separation tank 5; the low-pressure emptying valve 32 connected with the emptying port 8f of the pure air cavity 8G of the gas-liquid isolation tank 8 is used for protecting the safety of the gas-liquid isolation tank 8; a pressure reducing and stabilizing valve 17 is arranged between the natural gas engine and the high-pressure gas tank and is used for ensuring the stability of fuel required by the operation of the natural gas engine;
In the invention, the pneumatic control stop valve 23 adopts an electric control stop valve, and when the pneumatic control three-way valve 21 adopts an electric control three-way valve, the aim of the invention can be achieved through the change of a connecting pipeline.
The driving power of the pumping device 10 is preferably natural gas engine 18, the pumping device 10 is not limited to being driven by the natural gas engine 18, and the natural gas engine 18 is provided with a gas cut-off valve; the cooler 12 is a natural gas temperature reducing device.

Claims (6)

1. The utility model provides a contain flowing back device of liquid low yield oil gas well which characterized in that: the liquid discharging device is arranged on a connecting pipeline between the wellhead gas production tree and the gas gathering and transportation pipeline of the gas gathering station; the liquid discharging device is provided with a gas-liquid separation tank; the gas-liquid separation tank is internally provided with liquid, and the inner cavity of the gas-liquid separation tank is divided into a gas oil cavity and a liquid cavity by the liquid level of the liquid; an oil-gas inlet of the oil cavity of the gas-liquid separation tank is communicated with an oil-gas collecting main pipe; the gas production main pipe is communicated with the wellhead gas production tree; a liquid outlet I of the liquid cavity of the gas-liquid separation tank is communicated with a liquid storage cavity of the gas-liquid separation tank, and a pneumatic control stop valve and a one-way valve I are arranged between the liquid outlet I and the liquid storage cavity; the gas-liquid separation tank is also provided with an oil-gas bypass port corresponding to the gas-oil cavity; the oil gas bypass port is communicated with the conveying main pipe; the oil gas outlet of the gas-liquid separation tank is connected with the oil gas cavity of the gas-liquid separation tank;
The inside of the gas-liquid isolation tank is sequentially divided into a pure air cavity, an oil air cavity and a liquid storage cavity from top to bottom; the pure air cavity and the oil-gas cavity are isolated by adopting a mist catcher, and the oil-gas cavity and the liquid storage cavity are two cavities which are isolated in a sealing way;
the circumference of the pure air cavity is provided with an air outlet I and an air exhaust port II; the air outlet I is communicated with an air extraction opening of the air extracting and pressing device, the air outlet II of the air extracting and pressing device is connected to the air inlet II of the cooler through a high-pressure air pipe, and the air outlet III of the cooler is connected to the conveying main pipe; the circumference of the oil gas cavity is provided with an air inlet I, a low-pressure air port and a mounting port I, and the air inlet I is communicated with an oil gas outlet of the gas-liquid separation tank; the low-pressure air port is connected to an outlet B of the pneumatic control three-way valve; the circumference of the liquid storage cavity is provided with a liquid inlet, a high-pressure air port, a liquid outlet II and a mounting port II; the liquid inlet is connected to a liquid outlet I of the gas-liquid separation tank through a pipeline, a one-way valve and a pneumatic control stop valve, the high-pressure air inlet is connected to an air inlet A of the pneumatic control three-way valve, and the liquid outlet II is communicated with the conveying main pipe; the mounting port I of the oil air cavity is communicated with the mounting port II of the liquid storage cavity;
the liquid discharge device is also provided with a high-pressure air tank; the circumference of the high-pressure gas tank is provided with a gas inlet III, a control gas inlet, a gas outlet IV and a charging and discharging port; the air inlet III is connected to the air outlet III of the cooler, and the control air inlet is divided into three pipelines through a control air pipe: the pipeline I is connected to a liquid level control valve I arranged on the liquid storage cavity of the gas-liquid separation tank, the liquid level control valve I is connected to a pneumatic control port K of the pneumatic control three-way valve, the pipeline II is connected to a reversing port C of the pneumatic control three-way valve, the pipeline III is connected to a liquid level control valve II arranged on the gas-liquid separation tank, and the liquid level control valve II is connected to a pneumatic control port S of the pneumatic control stop valve; the gas outlet IV is connected to a gas cut-off valve on the natural gas engine; the charging and discharging port is connected with a gas transmission pipeline; an inlet A of the pneumatic control three-way valve is communicated with a high-pressure air port of the gas-liquid isolation tank; the liquid level control valve I is communicated when the liquid level of the liquid in the liquid storage cavity of the gas-liquid isolation tank is high, high-pressure gas from a control gas port of the high-pressure gas tank acts on the pneumatic control port K of the pneumatic control three-way valve through the pipeline I of the control gas pipe and the liquid level control valve I to enable the inlet A and the reversing port C of the pneumatic control three-way valve to be communicated, the liquid level control valve is blocked when the liquid level of the liquid storage cavity of the gas-liquid isolation tank is low, and the pneumatic control port K of the pneumatic control three-way valve loses high-pressure acting gas to enable the inlet A and the outlet B to be communicated; the liquid level control valve II is cut off when the liquid level in the gas-liquid separation tank is low; liquid in the gas-liquid separation tank is discharged to the liquid storage cavity in batches under the control of the liquid level control valve II and the action of natural gas pressure in the tank, and the liquid in the liquid storage cavity is divided into a plurality of times to be discharged to the conveying main pipe;
The pneumatic control stop valve is provided with an inlet A, an outlet B and a pneumatic control port S; the inlet A is connected to a liquid outlet of the gas-liquid separation tank through a pipeline, and the outlet B is communicated with a liquid inlet of the gas-liquid separation tank through a one-way valve; the pneumatic control port S liquid discharging device is communicated with a pipeline III of the control port; the pneumatic control port S of the pneumatic control stop valve loses high-pressure acting gas to stop the inlet A and the outlet B.
2. The drainage apparatus of claim 1, wherein the drainage apparatus comprises: the oil gas bypass port is connected to the conveying main pipe through a one-way valve II, a manual stop valve I and a gas conveying pipeline.
3. The drainage apparatus of claim 1, wherein the drainage apparatus comprises: the top of gas-liquid separation jar be provided with emptying port I, the bottom is provided with the drain.
4. The drainage apparatus of claim 1, wherein the drainage apparatus comprises: a one-way valve III is arranged between the air outlet of the cooler and the conveying main pipe and used for ensuring that gas or liquid in the conveying main pipe cannot flow back into the air outlet of the cooler.
5. The drainage apparatus of claim 1, wherein the drainage apparatus comprises: and a one-way valve V is arranged behind the liquid outlet of the liquid storage cavity of the gas-liquid isolation tank and is used for ensuring that natural gas and liquid in the conveying main pipe cannot flow backwards into the liquid storage cavity of the gas-liquid isolation tank.
6. A drainage method for draining liquid by using the drainage device of the liquid-containing low-yield oil-gas well according to any one of claims 1 to 5, which is characterized in that: after the gas production main pipe is connected with the wellhead gas production tree, and the conveying main pipe is connected with the gas collecting and conveying pipeline of the gas collecting station, the liquid discharging device performs oil-gas separation and conveying control on accumulated liquid in a shaft of the liquid-containing oil-gas well on the well, performs pumping, yield increasing and conveying control on the low-yield oil-gas well, and completes liquid discharging of the liquid-containing low-yield oil-gas well and yield increasing of the low-yield oil-gas well; the specific method comprises the following steps:
the gas-liquid separation tank is used for collecting and separating multi-liquid-accumulation carried to the well by natural gas in the oil-gas well shaft, the separated natural gas is conveyed to the conveying main pipe through the gas-liquid separation tank, the multi-liquid-accumulation carried to the oil-gas well shaft is batched and discharged to the gas-liquid separation tank through the gas-liquid separation tank, and the multi-liquid-accumulation is divided into a plurality of times and is discharged to the conveying main pipe through the gas-liquid separation tank, and the multi-liquid-accumulation is carried and discharged to the gas collecting and conveying pipeline of the gas collecting station along with the natural gas entering the conveying main pipe; after the gas collecting main pipe is connected with the wellhead gas collecting tree, the oil gas inlet of the gas-liquid separation tank is communicated with the shaft of the liquid-containing oil gas well through the gas collecting main pipe and the wellhead gas collecting tree; when the conveying pressure of the gas production tree of the oil gas wellhead is higher than the pressure of a gathering and conveying pipeline of the gathering and conveying station, a manual stop valve I is opened, and a gas-liquid mixture formed by accumulated liquid and natural gas in a shaft of the liquid-containing oil gas well enters the tank through the gas inlet of the gas production tree, the gas production main pipe and the gas-liquid separation tank; the liquid separated by the gas-liquid separation tank is stored at the bottom of the tank, the high-pressure natural gas of the oil-gas well separated by the gas-liquid separation tank is conveyed to a gas collecting station collecting and conveying pipeline through a conveying main pipe after entering a one-way valve III through the gas-liquid separation tank and a gas conveying pipeline, and the production work of conveying the natural gas when the conveying pressure of a gas collecting tree at the wellhead of the oil-gas well containing the liquid is higher than the pressure of the gas collecting and conveying pipeline of the gas collecting station is completed; in the process that the high-pressure natural gas of the oil gas well is conveyed to a conveying main pipe from an oil gas bypass port of a gas-liquid separation tank, a manual stop valve II is opened, the high-pressure natural gas enters the high-pressure gas tank from a gas filling port of the high-pressure gas tank through the oil gas bypass port of the gas-liquid separation tank, a one-way valve II, a manual stop valve I and a gas conveying pipeline, and is separated into three pipelines from a control gas port of the high-pressure gas tank to convey the high-pressure gas outwards through a control gas pipe: the liquid level control valve I is conveyed to a liquid storage cavity of the gas-liquid separation tank through a pipeline I, the liquid level control valve I is conveyed to a reversing port C of the pneumatic control three-way valve through a pipeline II, and the liquid level control valve II is conveyed to a liquid level control valve II arranged on the gas-liquid separation tank through a pipeline III; when the liquid level of the liquid stored in the bottom of the gas-liquid separation tank is high, a liquid level control valve II arranged on the gas-liquid separation tank is communicated, high-pressure gas from a control gas port of the high-pressure gas tank acts on a pneumatic control port S of a pneumatic control stop valve through a control gas pipe III and the liquid level control valve II, so that an inlet A and an outlet B of the pneumatic control stop valve are communicated, and liquid in the gas-liquid separation tank is discharged from a liquid inlet of the gas-liquid separation tank to a liquid storage cavity of the gas-liquid separation tank through a liquid outlet of the gas-liquid separation tank, an inlet A and an outlet B of the pneumatic control stop valve and a one-way valve I under the action of natural gas pressure in the tank; when the liquid level of the liquid storage cavity of the gas-liquid isolation tank is high, a liquid level control valve I arranged on the liquid storage cavity of the gas-liquid isolation tank is communicated, high-pressure gas from a control gas port of the high-pressure gas tank acts on a pneumatic control port K of the pneumatic control three-way valve through a control gas pipe I and a liquid level control valve I to enable a pneumatic control three-way inlet A to be communicated with a reversing port C, high-pressure gas from the control gas port of the high-pressure gas tank enters the liquid storage cavity of the gas-liquid isolation tank through a control gas pipe II, the reversing port C of the pneumatic control three-way valve and the inlet A, and liquid in the liquid storage cavity of the gas-liquid isolation tank is discharged to a conveying main pipe behind the one-way valve III from the liquid outlet of the liquid storage cavity of the gas-liquid isolation tank through a pipeline and a one-way valve V under the pressure action of the high-pressure gas in the control gas pipe pipeline II; the one-way valve IV is arranged between the interface of the oil gas cavity and the interface of the liquid storage cavity and is used for ensuring that high-pressure gas in the liquid storage cavity of the gas-liquid isolation tank cannot flow back into the oil gas cavity of the gas-liquid isolation tank; the one-way valve I is used for ensuring that liquid in a liquid storage cavity of the gas-liquid separation tank cannot flow back into the gas-liquid separation tank when the liquid is discharged to the conveying main pipe during the conduction period of the inlet A and the outlet B of the pneumatic control stop valve; when the liquid level of the liquid stored in the bottom of the gas-liquid separation tank is low, a liquid level control valve II arranged on the gas-liquid separation tank is cut off, gas in a pipeline III from a control gas pipe of a control gas port of the high-pressure gas tank cannot enter a pneumatic control port S of the pneumatic control stop valve through the liquid level control valve II, so that an inlet A and an outlet B of the pneumatic control stop valve are cut off, a liquid outlet of the gas-liquid separation tank is not communicated with a liquid inlet of a liquid storage cavity of the gas-liquid separation tank, and the fact that natural gas in the gas-liquid separation tank cannot enter the liquid storage cavity of the gas-liquid separation tank is ensured; when the liquid in the liquid storage cavity of the gas-liquid isolation tank is discharged to the conveying main pipe, the liquid level in the liquid storage cavity of the gas-liquid isolation tank is reduced, so that a liquid level control valve I arranged on the liquid storage cavity of the gas-liquid isolation tank is cut off, gas in a pipeline I of a control air pipe from a control air port of the high-pressure gas tank cannot enter a pneumatic control port K of the pneumatic control three-way valve through the liquid level control valve I, an inlet A and a reversing port C of the pneumatic control three-way valve are cut off, the reversing is conducted to the inlet A and the outlet B of the pneumatic control three-way valve, high-pressure gas in a pipeline II of the control air pipe does not enter the liquid storage cavity of the gas-liquid isolation tank through the inlet A and the reversing port C of the pneumatic control three-way valve, the high-pressure gas stored in the liquid storage cavity of the gas-liquid separation tank is discharged to the oil-gas cavity low-pressure gas port of the gas-liquid separation tank through the high-pressure gas port, the pneumatic control three-way valve inlet A and the pneumatic control three-way valve outlet B, so that the pressure in the liquid storage cavity of the gas-liquid separation tank is reduced, when the pressure in the liquid storage cavity is lower than the pressure in the gas-liquid separation tank, the liquid in the gas-liquid separation tank is discharged to the liquid storage cavity of the gas-liquid separation tank again under the control of the liquid level control valve II and under the action of the natural gas pressure in the tank, the liquid discharge operation is stopped until the liquid level in the liquid storage cavity of the gas-liquid separation tank is not high, and the liquid batch discharge of the liquid in the liquid storage cavity of the gas-liquid separation tank to the liquid storage cavity of the gas-liquid separation tank is completed and the liquid in batches is discharged to the conveying header pipe for multiple times; the liquid entering the conveying main pipe is carried by the natural gas entering the conveying main pipe from the oil gas bypass port of the gas-liquid separation tank and is discharged to the collecting and conveying pipeline of the gas collecting and conveying station, so that the conveying pressure in the collecting and conveying pipeline of the gas collecting and conveying station is reduced, the capability of carrying the underground liquid accumulation of the natural gas in the oil gas well shaft is ensured, and the purpose of controlling the oil-gas separation and discharge of the liquid accumulation in the oil gas well shaft containing the liquid is achieved; manually opening a manual stop valve connected with a drain outlet of the gas-liquid separation tank, and discharging liquid of the gas-liquid separation tank to a liquid conveying vehicle under the action of natural gas pressure in the tank so as to facilitate manual collection of the liquid; the emptying port of the gas-liquid separation tank is connected with a high-pressure emptying valve for protecting the safety of the gas-liquid separation tank; the emptying port of the pure air cavity of the gas-liquid isolation tank is connected with a low-pressure emptying valve for protecting the safety of the gas-liquid isolation tank; a pressure reducing and stabilizing valve is arranged between the natural gas engine and the high-pressure gas tank and is used for ensuring the stability of fuel required by the operation of the natural gas engine;
When the conveying pressure of the oil gas wellhead gas production tree is lower than the pressure of a gas collecting and conveying pipeline of a gas collecting and conveying station, natural gas of the oil gas wellhead gas production tree cannot enter a conveying main pipe through a gas-liquid separation tank to be conveyed to the gas collecting and conveying pipeline of the gas collecting and conveying station, and a one-way valve II is arranged behind a liquid outlet of the gas-liquid separation tank and is used for ensuring that natural gas and liquid in the conveying main pipe cannot flow back into the liquid separation tank; in order to realize pumping, pressure increasing and conveying control on a low-yield oil and gas well, a manual stop valve II is opened at the moment, natural gas in a conveying main pipe is inflated to a high-pressure gas tank from an inflation opening of the high-pressure gas tank through a gas transmission pipeline and the manual stop valve II, and the natural gas entering the high-pressure gas tank is used for providing starting fuel for a natural gas engine; the natural gas in the gas-liquid separation tank is immediately replenished to the pure air cavity, so that the natural gas in the gas-liquid cavity is reduced, the natural gas in the gas-liquid separation tank is replenished to the gas-liquid cavity through the gas outlet, the pressure reducing valve and the gas inlet of the gas-liquid separation tank, and a gas-liquid mixture formed by the accumulated liquid and the natural gas in a well bore of the liquid-containing gas-liquid separation tank is carried onto the gas-liquid well and is replenished to the gas-liquid separation tank through a gas collecting tree, a gas collecting main pipe and a gas-liquid separation tank gas-gas inlet, liquid and low-pressure natural gas are separated from the gas-liquid separation tank, and the low-pressure natural gas is reduced from the outlet through the pipeline and the pressure reducing valve and then enters the gas-liquid separation tank cavity from the gas-gas cavity gas inlet of the gas-liquid separation tank to form a gas-liquid-gas separation tank cavity through the gas-gas outlet and the pressure reducing valve after the natural gas in the gas-liquid separation tank is replenished to the gas-gas cavity through the gas-gas outlet and the gas-liquid-gas-liquid separation tank gas-gas inlet, and the gas-liquid mixture is separated into a gas-liquid-containing gas cavity and a gas-containing gas-liquid and a low-pressure natural gas trap between the gas-gas cavity and a gas-containing gas cavity; the liquid enters a liquid storage cavity of the gas-liquid isolation tank through the one-way valve IV = storage, mist liquid carried in the natural gas is separated by mist catching materials and falls into the bottom of an oil air cavity, pure low-pressure natural gas enters the pure air cavity of the gas-liquid isolation tank and enters an extraction opening of the pumping device through the air outlet and the low-pressure air pipe, so that safe operation of the pumping device is ensured, high-temperature high-pressure natural gas with pressure higher than the pressure of a gas collecting and conveying pipeline of a gas collecting and conveying station is output from the air outlet of the pumping device under the pumping action of the pumping device, enters an air inlet of a cooler through the high-pressure air pipe, is cooled into high-pressure low-temperature natural gas through the cooler, enters a conveying main pipe from the air outlet of the cooler and is conveyed to the gas collecting and conveying pipeline of the gas collecting and conveying station; a small amount of high-pressure low-temperature natural gas cooled by the cooler continuously enters the high-pressure gas tank through the gas inlet of the high-pressure gas tank after being stabilized by the pressure stabilizing valve, and becomes fuel required by continuous operation of the natural gas engine after passing through the pipeline and the pressure reducing and stabilizing valve through the gas outlet of the high-pressure gas tank, so that the natural gas engine is not influenced by the wellhead pressure change of the gas extraction tree of the oil gas wellhead, and the continuous pumping natural gas yield increasing work of the pumping device is ensured; the natural gas entering the high-pressure gas tank is further divided into three pipelines from a control gas port of the high-pressure gas tank through a control gas pipe to convey the high-pressure gas outwards: the liquid is conveyed to a liquid level control valve I through a pipeline I, is conveyed to a reversing port C of a pneumatic control three-way valve through a pipeline II, and is conveyed to a liquid level control valve II through a pipeline III; when the liquid level of the liquid at the bottom of the gas-liquid separation tank is high, a liquid level control valve II is communicated, high-pressure gas from a control gas port of the high-pressure gas tank acts on a pneumatic control port S of the pneumatic control stop valve through a pipeline III, the liquid level control valve II enables an inlet A and an outlet B of the pneumatic control stop valve to be communicated, the liquid of the gas-liquid separation tank is communicated under the action of natural gas pressure in the tank through a liquid outlet of the gas-liquid separation tank, the inlet A and the outlet B of the pneumatic control stop valve and a one-way valve I, the high-pressure gas from the control gas port of the high-pressure gas tank is discharged to a liquid storage cavity of the gas-liquid separation tank from a liquid inlet 8C of the gas-liquid separation tank through a liquid storage port II, a liquid storage port C of the pneumatic control three-way valve and a reversing port A, and the high-pressure gas from the liquid inlet of the liquid storage cavity of the gas separation tank is discharged to a main pipe under the action of the high-pressure gas tank through the pipeline I and the liquid level control valve I acts on the pneumatic control port K of the pneumatic control three-way valve;
When the liquid level of the liquid stored in the tank bottom of the gas-liquid separation tank is low, the liquid level control valve II is cut off, gas in the pipeline III cannot enter the pneumatic control port S of the pneumatic control stop valve through the liquid level control valve II, so that the inlet A and the outlet B of the pneumatic control stop valve are cut off, the liquid outlet of the gas-liquid separation tank is not communicated with the liquid inlet of the liquid storage cavity 8U, and the natural gas in the gas-liquid separation tank cannot enter the liquid storage cavity of the gas-liquid separation tank; when the liquid in the liquid storage cavity is discharged to the conveying main pipe, the liquid level in the liquid storage cavity is reduced, the liquid level control valve I is cut off, gas in the liquid storage cavity cannot enter the pneumatic control port of the pneumatic control three-way valve through the liquid level control valve I, the port A and the reversing port C of the pneumatic control three-way valve are cut off, the reversing is conducted to the inlet A and the outlet B of the pneumatic control three-way valve, the high-pressure gas in the pipeline II does not enter the liquid storage cavity through the inlet A and the reversing port C of the pneumatic control three-way valve, the stored high-pressure gas in the liquid storage cavity is discharged to the low-pressure gas port of the oil gas cavity through the high-pressure gas port, the inlet A and the outlet B of the pneumatic control three-way valve, the pressure in the liquid storage cavity is reduced, and when the pressure in the liquid storage cavity is lower than the pressure in the gas-liquid separation tank, the liquid in the gas-liquid separation tank is discharged to the liquid storage cavity 8U under the control of the liquid level control valve II and the natural gas pressure in the tank until the liquid level in the liquid storage cavity is not high, and then the liquid in the liquid separation tank is discharged to the liquid storage cavity is finished, and the liquid in batches is discharged to the liquid storage cavity and is discharged to the main pipe for multiple times; the liquid entering the conveying main pipe is conveyed to the collecting and conveying pipeline of the collecting and conveying station under the action of pumping pressure of the pumping device and through the cooling device, and then the high-pressure low-temperature natural gas entering the conveying main pipe through the one-way valve III is carried and conveyed to the collecting and conveying pipeline of the collecting and conveying station, so that the conveying pressure in the collecting and conveying pipeline of the collecting and conveying station is reduced, the underground liquid accumulation capacity of the natural gas in a well shaft of the oil and gas well is guaranteed, pumping and production increasing conveying control of the low-yield oil and gas well and oil-gas separation and conveying control of the liquid accumulation in the well shaft of the liquid-containing oil and gas well are realized, the gas-liquid mixture formed by the liquid accumulation in the well shaft of the liquid-containing oil and gas well and the natural gas is continuously carried to the oil and gas well, the deposition of the liquid accumulation in the well shaft of the liquid-containing oil and gas well is eliminated, the liquid blocking is avoided in the well, and the pumping and production increasing functions of the low-yield oil and gas well when the conveying pressure of a gas collecting tree of the oil and gas well is lower than the pressure of the collecting and conveying pipeline of the collecting and conveying station are realized.
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