CN111749654A - Method and system for controlling gas well plunger gas lift drainage gas recovery - Google Patents
Method and system for controlling gas well plunger gas lift drainage gas recovery Download PDFInfo
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- CN111749654A CN111749654A CN202010775083.7A CN202010775083A CN111749654A CN 111749654 A CN111749654 A CN 111749654A CN 202010775083 A CN202010775083 A CN 202010775083A CN 111749654 A CN111749654 A CN 111749654A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title claims description 11
- 239000007789 gas Substances 0.000 claims abstract description 135
- 238000004519 manufacturing process Methods 0.000 claims abstract description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003345 natural gas Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 230000000630 rising effect Effects 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 17
- 239000012528 membrane Substances 0.000 claims description 17
- 230000002265 prevention Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/16—Control means therefor being outside the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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Abstract
The invention relates to the technical field of natural gas field development and discloses a method for controlling gas well plunger gas lift drainage gas productionOpening deviceShut-in pressure PClosing deviceAnd plunger optimum rise time T; data processor receives the jacket pressure P1Data and compare P1And POpening deviceControlling the opening and closing of the gas well; after the well is opened, the data processor compares the actual rise time T of the plunger1And the size of T, controlling the opening and closing of the gas well; when the well is continuously opened, the data processor continuously receives casing pressure P1Numerical value, comparison P1And PClosing deviceControlling the opening and closing of the gas well; electromagnetic valve receives gas well switch command and controlsAnd (3) opening a film-making thin valve and closing a gas well. Because the total pressure in the stratum is constant, and the oil and casing pressure difference reflects the accumulated liquid volume of the shaft, the invention sets the well opening and closing pressure of the gas well through the oil casing pressure difference, controls the opening and closing of the gas well through comparing the casing pressure with the set well opening and closing pressure, and obviously reduces the difficulty of manual management.
Description
Technical Field
The invention relates to the technical field of natural gas field development, in particular to a method and a system for controlling plunger gas lift water drainage and gas production.
Background
When the plunger is used for gas production by gas lift drainage, the bottom of the plunger is provided with a valve, when the plunger is below oil, the valve is in an open state, and the oil enters an oil pipe; when the plunger hits a bumper at the bottom of the well, the valve closes; when the pressure of gas gathered by the gas well or injected gas is enough, the gas lift pushes the plunger to rise to lift oil out, and the valve is opened when the plunger continues to rise to a wellhead buffer; after the gas lifting and discharging are finished, the plunger falls below the oil liquid by the dead weight to continue oil feeding; this lifts the oil to the surface in cycles.
Under the conventional condition, the electromagnetic switch valve is timed to be commanded to open and close the gas well through the wellhead installation controller, so that the plunger can run up and down, and automatic control is achieved. The alarm clock type timing well switching mode is based on the comprehensive analysis of gas well operation parameters, the time period of the well switching is set manually, and the plunger gas lift controller switches the well in a timing mode according to the time period.
However, as the production time is prolonged, the pressure of the gas well is gradually reduced, and the switching time of the gas well needs to be manually redesigned, so that the difficulty of manual management is increased.
Disclosure of Invention
The invention provides a method and a system for controlling drainage and gas production of gas well plunger gas lift, which solve the problem of difficulty in plunger gas lift management caused by pressure change of a gas well.
The invention is realized by the following scheme:
a method for controlling a gas well plunger gas lift drainage gas production system comprises the following steps:
a. setting a well opening pressure P on a data processor wirelessly connected with a wellhead data acquisition controller through an RTUOpening deviceShut-in pressure PClosing deviceAnd plunger optimum rise time T;
b. the data acquisition controller is connected with an air pressure sensor arranged on the gas production tree sleeve, and acquires the sleeve pressure P on the gas production tree sleeve detected by the air pressure sensor1And wirelessly transmitted to a data processor through an RTU; data processor comparison P1、POpening deviceThe size of (2): when P is present1<POpening deviceContinuously receiving the jacket pressure P1(ii) a When P is present1≧POpening deviceAnd P is1Generating a well opening command when the well opening command is stable;
the data acquisition controller is connected with an electromagnetic valve arranged on a natural gas production pipeline, wirelessly receives a well opening command through an RTU and transmits the well opening command to the electromagnetic valve, and the electromagnetic valve is connected with a membrane valve arranged at a well mouth to control the membrane valve to open the well;
c. the data acquisition controller is connected with a position detection device arranged on the blowout prevention pipe; after the well is opened, the data acquisition controller acquires the time T when the position detection device detects that the plunger rises to the blowout prevention pipebAnd wirelessly transmitted to a data processor through an RTU; the data processor calculates the time TbAt the time T when the gas well is openedaDifference value T of1Comparison of T1Size of T:
when T is1And ≧ T, continuously opening the well;
when T is1<T, judging that the plunger arrives too fast, generating a well closing command by the data processor, wirelessly receiving the well closing command by the RTU for data acquisition, transmitting the well closing command to the electromagnetic valve, controlling the membrane valve to close the well by the electromagnetic valve, checking the reason of the too fast arrival after the well is closed, and returning to the step b after the checking is finished;
d. when the well is continuously opened, oil and natural gas are continuously lifted, liquid begins to accumulate in the underground oil pipe, and the casing pressure P is achieved1Continuously descending; the data processor continuously receives the jacket pressure P1Of comparison P1、PClosing deviceThe size of (2): when P is present1≧PClosing deviceContinuously opening the well; when P is present1<PClosing deviceAnd P is1Stabilizing, and generating a well closing command by the data processor;
the data acquisition controller wirelessly receives a shut-in command through the RTU and transmits the shut-in command to the electromagnetic valve, and the electromagnetic valve controls the membrane valve to shut-in;
e. after shut-in, casing pressure P1And c, stably rising, and repeatedly executing the step b, the step c and the step d.
Further, after the well is continuously opened in the step C, oil and natural gas are continuously discharged, liquid is accumulated in the underground oil pipe, and the casing pressure P is achieved1Is continuously loweredTo a minimum value of jacket pressure PminThen, the pressure rises back, and a priori value △ P of the pressure of the back rise is set;
in step a, △ P is used for replacing shut-in pressure PClosing device；
Step a, setting the well opening pressure P on a data processor wirelessly connected with a wellhead data acquisition controller through an RTUOpening device△ P and plunger optimum rise time T;
in step d, using the sleeve pressure P1And a minimum value of jacket pressure PminDifference value of (1), i.e. back-lift jacket pressure value △ P1Alternative sleeve pressure P1；
Step d is as follows: the data acquisition controller acquires the minimum casing pressure value P detected by the pressure sensorminAnd the sleeve pressure P1And wirelessly transmitting the data to a data processor through an RTU; data processor calculates the cuff pressure P1And a minimum value of jacket pressure PminThe difference is recorded as the rising jacket pressure value △ P1And comparing △ P1△ P size when △ P1△ P, continuously opening the well when △ P1>△ P, the data processor generates a shut-in command;
the data acquisition controller wirelessly receives a shut-in command through the RTU and transmits the shut-in command to the electromagnetic valve, and the electromagnetic valve controls the membrane valve to shut-in.
Further, the shut-in pressure PClosing deviceIs the minimum value of the casing pressure PminAnd a back-rising jacket pressure value of △ P1Of (a) or (b), i.e. PClosing device＝Pmin+△P1。
Furthermore, the RTUs are respectively arranged at the wellhead and the remote data processor, and remote data transmission between the wellhead data acquisition controller and the remote data processor is realized through the two RTUs.
Furthermore, an oil pressure sensor is also arranged on an oil pipe of the gas production tree and used for detecting the pressure O of the oil at the bottom of the wellOilBy the pressure of oil OOilAnd a sleeve pressure P1To set the well opening pressure POpening deviceAnd shut-in pressure PClosing device。
Furthermore, a flowmeter for detecting the flow rate of the liquid and the natural gas produced by the gas well is also arranged on a natural gas production pipeline of the wellhead.
The control system in the method for controlling gas well plunger gas lift drainage gas production comprises an air pressure sensor arranged on a gas production tree sleeve, an oil pressure sensor on an oil pipe, an electromagnetic valve and a flowmeter on a gas production pipeline, and a position detection device arranged on a lubricator;
the input end of the data acquisition controller is connected with the air pressure sensor, the oil pressure sensor, the flowmeter and the position detection device, and the output end of the data acquisition controller is connected with the electromagnetic valve and the first remote terminal unit; the second remote terminal unit is wirelessly connected to the first remote terminal unit and is connected to the data processor.
Further, the air pressure sensor, the hydraulic sensor, the flow meter and the position detection device respectively detect sleeve pressure, oil pressure, gas flow and plunger rising time and then transmit the sleeve pressure, the oil pressure, the gas flow and the plunger rising time to the data acquisition controller;
the data acquisition controller internally processes acquired data and then sends the data to the second remote terminal unit through the first remote terminal unit;
the second remote terminal unit receives the data signal and then transmits the data signal to the data processor for analysis, and a gas well switching command is generated; the second remote terminal unit sends the gas well switching command to the first remote terminal unit;
and after the first remote terminal unit receives a gas well switching command, the electromagnetic valve is controlled according to the gas well switching command signal, and then the membrane valve is controlled to be opened and the gas well is controlled to be closed.
The invention has the following advantages:
because the total pressure in the stratum is constant, the pressure difference between oil and casing pressure reflects the accumulated liquid volume of the shaft, and the switching pressure of the gas well is set through the pressure difference; based on the method, the casing pressure of the gas production tree casing is detected through the gas sensor, the casing pressure is received through the data processor and then compared with the set well opening and closing pressure, and the switch of the gas well is determined according to the comparison condition; after the well is opened, the time when the plunger rises to the blowout preventer is detected through the position detection device, the actual rising time of the plunger is calculated by the data processor and is compared with the set rising time, and the well is determined to be closed for maintenance or be opened continuously according to the condition; the alarm clock type well opening and closing time is not required to be set, automatic control is realized by comparing casing pressure with well opening and closing pressure, and the difficulty in manual management is obviously reduced.
Drawings
FIG. 1 is a flowchart of a method of controlling a plunger gas lift water drainage gas recovery system according to embodiment 1;
FIG. 2 is a flowchart of a method of controlling a plunger gas lift water drainage gas recovery system according to embodiment 2;
FIG. 3 is a structural connection diagram of a plunger gas lift drainage gas recovery system;
in the figure: the system comprises an air pressure sensor 1, an oil pressure sensor 2, an electromagnetic valve 3, a flowmeter 4, a position detection device 5, a data acquisition controller 6, a first-stroke terminal unit 7, a second-stroke terminal unit 8 and a data processor 9.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
A method of controlling a plunger gas lift drainage gas recovery system, as shown in fig. 1, comprising the steps of:
a. setting a well opening pressure P on a data processor wirelessly connected with a wellhead data acquisition controller through an RTUOpening deviceShut-in pressure PClosing deviceAnd plunger optimum rise time T;
b. the data acquisition controller is connected with an air pressure sensor arranged on the gas production tree sleeve, and acquires the sleeve pressure P on the gas production tree sleeve detected by the air pressure sensor1And wirelessly transmitted to a data processor through an RTU; data processor comparison P1、POpening deviceThe size of (2): when P is present1<POpening deviceContinuously receiving the jacket pressure P1(ii) a When P is present1≧POpening deviceAnd P is1Generating a well opening command when the well opening command is stable;
the data acquisition controller is connected with an electromagnetic valve arranged on a natural gas production pipeline, wirelessly receives a well opening command through an RTU and transmits the well opening command to the electromagnetic valve, and the electromagnetic valve is connected with a membrane valve arranged at a well mouth to control the membrane valve to open the well;
c. data acquisition controller and device for preventing blowoutThe position detecting device on the pipe is connected; after the well is opened, the data acquisition controller acquires the time T when the position detection device detects that the plunger rises to the blowout prevention pipebAnd wirelessly transmitted to a data processor through an RTU; the data processor calculates the time TbAt the time T when the gas well is openedaDifference value T of1Comparison of T1Size of T:
when T is1And ≧ T, continuously opening the well;
when T is1<T, judging that the plunger arrives too fast, generating a well closing command by the data processor, wirelessly receiving the well closing command by the RTU for data acquisition, transmitting the well closing command to the electromagnetic valve, controlling the membrane valve to close the well by the electromagnetic valve, checking the reason of the too fast arrival after the well is closed, and returning to the step b after the checking is finished;
d. when the well is continuously opened, oil and natural gas are continuously lifted, liquid begins to accumulate in the underground oil pipe, and the casing pressure P is achieved1Continuously descending; the data processor continuously receives the jacket pressure P1Of comparison P1、PClosing deviceThe size of (2): when P is present1≧PClosing deviceContinuously opening the well; when P is present1<PClosing deviceAnd P is1Stabilizing, and generating a well closing command by the data processor;
the data acquisition controller wirelessly receives a shut-in command through the RTU and transmits the shut-in command to the electromagnetic valve, and the electromagnetic valve controls the membrane valve to shut-in;
e. after shut-in, casing pressure P1And c, stably rising, and repeatedly executing the step b, the step c and the step d.
The RTUs are respectively arranged at the well head and the remote data processor, and remote data transmission between the well head data acquisition controller and the remote data processor is realized through the two RTUs.
An oil pressure sensor is also arranged on the oil pipe of the gas production tree and detects the pressure O of the oil at the bottom of the wellOilBy the pressure of oil OOilAnd a sleeve pressure P1To set the well opening pressure POpening deviceAnd shut-in pressure PClosing device。
A flowmeter for detecting the flow rate of liquid and natural gas produced by the gas well is also arranged on a natural gas production pipeline of the wellhead.
According to the method, whether the well is opened or not is determined by comparing the casing pressure of the gas well with the well opening pressure, whether the gas well normally operates or not is judged by comparing the rising time of the plunger with the theoretical rising time, and whether the well is closed or not is controlled according to the value of the casing pressure after the casing pressure is reduced and the well closing pressure in the water drainage and gas production process. In the whole process, the gas well is switched on and off only by controlling the casing pressure and setting the opening and closing pressures, so that the problem of high manual management difficulty caused by timing control of the gas well switch through a control electromagnetic valve is solved.
Example 2
The difference from example 1 is: as shown in fig. 2, after the well is opened continuously in the step C, the oil and the natural gas are continuously discharged, and the liquid accumulation and the casing pressure P in the underground oil pipe are realized1Continuously decreases to the minimum casing pressure value PminThen, the pressure rises back, and a priori value △ P of the pressure of the back rise is set;
in step a, △ P is used for replacing shut-in pressure PClosing device；
Step a, setting the well opening pressure P on a data processor wirelessly connected with a wellhead data acquisition controller through an RTUOpening device△ P and plunger optimum rise time T;
in step d, using the sleeve pressure P1And a minimum value of jacket pressure PminDifference value of (1), i.e. back-lift jacket pressure value △ P1Alternative sleeve pressure P1；
Step d is as follows: the data acquisition controller acquires the minimum casing pressure value P detected by the pressure sensorminAnd the sleeve pressure P1And wirelessly transmitting the data to a data processor through an RTU; data processor calculates the cuff pressure P1And a minimum value of jacket pressure PminThe difference is recorded as the rising jacket pressure value △ P1And comparing △ P1△ P size when △ P1△ P, continuously opening the well when △ P1>△ P, the data processor generates a shut-in command;
the data acquisition controller wirelessly receives a shut-in command through the RTU and transmits the shut-in command to the electromagnetic valve, and the electromagnetic valve controls the membrane valve to shut-in.
During the actual control process, the oil pressure O in the well is generated during the discharging process of the oil liquid and the natural gas1Will be slightly lessA slight increase in, and thus, the packing pressure P1Continuously dropping to a minimum pressure knee value PminThen there will be a slight lift-back, so this embodiment controls the shut-down of the gas well by controlling the magnitude of the casing pressure lift-back.
According to the method, whether the well is opened or not is determined by comparing the casing pressure of the gas well with the opening pressure of the well, whether the gas well normally operates or not is judged according to the comparison between the rising time of the plunger and the theoretical rising time, and whether the well is closed or not is controlled according to the rising value of the casing pressure after the casing pressure is reduced to the minimum value in the drainage gas production process and the set rising value. In the whole process, the gas well is switched on and off only by controlling casing pressure, setting well opening pressure and setting a rebound value, and the problem of high manual management difficulty caused by controlling the gas well to switch on and off by controlling an electromagnetic valve is solved.
It should be noted that: shut-in pressure PClosing deviceIs the minimum value of the casing pressure PminAnd a back-rising jacket pressure value of △ P1Of (a) or (b), i.e. PClosing device＝Pmin+△P1。
Example 3
A gas well plunger gas lift drainage gas production control system, as shown in fig. 3, comprises a gas pressure sensor 1 arranged on a gas production tree sleeve, an oil pressure sensor 2 on an oil pipe, an electromagnetic switch valve 3 and a flowmeter 4 on a gas production pipeline, and a position detection device 5 arranged on a lubricator;
the input end of the data acquisition controller 6 is connected with the air pressure sensor 1, the oil pressure sensor 2, the flowmeter 4 and the position detection device 5, and the output end of the data acquisition controller is connected with the electromagnetic switch valve 3 and the first remote terminal unit 7; the second remote terminal unit 8 is wirelessly connected to the first remote terminal unit 7 and is connected to the data processor 9.
The control system comprises the following steps:
the air pressure sensor 1, the hydraulic sensor 2, the flow meter 4 and the position detection device 5 respectively detect sleeve pressure, oil pressure, gas flow and plunger rising time and then transmit the sleeve pressure, the oil pressure, the gas flow and the plunger rising time to the data acquisition controller 6;
the data acquisition controller 6 internally processes the acquired data and sends the processed data to the second remote terminal unit 8 through the first remote terminal unit 7; the second remote terminal unit 8 receives the data signal and transmits the data signal to the data processor 9 for analysis, a gas well switching command is generated, and the second remote terminal unit 8 sends the gas well switching command to the first remote terminal unit 7; and after receiving the gas well switching command, the first remote terminal unit 7 controls the start and stop of the electromagnetic switch valve 3 according to the gas well switching command signal, and further controls the diaphragm valve to execute the gas well opening command.
The control system transmits the detected value of the casing pressure to the data processor in time, and transmits the casing pressure of the wellhead in time and accurately, so that the data processor can judge the casing pressure and the set opening and closing pressure conveniently, and the gas well can be opened and closed accurately; in the process, the position detection device acquires the actual rising time of the plunger, so that the data processor can compare the actual rising time of the plunger with the set rising time to judge whether the gas well normally runs; through the data processor provided with the remote terminal, remote transmission and interaction of data are realized, more accurate and timely control over the gas well can be realized, and the difficulty in considering management is obviously reduced.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (8)
1. A method for controlling a gas well plunger gas lift drainage gas production system is characterized by comprising the following steps:
a. setting a well opening pressure P on a data processor wirelessly connected with a wellhead data acquisition controller through an RTUOpening deviceShut-in pressure PClosing deviceAnd plunger optimum rise time T;
b. the data acquisition controller is connected with an air pressure sensor arranged on the gas production tree sleeve, and acquires the sleeve pressure P on the gas production tree sleeve detected by the air pressure sensor1And wirelessly transmitted to a data processor through an RTU; data processor comparison P1、POpening deviceThe size of (2): when P is present1<POpening deviceContinuously receiving the jacket pressure P1(ii) a When P is present1≧POpening deviceAnd P is1Generating a well opening command when the well opening command is stable;
the data acquisition controller is connected with an electromagnetic valve arranged on a natural gas production pipeline, wirelessly receives a well opening command through an RTU and transmits the well opening command to the electromagnetic valve, and the electromagnetic valve is connected with a membrane valve arranged at a well mouth to control the membrane valve to open the well;
c. the data acquisition controller is also connected with a position detection device arranged on the blowout prevention pipe; after the well is opened, the data acquisition controller acquires the time T when the position detection device detects that the plunger rises to the blowout prevention pipebAnd wirelessly transmitted to a data processor through an RTU; the data processor calculates the time TbAt the time T when the gas well is openedaDifference value T of1Comparison of T1Size of T:
when T is1And ≧ T, continuously opening the well;
when T is1<T, judging that the plunger arrives too fast, generating a well closing command by the data processor, wirelessly receiving the well closing command by the data acquisition controller through the RTU and transmitting the well closing command to the electromagnetic valve, controlling the membrane valve to close the well by the electromagnetic valve, checking the reason of the too fast arrival after the well is closed, and returning to the step b after the check is finished;
d. when the well is continuously opened, oil and natural gas are continuously lifted, liquid begins to accumulate in the underground oil pipe, and the casing pressure P is achieved1Continuously descending; the data processor continuously receives the jacket pressure P1Of comparison P1、PClosing deviceThe size of (2): when P is present1≧PClosing deviceContinuously opening the well; when P is present1<PClosing deviceAnd P is1Stabilizing, and generating a well closing command by the data processor;
the data acquisition controller wirelessly receives a shut-in command through the RTU and transmits the shut-in command to the electromagnetic valve, and the electromagnetic valve controls the membrane valve to shut-in;
e. after shut-in, casing pressure P1And c, stably rising, and repeatedly executing the step b, the step c and the step d.
2. The method of controlling gas well plug gas lift drainage gas recovery as set forth in claim 1, wherein: after the well is continuously opened in the step C, oil and natural gas are continuously discharged, liquid is accumulated in the underground oil pipe, and the casing pressure P is achieved1Continuously decreases to the minimum casing pressure value PminThen, the pressure rises back, and a priori value △ P of the pressure of the back rise is set;
in step a, △ P is used for replacing shut-in pressure PClosing device；
Step a, setting the well opening pressure P on a data processor wirelessly connected with a wellhead data acquisition controller through an RTUOpening device△ P and plunger optimum rise time T;
in step d, using the sleeve pressure P1And a minimum value of jacket pressure PminDifference value of (1), i.e. back-lift jacket pressure value △ P1Alternative sleeve pressure P1；
Step d is as follows: the data acquisition controller acquires the minimum casing pressure value P detected by the pressure sensorminAnd the sleeve pressure P1And wirelessly transmitting the data to a data processor through an RTU; data processor calculates the cuff pressure P1And a minimum value of jacket pressure PminThe difference is recorded as the rising jacket pressure value △ P1And comparing △ P1△ P size when △ P1△ P, continuously opening the well when △ P1>△ P, the data processor generates a shut-in command;
the data acquisition controller wirelessly receives a shut-in command through the RTU and transmits the shut-in command to the electromagnetic valve, and the electromagnetic valve controls the membrane valve to shut-in.
3. The method for controlling gas well plug gas lift drainage gas recovery as claimed in claim 1 or 2, wherein: the shut-in pressure PClosing deviceIs the minimum value of the casing pressure PminAnd a back-rising jacket pressure value of △ P1Of (a) or (b), i.e. PClosing device＝Pmin+△P1。
4. The method of controlling gas well plug gas lift drainage gas recovery as set forth in claim 3, wherein: the RTUs are respectively arranged at the well head and the remote data processor, and remote data transmission between the well head data acquisition controller and the remote data processor is realized through the two RTUs.
5. The method of controlling gas well plug gas lift drainage gas recovery as set forth in claim 4, wherein: in thatAn oil pressure sensor is also arranged on the oil pipe of the gas production tree and detects the pressure O of the oil at the bottom of the wellOilBy the pressure of oil OOilAnd a sleeve pressure P1To set the well opening pressure POpening deviceAnd shut-in pressure PClosing device。
6. The method of controlling gas well plug gas lift drainage gas recovery as set forth in claim 5, wherein: a flowmeter for detecting the flow rate of liquid and natural gas produced by the gas well is also arranged on a natural gas production pipeline of the wellhead.
7. A gas well plunger gas lift drainage gas production control system is characterized by comprising a gas pressure sensor (1) arranged on a gas production tree sleeve, an oil pressure sensor (2) on an oil pipe, an electromagnetic switch valve (3) and a flowmeter (4) on a gas production pipeline, and a position detection device (5) arranged on a lubricator;
the input end of the data acquisition controller (6) is connected with the air pressure sensor (1), the oil pressure sensor (2), the flowmeter (4) and the position detection device (5), and the output end of the data acquisition controller is connected with the electromagnetic switch valve (3) and the first remote terminal unit (7); the second remote terminal unit (8) is wirelessly connected to the first remote terminal unit (7) and is connected to the data processor (9).
8. The gas well plunger gas lift drainage gas production control system as claimed in claim 7, characterized in that the gas pressure sensor (1), the hydraulic pressure sensor (2), the flow meter (4) and the position detection device (5) respectively detect the sleeve pressure, the oil pressure, the gas flow and the plunger position rising time and then transmit the detected values to the data acquisition controller (6);
the data acquisition controller (6) converts the acquired data and sends the converted data to the second remote terminal unit (8) through the first remote terminal unit (7);
the second remote terminal unit (8) receives the data signal and then transmits the data signal to the data processor (9) for analysis, and a gas well switching command is generated; and transmitting gas well switching commands to the first remote terminal unit (7) by the second remote terminal unit (8);
after receiving the gas well switching command, the first remote terminal unit (7) controls the electromagnetic valve (3) according to the gas well switching command signal, and further controls the membrane valve to open and close the gas well.
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| CN202010775083.7A CN111749654A (en) | 2020-08-05 | 2020-08-05 | Method and system for controlling gas well plunger gas lift drainage gas recovery |
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| CN202010775083.7A CN111749654A (en) | 2020-08-05 | 2020-08-05 | Method and system for controlling gas well plunger gas lift drainage gas recovery |
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| CN112943179A (en) * | 2021-01-14 | 2021-06-11 | 中国石油天然气股份有限公司 | Plunger gas lift production system optimization control method |
| CN113338871A (en) * | 2021-07-22 | 2021-09-03 | 辽宁众联石油天然气有限公司 | Gas well control system |
| CN114673476A (en) * | 2022-04-22 | 2022-06-28 | 托普威尔石油技术股份公司 | Unconventional gas well intelligent pressure control system and method |
| CN114996662A (en) * | 2022-08-08 | 2022-09-02 | 成都英沃信科技有限公司 | Method for determining plunger well shaft accumulated liquid amount |
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