CN108729875A - A kind of electronic constant pressure valve of adjustable multi-parameters sampling - Google Patents
A kind of electronic constant pressure valve of adjustable multi-parameters sampling Download PDFInfo
- Publication number
- CN108729875A CN108729875A CN201710258923.0A CN201710258923A CN108729875A CN 108729875 A CN108729875 A CN 108729875A CN 201710258923 A CN201710258923 A CN 201710258923A CN 108729875 A CN108729875 A CN 108729875A
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- Prior art keywords
- valve
- storehouse
- flange
- driving machine
- cable
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The present invention relates to a kind of adjustable electronic constant pressure valves of multi-parameters sampling, by storehouse is arranged, parameter setting device, power and data cable, storehouse bolt is set, gasket, baroceptor, control circuit board, valve driving machine storehouse, decelerating motor, oil pressure sensor, axis and seal, baroceptor skirt, sensor holder, flange bolt, flange chassis, oil pressure sensor skirt, valve, articulation, welded pipe forms, the present invention is by oil well air pressure, oil pressure parameter monitoring sensor is built into the valve driving machine control storehouse of electrically operated valve, also detectable gas flow, solve the problems, such as that electric mounting wiring layout is random and explosion-proof protection is difficult, facilitate setting level pressure threshold value, Reasonable casing pressure regulation and control are carried out using the valve, Power Consumption of Pumping Units amount can be reduced, increase oil well output.
Description
Technical field
The present invention relates to petroleum recovering production technology field, specifically a kind of adjustable pressure can carry out multi-parameters sampling
Electronic level pressure valve.
Background technology
In petroleum recovering production process, for producing well also along with many natural gases, this part tubular gas is stored in set
It is referred to as casing gas in pipe, generally takes gas collection manifold to be imported into production liquid pipe remittance, be pipelined to the joint of distant place
It stands in big tank, is acquired and recycles, the common ball valve with spring control pressure in scene, when the pressure of casing gas is preserved
When to certain magnitude, the open-top valve opening of casing gas, but this valve has many drawbacks, coiling machine easily fatigue break first,
The effect of spring level pressure is not only lost, and the spring that fractures makes steel ball be acted on ball seat loss of seal, causes casing gas out of control, occurred
Crude oil pours in down a chimney accident；Since casing gas will produce flow instabilities after sphere, tolerance is excessive to lead to steel ball and ball seat easily
It wears non-round, influences constant pressure valve sealing function；For viscous crude and high solidifying oil, temperature will be solidified at 30 degree or so,
Casing gas preserves process, if the oil solidification in gas collection manifold；Even in addition, thin oil well, when winter production temperature is low, casing
The exhaust manifold of gas can also freeze, and cause to be vented failure to system manifold, casing gas pressure rise makes well fluid level reduce, is
It is pumped into out of pump to casing gas and forms gas lock, influence oil producing operation production.When for winter production, since environment temperature is low, often
Oil solidification in the low pipe of gas collection manifold temperature is often resulted in, produces surge liquid level reduction or even gas lock caused by casing gas row does not go out, sternly
Ghost image rings production of recovering the oil, and is watered ice-melt with engineering truck currently, oil recovery worker takes mostly, or casing gas is directly discharged into air
In, in this way, both causing environmental pollution, there is the security risk for meeting open fire burning, and cause valuable natural gas resource waste, at present
Electronic constant pressure valve is installed in well head, while also needing to individually place oil pressure, casing gas air pressure detection sensor, casing throughput biography
Sensor applies man-hour requirement and drills on existing wellhead manifold and soldered sensor seat, and connects power and signal data line, due to
The requirement of well head explosive-proof grade, electric appliance cable are protected, and the various sensors with lead cause well head messy when installing, easily
It is dangerous to scrape damage, while can also influence oil well well workover construction operation.
Invention content
The present invention intends to provide a kind of electronic constant pressure valve of adjustable multi-parameters sampling, constant pressure valve live can be carried out
Threshold value is adjusted, while can detect oil pressure, the gentle body flow parameter of casing air pressure.
Technical scheme is as follows：
Such electronic constant pressure valve of adjustable multi-parameters sampling, as shown in Figure 1, by joint for sealing cable, cable connector seat, setting
Storehouse, parameter setting device, power and data cable, setting storehouse bolt, gasket, baroceptor, control circuit board, valve driving machine
Storehouse, decelerating motor, oil pressure sensor, axis and seal, baroceptor skirt, sensor holder, flange bolt, flange chassis,
Oil pressure sensor skirt, valve, articulation, welded pipe composition, structure assembled relation is as follows, and valve upper end as shown in Figure 1 is set
There are axis and seal, axis and seal to pass through the centre bore on flange chassis, the axis in axis and seal and reducing motor output shaft
Connection, decelerating motor top are equipped with control circuit board；Valve left end inlet tube end is equipped with the articulation of screwed connection, loose joint
Head outside connecting welding pipe is equipped with baroceptor skirt in the side of left end inlet tube, and skirt passes through flange chassis and sensing
Device seat connects, and sensor holder is equipped with screw thread packing holder, and baroceptor is tightened on sensor holder；Valve right end outlet
End is equipped with the articulation of screwed connection, is equipped with oil pressure sensor skirt in the side of right end outlet, skirt passes through flange
Chassis is connect with another sensor holder, and oil pressure sensor is tightened on the sensor holder；Flange chassis is equipped with seal groove, is set in slot
There is sealing ring, is equipped with multiple bolts hole in flange chassis edge, make-up has the valve driving machine storehouse of hat-type, valve on flange chassis
The bottom of motor bin is equipped with a circle flange edge, and flange is along being equipped with multiple holes corresponding with flange chassis, with multiple bolts by method
Blue chassis is fastened with valve driving machine storehouse flange, and the side in valve driving machine storehouse is set there are one cable connector seat, and screw thread is set in plinth,
Center, which sets biography, has the joint for sealing cable of cable to tighten sealing, the top in valve driving machine storehouse by its end screw thread and cable connector seat
Portion center is equipped with a hole, and the top surface in valve driving machine storehouse is equipped with the setting storehouse of a bowler hat formula, and setting orlop portion is equipped with a circle flange,
Gasket is equipped between flange and valve driving machine silo roof face, flange hole is fixed by the way that storehouse bolt is arranged with valve driving machine the top of the warehouse,
The parameter setting device that toggle switch is equipped in storehouse is set, control circuit board by power and data cable respectively with decelerating motor,
Baroceptor, oil pressure sensor, parameter setting device, cable connection in joint for sealing cable；The left and right weldering of valve as shown in Figure 2
It takes over and is respectively welded on Christmas tree casing air valve pipe side air inlet pipe and petroleum pipeline side escape pipe.
Setting storehouse buckle closure bolt is first opened when use, removes setting warehouse lid, the toggle switch setter in storehouse is set to set
The pipe gas threshold pressure to be controlled, first-class setting storehouse cover bolt are tightened, and the natural gas at this moment put aside in casing passes through casing gas
Valve is filled into air inlet pipe, if the baroceptor being connect with air inlet pipe senses gas pressure by signal and by power and number
It is transmitted to control circuit board according to cable, control circuit board judges when gas pressure is more than the threshold pressure of setting, system control electricity
Movable valve is opened, and gas flows through exhaust pipe by electrically operated valve and delivers gas in manifold production liquid, and gas is conveyed with production liquid
Into neighbouring measuring station or multi-purpose station, when gas pressure is gradually discharged, the pressure of casing gas is continuously decreased when it is less than pressure
When threshold value, control circuit board controls electrically operated valve and closes, and the natural gas in stratum converges in casing again, on pressure is gradual
It rises, until pressure is higher than pressure threshold again, until the arrival that electrically operated valve is opened next time, like this existing on the spot in cycles
The opening and closing of electrically operated valve are realized and control the pressure of casing gas in a reasonable range, realize oil well production increasing drop
Consumption, gas pressure in stratum is with the difference of production technology, and pressure is there is also variation, when needing to reset pressure threshold
When, detachable open up of worker sets storehouse bolt, and with the toggle switch manual setting pressure threshold on parameter setting device, bolt is used again after complete
Fixing seal is good, and control circuit board can be by the continuous monitoring sleeve atmospheric pressure of gas pressure sensor, and oil pressure sensor is only
Have when the valve is closed, with petroleum pipeline side outlet duct occlusion, senses the oil pressure in petroleum pipeline, control circuit board is adopted at this time
The oil pressure sensor parameter value collected is only true petroleum pipeline oil pressure value.
Structure of the invention is novel, and oil well air pressure, oil pressure parameter monitoring sensor are built into the valve driving machine of electrically operated valve
It controls in storehouse, goes back detectable gas flow, solve the independently installed lead between control circuit board of sensor in traditional handicraft
The problem that layout is random and protection is difficult, meanwhile, electrically operated valve can conveniently set up level pressure threshold value, and application is more flexible, using the valve
Door carries out Reasonable casing pressure regulation and control, controls rational well fluid level and casing pressure, can reduce pumping unit produce load, reduces pumping unit
Power consumption increases oil well output, improves oil well whole economic efficiency.
Description of the drawings：
Fig. 1 is the general structure schematic diagram of this patent.
Fig. 2 is the in-site installation schematic diagram of this patent.
Fig. 3 is the schematic diagram of the digital display parameter setting device structure of this patent.
Fig. 4 is the structural schematic diagram that this patent is detected with turbine flow.
Fig. 5 is the structural schematic diagram that this patent is detected with Electromagnetic Flow.
A is casing air valve in each figure, and B is standard oil well production tree, these are all the oil device of standard.
Specific implementation mode：The implementation of the present invention is described further below in conjunction with attached drawing.
As shown in Figure 1, a kind of adjustable electronic constant pressure valve of multi-parameters sampling of the present invention, by joint for sealing cable 1, cable
Plinth 2, setting storehouse 3, parameter setting device 4, power and data cable 5, setting storehouse bolt 6, gasket 7, baroceptor 8,
Control circuit board 9, valve driving machine storehouse 10, decelerating motor 11, oil pressure sensor 12, axis and seal 13, baroceptor skirt
14, sensor holder 15, flange bolt 16, flange chassis 17, oil pressure sensor skirt 18, valve 19, articulation 20, welded pipe 21
Composition, wherein setting storehouse, valve driving machine storehouse, flange chassis are that metal is made, baroceptor skirt 14, oil pressure sensor
Skirt 18 takes thread seal circle to compress or be welded and fixed with flange chassis, baroceptor skirt 14 and valve inlet pipe side
Wall trepanning is welded, and oil pressure sensor skirt 18 is welded with valve export pipe side-wall hole.
Control circuit board 9 is equipped with micro controller, clock, connector socket, serial port module, GPRS module, SIM card, antenna and connects
Wiring, motor control module, 9 collected parameter of control circuit board pass through Serial Port Line, the antenna in power and data cable 5
Parameter is transmitted at a distance, parameter is spread out of by cellular network by antenna and GPRS module, can be connected by serial port data line
It is connected on data collection host, realizes that the wired or wireless communication of serial ports with remote control center, the parameter of communication have oil pressure, set
Pipe air pressure, motor-driven valve on off state, period of switching time etc..
Decelerating motor 11, for the motor with speed reducer, when motor is the motor for having brush brushless, electrically operated valve is
Switching regulator motor-driven valve；When motor is set as stepper motor, Pulse Width Control stepper motor band can be sent out by control circuit board
Movable valve acts, control valve open position, and then control valve uninterrupted, and at this moment valve is electric control valve.
As shown in figure 3, being set on the setting storehouse 3 of the adjustable electronic constant pressure valve of multi-parameters sampling of the present invention and parameter setting device
It is standard electric elements to have toggle switch, toggle switch, is equipped with several group of key, can be formed and compiled by setting ON or setting OFF
Code, such as：00001,11110 multiple combinations, are formed, corresponding different pressure threshold and pressure difference increment size are realized and carried out manually
The setting of pressure threshold and pressure difference increment size.
As shown in figure 3, being the electronic constant pressure valve another kind structure type of adjustable multi-parameters sampling, 3 upper cover of storehouse is set
Or it is equipped with transparent organic glass plate, the parameter setting device 4 in storehouse 3 is set or for equipped with digital display liquid crystal display instrument, digital display liquid crystal
Shield partial pressure dispaly state and setting state, general default pressure dispaly state, the collected air pressure of real-time display and storage
Effective oil pressure value, appliance circuit plate are equipped with functional areas, generally have the functional areas such as " setting ", "+", "-", appliance circuit backboard plate is not
Congenerous region is equipped with several tongue tubes, each tongue tube and circuit board communication, when being configured, by small magnet close to tactile
The tongue tube for sending out " setting " functional area is attracted, the pressure threshold being arranged on display circuit board on digital display liquid crystal display, then is passed through
Magnet triggers "+", "-" region, and pressure threshold parameter is controlled to adjust with this, and after stopping that the several seconds is arranged, system automatically saves
Setting value returns to pressure dispaly state.
As shown in figure 4, being increased with flow detection function for the electronic constant pressure valve of adjustable multi-parameters sampling, in left end
Turbine flow parameter acquisition short circuit, including coil pickoff 23, turbine 24, front and back guide support are increased between inlet tube and valve body
25, the power and signal cable 5 of coil pickoff 23 are introduced into across flow sensing wire barrel 22 in valve driving machine storehouse 10, finally
It is connected in control circuit board 9, in use, gas drives its rotation, coil pickoff 23 to sense turbine when flowing through turbine 24
Signal is transmitted to control circuit board 9, system detectio to gas flow parameter by 24 rotary pulsed amounts by power and signal cable 5.
As shown in figure 5, being increased with flow detection function for the electronic constant pressure valve of adjustable multi-parameters sampling, in left end
Electromagnetic Flow parameter acquisition short circuit is increased between inlet tube and valve body, is equipped with coil pickoff 23 in short circuit outer wall cavity, is led to
It crosses power and signal cable 5 is introduced into across flow sensing wire barrel 22 in valve driving machine storehouse 10, be ultimately connected to control circuit
On plate 9, in use, gas flows through flow sensor tube, coil pickoff 23 senses that electromagnetic signal changes, passes through power and letter
Signal is transmitted to control circuit board 9, system detectio to gas flow parameter by number cable 5.
Claims (6)
1. a kind of electronic constant pressure valve of adjustable multi-parameters sampling, as shown in Figure 1, by joint for sealing cable (1), cable connector seat
(2), storehouse (3), parameter setting device (4), power and data cable (5), setting storehouse bolt (6), gasket (7), air pressure transmission are set
Sensor (8), control circuit board (9), valve driving machine storehouse (10), decelerating motor (11), oil pressure sensor (12), axis and seal
(13), baroceptor skirt (14), sensor holder (15), flange bolt (16), flange chassis (17), oil pressure sensor skirt
(18), electrically operated valve (19), articulation (20), welded pipe (21) composition, structure assembled relation is as follows, and valve (19) upper end is set
There are axis and a seal (13), axis and seal (13) pass through the centre bore of flange chassis (17), the axis of (13) in axis and seal
Axis connection is exported with decelerating motor (11), decelerating motor (11) top is equipped with control circuit board (9)；Valve (19) left end inlet tube
End is equipped with the articulation (20) of screwed connection, articulation (20) outside connecting welding pipe (21), in the side of left end inlet tube
Face is equipped with baroceptor skirt (14), and skirt is connect across flange chassis (17) with sensor holder (15), sensor holder (15)
To be equipped with screw thread packing holder, baroceptor (8) is tightened on sensor holder (15)；Valve (19) right end exports on pipe end
Another articulation (20) equipped with screwed connection is equipped with oil pressure sensor skirt (18) in the side of right end outlet, and skirt is worn
It crosses flange chassis (17) to connect with another sensor holder (15), oil pressure sensor (12) is tightened on the sensor holder (15)；Method
Blue chassis (17) is equipped with seal groove, and sealing ring is equipped in slot, and multiple bolts hole, flange chassis are equipped at flange chassis (17) edge
(17) make-up has the valve driving machine storehouse (10) of hat-type, the bottom of valve driving machine storehouse (10) to be equipped with a circle flange edge, flange edge on
Multiple holes corresponding with flange chassis (17) are equipped with, with multiple bolts by flange chassis (17) and valve driving machine storehouse (10) flange
Fastening, the side of valve driving machine storehouse (10) are set there are one cable connector seat (2), set screw thread in plinth, center, which sets biography, cable
Joint for sealing cable (1) sealing is tightened by its end screw thread and cable connector seat (2), in the top of valve driving machine storehouse (10)
The heart is equipped with a hole, and the top surface of valve driving machine storehouse (10) is equipped with the setting storehouse (3) of a bowler hat formula, and setting storehouse (3) bottom is equipped with one
Flange is enclosed, gasket (7) is equipped between flange and valve driving machine storehouse (10) top surface, flange hole is by being arranged storehouse bolt (6) and valve
It is fixed at the top of door motor storehouse (10), the parameter setting device (4) of toggle switch is equipped in setting storehouse (3), control circuit board (9) passes through
Power and data cable (5) respectively with decelerating motor (11), baroceptor (8), oil pressure sensor (12), parameter setting device
(4), the interior cable connection of joint for sealing cable (1)；The left and right welded pipe (21) of valve (19) as shown in Figure 2 is respectively welded at oil recovery
It sets on casing gas valved tube side air inlet pipe and petroleum pipeline side escape pipe.
2. a kind of adjustable electronic constant pressure valve of multi-parameters sampling according to claim 1, it is characterised in that：Storehouse is arranged in it
(3) upper cover or it is equipped with transparent organic glass plate, parameter setting device (4) in setting storehouse (3) or for equipped with digital display liquid crystal display instrument
Table, appliance circuit backboard plate different function region are equipped with several tongue tubes, tongue tube and circuit board communication.
3. a kind of adjustable electronic constant pressure valve of multi-parameters sampling according to claim 1, it is characterised in that：Control electricity
Road plate (9) is equipped with micro controller, clock, connector socket, serial port module, GPRS module, SIM card, antenna connecting line, control circuit
Parameter is transmitted at a distance by Serial Port Line, the antenna in power and data cable (5), passes through day by plate (9) collected parameter
Line and GPRS module spread out of parameter by cellular network, may be coupled on data collection host by serial port data line, realize
It is communicated with remote control center.
4. a kind of adjustable electronic constant pressure valve of multi-parameters sampling according to claim 1, it is characterised in that：Decelerating motor
(11) or it is decelerating step motor.
5. a kind of adjustable electronic constant pressure valve of multi-parameters sampling according to claim 1, it is characterised in that：Such as Fig. 4 institutes
Show, acquiring electronic constant pressure valve for adjustable parameter increases with flow detection function, increases between left end inlet tube and valve body
Turbine flow parameter acquisition short circuit, including coil pickoff (23), turbine turbine (24), front and back guide support (25), line are added
The power and signal cable (5) of coil sensor (23) are introduced into across flow sensing wire barrel (22) in valve driving machine storehouse (10).
6. a kind of adjustable electronic constant pressure valve of multi-parameters sampling according to claim 1, it is characterised in that：Such as Fig. 5 institutes
Show, acquiring electronic constant pressure valve for adjustable parameter increases with flow detection function, increases between left end inlet tube and valve body
Electromagnetic Flow parameter acquisition short circuit is added, has been equipped with coil pickoff (23) in short circuit outer wall cavity, passes through power and signal wire
Cable (5) is introduced into across flow sensing wire barrel (22) in valve driving machine storehouse (10), is ultimately connected in control circuit board (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258923.0A CN108729875A (en) | 2017-04-19 | 2017-04-19 | A kind of electronic constant pressure valve of adjustable multi-parameters sampling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258923.0A CN108729875A (en) | 2017-04-19 | 2017-04-19 | A kind of electronic constant pressure valve of adjustable multi-parameters sampling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108729875A true CN108729875A (en) | 2018-11-02 |
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ID=63924335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710258923.0A Pending CN108729875A (en) | 2017-04-19 | 2017-04-19 | A kind of electronic constant pressure valve of adjustable multi-parameters sampling |
Country Status (1)
| Country | Link |
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| CN (1) | CN108729875A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622867A (en) * | 2021-08-04 | 2021-11-09 | 北京金圣奥能源技术有限公司 | Gas well gas production system based on differential valve and control method thereof |
| CN115288636A (en) * | 2022-08-08 | 2022-11-04 | 四川昊雒石油科技有限公司 | Gas well composite stage type pressure control production system |
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| CN102269330A (en) * | 2011-04-28 | 2011-12-07 | 煤炭科学研究总院重庆研究院 | Pressure controller for coal bed gas gathering and transportation pipeline |
| CN202381037U (en) * | 2011-11-25 | 2012-08-15 | 中国石油天然气股份有限公司 | Oil well casing constant pressure air release valve |
| CN202402729U (en) * | 2011-12-31 | 2012-08-29 | 杭州哲达科技股份有限公司 | Intelligent dynamic balance pneumatic regulating valve |
| CN202510811U (en) * | 2012-04-17 | 2012-10-31 | 常州汉腾自动化设备有限公司 | Intelligent electric pressure stabilizing and reducing balance valve |
| CN203743573U (en) * | 2014-03-18 | 2014-07-30 | 欧文凯利自控阀（上海）有限公司 | Electrically-operated intelligent regulating valve |
| CN205714170U (en) * | 2016-03-23 | 2016-11-23 | 濮阳市永辉仪表有限公司 | Oil well intelligent producing fluid level monitoring device |
-
2017
- 2017-04-19 CN CN201710258923.0A patent/CN108729875A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269330A (en) * | 2011-04-28 | 2011-12-07 | 煤炭科学研究总院重庆研究院 | Pressure controller for coal bed gas gathering and transportation pipeline |
| CN202381037U (en) * | 2011-11-25 | 2012-08-15 | 中国石油天然气股份有限公司 | Oil well casing constant pressure air release valve |
| CN202402729U (en) * | 2011-12-31 | 2012-08-29 | 杭州哲达科技股份有限公司 | Intelligent dynamic balance pneumatic regulating valve |
| CN202510811U (en) * | 2012-04-17 | 2012-10-31 | 常州汉腾自动化设备有限公司 | Intelligent electric pressure stabilizing and reducing balance valve |
| CN203743573U (en) * | 2014-03-18 | 2014-07-30 | 欧文凯利自控阀（上海）有限公司 | Electrically-operated intelligent regulating valve |
| CN205714170U (en) * | 2016-03-23 | 2016-11-23 | 濮阳市永辉仪表有限公司 | Oil well intelligent producing fluid level monitoring device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622867A (en) * | 2021-08-04 | 2021-11-09 | 北京金圣奥能源技术有限公司 | Gas well gas production system based on differential valve and control method thereof |
| CN115288636A (en) * | 2022-08-08 | 2022-11-04 | 四川昊雒石油科技有限公司 | Gas well composite stage type pressure control production system |
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Application publication date: 20181102 |