CN112796707A - Unattended intelligent wellhead safety control system and control method thereof - Google Patents
Unattended intelligent wellhead safety control system and control method thereof Download PDFInfo
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- CN112796707A CN112796707A CN202011629606.3A CN202011629606A CN112796707A CN 112796707 A CN112796707 A CN 112796707A CN 202011629606 A CN202011629606 A CN 202011629606A CN 112796707 A CN112796707 A CN 112796707A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000002265 prevention Effects 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000004590 computer program Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 239000010720 hydraulic oil Substances 0.000 description 13
- 239000003921 oil Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000003345 natural gas Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000002343 natural gas well Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003208 petroleum Substances 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0021—Safety devices, e.g. for preventing small objects from falling into 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
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The application relates to an unattended intelligent wellhead safety control system and a control method thereof, which comprises an underground safety valve, a ground safety valve and a hydraulic power module, the hydraulic power module provides working pressure for a working loop where the underground safety valve and the ground safety valve are located so as to open the underground safety valve and the ground safety valve, the hydraulic power module is coupled with a pressure detection module which is used for detecting the magnitude of the working pressure and outputting a working pressure signal, the pressure detection module is coupled with a control module, a working pressure reference value is preset in the control module, the control module is used for comparing the working pressure signal value with the working pressure reference value so as to output a control signal to the hydraulic power module, and the hydraulic power module outputs working pressure required by the underground safety valve and the ground safety valve after receiving the control signal. This application has the effect that realizes unmanned on duty, and can conveniently open downhole safety valve and ground relief valve.
Description
Technical Field
The application relates to the technical field of well heads of production wells in the petroleum and gas industry, in particular to an unattended intelligent well head safety control system and a control method thereof.
Background
At present, with the increasing importance on environmental protection in recent years, natural gas is used as clean energy and is widely applied, the exploitation quantity of natural gas wells is greatly increased, and the increase of workload leads to higher requirements on intelligent unmanned production systems.
The traditional wellhead safety control system adopts a low-pressure pilot-controlled high-pressure mechanical valve to indirectly control the switch of the underground safety valve and the ground safety valve, can only be turned off remotely, and needs to be operated and opened on site when the switch of the underground safety valve and the ground safety valve is required to be opened. In actual conditions, if the well cannot be opened in time, normal production of the oil and gas well is affected, and the production yield is reduced, which is accompanied with certain economic loss.
With respect to the related art described above, the inventors consider that there is a drawback that unattended operation cannot be achieved.
Disclosure of Invention
In order to realize remote control conveniently, the application provides unmanned on duty intelligent well head safety control system and control method thereof.
First aspect, this application provides unmanned on duty intelligence well head safety control system adopts following technical scheme:
the unattended intelligent wellhead safety control system comprises an underground safety valve, a ground safety valve and a hydraulic power module, wherein the hydraulic power module is used for providing working pressure for a working circuit where the underground safety valve and the ground safety valve are located and enabling the underground safety valve and the ground safety valve to be opened, the hydraulic power module is coupled with a pressure detection module, the pressure detection module is used for detecting the magnitude of the working pressure and outputting a working pressure signal, the pressure detection module is coupled with a control module, a working pressure reference value is preset in the control module and used for comparing the magnitude of the working pressure signal value with the magnitude of the working pressure reference value to output a control signal to the hydraulic power module, the hydraulic power module outputs the working pressure required by the underground safety valve and the ground safety valve after receiving the control signal, and the control module comprises a DCS controller, the DCS controller is in communication connection with a central control module, and the central control module is used for remotely controlling the opening and closing of the ground safety valve and the opening and closing of the underground safety valve and the ground safety valve.
Through adopting above-mentioned technical scheme, through mutually supporting of hydraulic power module, pressure detection module and control module, can conveniently control hydraulic power module and provide operating pressure. The central control module is convenient for the remote control of the start of the DCS controller, and is indirectly convenient for the control of the opening and closing of the underground safety valve and the ground safety valve through the DCS controller. Through the mode, unattended operation can be achieved, the underground safety valve and the ground safety valve can be conveniently controlled to be opened and closed, and meanwhile, the efficiency of opening the underground safety valve and the ground safety valve is effectively saved.
Preferably, the control module is coupled with an opening and closing module, the opening and closing module includes a downhole safety valve control loop and a surface safety valve control loop, the downhole safety valve control loop is coupled with the control module and controlled by the control module to control the opening and closing of the downhole safety valve, and the surface safety valve control loop is coupled with the control module and controlled by the control module to control the opening and closing of the surface safety valve.
Through adopting above-mentioned technical scheme, can be according to actual need, through the work of central control module remote control hydraulic pressure electric module, be convenient for indirectly open downhole safety valve and ground relief valve. Among the contrast prior art, need the staff to go the scene before, open the mode of relief valve and ground relief valve in the pit again, this mode is convenient for the staff long-range opening, has effectively saved work efficiency, simultaneously, has avoided because of can not in time open the economic loss that relief valve and ground relief valve brought in the pit.
Preferably, the downhole safety valve control circuit comprises a backflow prevention part, a pressure balance part and a downhole high-pressure electromagnetic valve, the backflow prevention part is communicated with a hydraulic circuit in the hydraulic power module and used for enabling the hydraulic power module to provide working pressure for the downhole safety valve, the pressure balance part is communicated with the backflow prevention part and used for balancing the working pressure to be provided so that the hydraulic power module can stably provide the working pressure for the downhole safety valve, the downhole high-pressure electromagnetic valve is connected with the pressure balance part, and the downhole high-pressure electromagnetic valve is coupled with the control module and controlled by the control module so that the downhole safety valve is opened.
Through adopting above-mentioned technical scheme, the existence of anti-return spare, the hydraulic power module of being convenient for lasts to pressurize for relief valve place return circuit in the pit, promptly, makes things convenient for the hydraulic power module to provide operating pressure for the relief valve in the pit, and can avoid the pressure reflux in the pit to cause unusual shutoff in the pit. The existence of the pressure balancing piece can stabilize the working pressure to be provided, so that the fluctuation of the working pressure is maintained in a required range, and the stable and continuous pressurization of the working pressure can be realized. The underground high-pressure electromagnetic valve is controlled by the control module to switch the working state, so that the underground safety valve can be opened conveniently after being pressurized. Through mutually supporting of backflow prevention spare, pressure balance spare and high pressure solenoid valve in the pit, just can be effective, stable provide operating pressure to relief valve in the pit.
Preferably, the ground safety valve control circuit comprises a pressure regulating part, a supply pressure gauge, a pressure stabilizing part and a ground high-pressure electromagnetic valve, wherein the pressure regulating part is communicated with the hydraulic circuit in the hydraulic power module and used for regulating the magnitude of the working pressure to be provided, the supply pressure gauge is connected with the pressure regulating part and used for displaying the numerical value of the working pressure to be provided, the pressure stabilizing part is connected with the supply pressure gauge and used for stabilizing the working pressure to be provided, the ground high-pressure electromagnetic valve is connected with the pressure stabilizing part, and the high-pressure electromagnetic valve is coupled with the control module and controlled by the control module so as to open the ground safety valve.
Through adopting above-mentioned technical scheme, the existence of pressure regulating spare can be according to actual need carries out the pressure regulating to the operating pressure in the return circuit, to this, can in time adjust the operating pressure in the return circuit, and then makes operating pressure be in suitable within range value. The existence of the supply pressure gauge can detect the working pressure in real time, so that the working personnel can know the pressure change of the working pressure in time, and then follow-up relevant measures can be taken conveniently. The pressure stabilizing part is convenient for balance working pressure so as to enable the working pressure to be in a proper range, and accordingly, the risk of working pressure abnormity can be effectively reduced. After the ground high-voltage solenoid valve receives the opening signal, just can direct control ground relief valve open, this drive mode is comparatively simple, also is convenient for high-efficiently open ground relief valve.
Preferably, the ground safety valve is coupled with a pressure display part for displaying the pressure state of a control loop in which the ground safety valve is located, the pressure display part comprises a ground pressure gauge and a ground pressure transmitter, the ground pressure gauge is coupled with the ground safety valve and used for displaying the working pressure of the loop in which the ground safety valve is located, and the ground pressure transmitter is coupled with the control module and used for transmitting the detected working pressure information for displaying the loop in which the ground safety valve is located into the control module.
Through adopting above-mentioned technical scheme, ground pressure gauge's inside organizational structure is simple, no matter be the installation or use all very convenience, is applicable to the installation of various pipelines, to this, the staff's of being convenient for installation. The pressure transmitter has the performance advantages of wide application range, high working stability, light weight, small occupied space, good wear resistance, high measurement precision, convenience in maintenance and the like. The ground pressure transmitter is coupled with the control module, so that the working pressure information can be conveniently transmitted to the control module, and the control module can conveniently monitor the fluctuation condition of the working pressure in time, thereby facilitating the staff to take corresponding measures.
Preferably, the ground high-pressure solenoid valve is connected with a ground overflow valve coupled with the control module, and the ground overflow valve is used for automatically discharging overlarge working pressure.
Through adopting above-mentioned technical scheme, the existence of ground overflow valve can in time let out too much operating pressure when operating pressure is too big, to this, just can export suitable operating pressure and make the ground relief valve opened.
The second aspect, this application provides unmanned on duty intelligence well head safety control method, adopts following technical scheme:
the unattended intelligent wellhead safety control method comprises the following steps:
acquiring a working pressure signal to be provided;
presetting a working pressure reference value and judging the size of the obtained working pressure signal value and the preset working pressure reference value;
when the working pressure signal value is lower than the working pressure reference value, a control signal is output to the hydraulic power module so as to pressurize the hydraulic power module to the working pressure required by the ground safety valve and the underground safety valve;
when the working pressure signal value is within the range of the preset working pressure reference value, a control signal is output to the hydraulic power module, so that the hydraulic power module does not work.
Through adopting above-mentioned technical scheme, to the size of working pressure value, can take corresponding measure to indirectly make the suitable big or small working pressure of output that hydraulic power module can be stable, and then be convenient for subsurface safety valve and ground relief valve are by the pressurization, in order indirectly to be opened.
To sum up, the application comprises the following beneficial technical effects of at least an unattended intelligent wellhead safety control system and a control method thereof:
1. through the mutual cooperation of the hydraulic power module, the pressure detection module, the control module, the underground safety valve control loop and the ground safety valve control loop, the underground safety valve and the ground safety valve can be opened in time according to actual needs. Compared with the traditional pilot type indirect control mechanical valve, the remote automatic control can be realized, and manual opening in the field is not needed. The switch control can be completed in the central control room, and unmanned operation of the well site is realized. At the same time. The automatic control level of the natural gas well site is improved, and the well site data monitoring and remote control are perfected;
2. the control module can adopt a DCS controller, aiming at the problem, data of all equipment in the well site can be collected in a centralized mode, linkage control among the equipment is achieved, and unmanned intelligent control of the well site is achieved. The centralized control mode greatly improves the reliability of well site control and reduces the occurrence of accidents;
3. the backflow prevention piece is convenient for the hydraulic power module to continuously pressurize a loop where the underground safety valve is located, namely the hydraulic power module is convenient for providing working pressure for the underground safety valve, and underground abnormal shutoff caused by underground pressure backflow can be avoided;
4. the pressure balancing piece can stabilize the working pressure to be provided, so that the fluctuation of the working pressure is maintained in a required range, and the working pressure can be stably and continuously pressurized;
5. the existence of pressure regulating spare can be according to actual need carries out the pressure regulating to the operating pressure in the return circuit, to this, can in time adjust the operating pressure in the return circuit, and then makes operating pressure be in suitable range value.
Drawings
FIG. 1 is a flow control diagram of a central control module and a control module in an embodiment of the present application;
FIG. 2 is a control schematic diagram of an unattended intelligent wellhead safety control system in an embodiment of the application;
FIG. 3 is a control schematic of the hydraulic power module and control module in an embodiment of the present application;
FIG. 4 is a control schematic diagram of the open/close module and the control module in the embodiment of the present application;
FIG. 5 is a control schematic of a downhole safety valve control loop and control module in an embodiment of the present application;
FIG. 6 is a control schematic of a ground safety valve control loop and control module in an embodiment of the present application;
fig. 7 is a schematic step diagram of an unattended intelligent wellhead safety control method in the embodiment of the application.
Reference numerals: 11. a downhole safety valve; 12. a ground safety valve; 2. a hydraulic power module; 21. an oil tank; 22. an electric pump; 23. an overpressure relief valve; 24. a one-way valve; 25. a manual pump; 26. a hydraulic pressure gauge; 3. a pressure detection module; 4. a control module; 5. an opening and closing module; 6. a downhole safety valve control loop; 61. a backflow prevention member; 62. a pressure balance member; 63. a downhole high pressure solenoid valve; 64. an underground pressure gauge; 65. a downhole pressure transmitter; 66. an underground overflow valve; 7. a ground safety valve control loop; 71. adjusting a pressing piece; 72. a supply pressure gauge; 73. a pressure stabilizer; 74. a ground high-pressure electromagnetic valve; 75. a pressure display member; 751. a ground pressure gauge; 752. a ground pressure transmitter; 76. a ground overflow valve; 8. and a central control module.
Detailed Description
The present application is described in further detail below with reference to figures 1-7.
The embodiment of the application discloses unmanned on duty intelligence well head safety control system for remote control 11 and the opening and close of ground relief valve 12 in the pit, and then make things convenient for the natural gas pipeline production of ventilating, more importantly, can realize natural gas well unmanned on duty, but remote control ventilation production.
Referring to fig. 1, the unattended intelligent wellhead safety control system comprises an underground safety valve 11, a ground safety valve 12, a hydraulic power module 2, a control module 4, an opening and closing module 5 and a central control module 8. The underground safety valve 11 and the ground safety valve 12 are both communicated in a natural gas pipeline, and when the underground safety valve and the ground safety valve are opened, the natural gas pipeline can normally ventilate and produce. The hydraulic power module 2 provides power for the downhole safety valve 11 and the surface safety valve 121, so that the downhole safety valve 11 and the surface safety valve 121 are opened after being pressurized. The control module 4 is coupled with the hydraulic power module 2, and the hydraulic power module 2 can be started by the control module 4 under the electric control or manual control. When the hydraulic power module 2 provides preset working pressure for the downhole safety valve 11 and the ground safety valve 121, the control module 4 outputs a control signal to the hydraulic power module 2, and after the hydraulic power module 2 receives the control signal, the hydraulic power module 2 does not work, and at the moment, whether the downhole safety valve 11 and the ground safety valve 12 are opened or closed through the control module 4 can be selected according to actual needs.
Referring to fig. 1, the central control module 8 is a central control room, the central control room is in communication connection with the control module 4 in a wired or wireless communication mode, and in practical situations, a worker can control the control module 4 to control the opening of the downhole safety valve 11 and the surface safety valve 121 through the central control room. In addition, equipment such as a heating furnace, a metering pry and a separator for monitoring data related to a well site are coupled to the control module 4, and actually, the control module 4 can collect data of all the equipment in the well site in a centralized manner and realize linkage control among the equipment in cooperation with the central control module 8. When the control module 4 collects data monitored by equipment such as the heating furnace, the metering pry and the separator, the related data are transmitted to the central control room through the communication module, and after the central control room receives the data, a feedback signal can be output to the control module 4 by a worker in the central control room so as to indirectly control the equipment such as the heating furnace, the metering pry and the separator to perform related work such as data collection through the control module 4. The centralized control mode greatly improves the reliability of well site control and reduces the occurrence of accidents at the same time.
Referring to fig. 2, the hydraulic power module 2 includes an oil tank 21, an electric pump 22, an overpressure relief valve 23 and a check valve 24, in this embodiment, referring to fig. 3, the medium hydraulic oil is stored in the oil tank 21, the electric pump 22 is mounted on the oil tank 21 and is used for pressurizing the medium hydraulic oil in the oil tank 21 to a required working pressure, the overpressure relief valve 23 is communicated with the oil tank 21 through an oil pipe, the overpressure relief valve 23 is used for flowing out excess medium hydraulic oil when the hydraulic pressure is too large, and in actual situations, the flowed out medium hydraulic oil can be discharged back to the oil tank 21 again. A check valve 24 is also mounted on the oil pipe, and the check valve 24 is used for matching the one-way flow of the high-pressure hydraulic oil, namely, facilitating the flow of the high-pressure hydraulic oil to the opening and closing module 5. In other embodiments, the electric pump 22 may be replaced with a manual pump 25.
Referring to fig. 3, in order to show the magnitude of the working pressure provided by the high-pressure hydraulic oil, a hydraulic pressure gauge 26 is installed on the oil pipe near the check valve 24. In order to measure the magnitude of the working pressure accurately, the check valve 24 is further provided with a pressure detection module 3, in this embodiment, the pressure detection module 3 is a pressure transmitter, the pressure transmitter is coupled to the control module 4, the pressure detection module 3 is configured to detect the magnitude of the working pressure and output a working pressure signal to the control module 4, and the control module 4 outputs a control signal to the electric pump 22 after receiving the working pressure signal.
Referring to fig. 3, the control module 4 is a DCS controller, and in order to enable the provided working pressure signal value to always satisfy a preset working pressure value, a comparison module is arranged in the DCS controller, the comparison module is preset with a working pressure reference value, and when the obtained working pressure signal value is lower than the working pressure reference value, the control module 4 outputs a control signal to the electric pump 22, so that the electric pump 22 pressurizes the medium hydraulic oil; when the obtained working pressure signal value is higher than the working pressure reference value, the overpressure overflow valve 23 is automatically opened to discharge excessive medium hydraulic oil. In this way, the purpose of pressure relief can be achieved, when the working pressure value to be obtained again is within the preset working pressure range value, the check valve 24 is automatically closed, and meanwhile, the control module 4 outputs a pause control signal to stop the operation of the electric pump 22.
Referring to fig. 4, the open/close module 5 includes a downhole safety valve control circuit 6 and a surface safety valve control circuit 7, the downhole safety valve control circuit 6 is coupled to the control module 4 and controlled by the control module 4 to control the open/close of the downhole safety valve 11, and the surface safety valve control circuit 7 is coupled to the control module 4 and controlled by the control module 4 to control the open/close of the surface safety valve 12.
Referring to fig. 5, the downhole safety valve control circuit 6 includes a backflow prevention member 61, a pressure balancing member 62, a downhole high pressure solenoid valve 63, a downhole overflow valve 66, a downhole pressure gauge 64, and a downhole pressure transmitter 65. The backflow prevention part 61 is the downhole one-way valve 24, the backflow prevention part 61 is communicated with a hydraulic circuit in the hydraulic power module 2 through an oil pipe, and the existence of the backflow prevention part 61 can enable the hydraulic power module 2 to continuously and stably pressurize the downhole safety valve 11. The pressure balancing member 62 is commonly connected to the backflow prevention member 61 for balancing the working pressure to be supplied, and the pressure balancing member 62 is a downhole accumulator. The underground high-pressure electromagnetic valve 63 is connected with the pressure balancing part 62, the underground high-pressure electromagnetic valve 63 is coupled with the control module 4, when the underground high-pressure electromagnetic valve 63 receives an opening signal of the control module 4, the underground safety valve 11 is opened, at the moment, the underground safety valve 11 is fully opened after being pressurized by working pressure, and the natural gas pipeline is ventilated for production again.
The underground overflow valve 66 is connected with the underground high-pressure electromagnetic valve 63 and used for discharging overlarge working pressure, the underground pressure gauge 64 is connected with the underground overflow valve 66 and used for displaying the working pressure of a loop where the underground safety valve 11 is located, the underground pressure transmitter 65 is connected with the underground high-pressure electromagnetic valve 63 and used for accurately detecting the working pressure of the loop where the underground safety valve 11 is located and outputting an underground working pressure signal to the control module 4, and the control module 4 can control the opening and closing of the underground safety valve 11 according to the value of the underground working pressure signal.
Referring to fig. 6, the ground safety valve control circuit 7 includes a pressure regulating member 71, a supply pressure gauge 72, a pressure stabilizing member 73, a ground high pressure solenoid valve 74, a ground relief valve 76, and a pressure display member 75. The pressure regulating member 71 is a pressure regulating valve, which is communicated with the hydraulic circuit in the hydraulic power module 2 and is used for regulating the working pressure in the ground safety valve control circuit 7, so that the working pressure to be provided can meet the pressure required by the ground safety valve 12. The supply pressure gauge 72 is connected to the pressure regulator 71 for displaying the value of the working pressure to be provided. The pressure stabilizing member 73 is a ground accumulator, the ground accumulator is connected with the supply pressure gauge 72 through an oil pipe, the ground accumulator is used for stabilizing the working pressure to be provided, the ground high-pressure electromagnetic valve 74 is connected with the pressure stabilizing member 73, the ground high-pressure electromagnetic valve 74 is coupled with the control module 4, and is controlled by the control module 4 to enable the ground safety valve 12 to be opened, so that the ground safety valve 12 is completely opened after being pressurized.
Referring to fig. 6, the surface relief valve 76 is connected to the pressure stabilizer 73 through a pipe, and when the pressure in the surface relief valve control circuit 7 is excessive, the surface relief valve 76 opens by itself to relieve the excessive pressure. The pressure display unit 75 is coupled to the control module 4 and configured to display a pressure state of a control loop in which the surface safety valve 12 is located, the pressure display unit 75 includes a surface pressure gauge 751 and a surface pressure transmitter 752, the surface pressure gauge 751 is coupled to the surface safety valve 12 and configured to display a working pressure of the control loop in which the surface safety valve 12 is located, and the surface pressure transmitter 752 is coupled to the control module 4 and configured to transmit accurately detected information indicating the working pressure of the control loop in which the surface safety valve 12 is located to the control module 4, so that the control module 4 can conveniently control the opening and closing of the surface safety valve 12.
The implementation principle of the unattended intelligent wellhead safety control system is as follows: when the pressure detection module 3 detects that the working pressure is lower than the preset working pressure reference value, the working pressure signal is output to the control module 4, the control module 4 outputs a control signal to the electric pump 22 after receiving the control signal, and the electric pump 22 boosts the medium hydraulic oil to the working pressure required by the underground safety valve 11 and the ground safety valve 12 after receiving the control signal.
When the working pressure reaches the preset working pressure reference value, the control module 4 outputs a closing control signal to the electric pump 22 so that the electric pump 22 does not work, and at the moment, the working pressure in the loop meets the opening conditions of the ground safety valve 12 and the downhole safety valve 11.
When the surface safety valve 12 and the downhole safety valve 11 need to be opened, the control module 4 controls the downhole high-pressure solenoid valve 63 and the surface high-pressure solenoid valve 74 to be opened, so that the downhole safety valve 11 and the surface safety valve 12 are opened through pressurization, and at the moment, the natural gas pipeline can be ventilated for production. In practical applications, the control module 4 can open and close the downhole high-pressure solenoid valve 63 and the surface high-pressure solenoid valve 74 according to the pressure detected by the surface pressure transmitter 752 and the downhole pressure transmitter 65.
The embodiment of the application also discloses an unattended intelligent wellhead safety control method. Referring to fig. 7, the unattended intelligent wellhead safety control method includes:
acquiring a working pressure signal to be provided;
presetting a working pressure reference value and judging the size of the obtained working pressure signal value and the preset working pressure reference value;
when the working pressure signal value is lower than the working pressure reference value, a control signal is output to the hydraulic power module so as to pressurize the hydraulic power module to the working pressure required by the ground safety valve and the underground safety valve;
when the working pressure signal value is within the range of the preset working pressure reference value, a control signal is output to the hydraulic power module, so that the hydraulic power module does not work.
In addition, when the electric pump is slowly closed and the working pressure is too high, the overpressure overflow valve is automatically opened to discharge excessive medium hydraulic oil, and the overpressure overflow valve is automatically closed until the working pressure value is normal after the excessive medium hydraulic oil is discharged.
The implementation principle of the unattended intelligent wellhead safety control method in the embodiment of the application is as follows: when the working pressure signal value provided by the hydraulic power module is lower than the working pressure reference value, the control module outputs a starting control signal to the electric pump, so that the electric pump pressurizes the medium hydraulic oil, and indirectly provides conditions for opening the underground safety valve and the ground safety valve for the working pressure provided after pressurization;
when the working pressure signal value provided by the hydraulic power module is within the preset working pressure reference value range, a suspended control signal is output to the electric pump, so that the hydraulic power module does not work.
By the method, corresponding measures can be taken according to working pressures of different sizes, and the opening and closing stability of the underground safety valve and the ground safety valve is improved.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. Unmanned on duty intelligence well head safety control system, including subsurface safety valve (11) and ground relief valve (12), its characterized in that: the underground safety valve control system further comprises a hydraulic power module (2), the hydraulic power module (2) is a working loop where the underground safety valve (11) and the ground safety valve (12) are located and provides working pressure to enable the underground safety valve (11) and the ground safety valve (12) to be opened, the hydraulic power module (2) is coupled with a pressure detection module (3), the pressure detection module (3) is used for detecting the magnitude of the working pressure and outputting a working pressure signal, the pressure detection module (3) is coupled with a control module (4), the control module (4) is preset with a working pressure reference value and used for comparing the magnitude of the working pressure signal value with the working pressure reference value to output a control signal to the hydraulic power module (2), and the hydraulic power module (2) outputs the working pressure required by the underground safety valve (11) and the ground safety valve (12) after receiving the control signal, the control module (4) comprises a DCS controller, the DCS controller is in communication connection with a central control module (8), and the central control module (8) is used for remotely controlling the opening and closing of the ground safety valve (12) and the underground safety valve (11).
2. The unattended intelligent wellhead safety control system according to claim 1, wherein: an opening and closing module (5) is coupled to the control module (4), the opening and closing module (5) comprises an underground safety valve control loop (6) and a ground safety valve control loop (7), the underground safety valve control loop (6) is coupled to the control module (4) and controlled by the control module (4) to control opening and closing of an underground safety valve (11), and the ground safety valve control loop (7) is coupled to the control module (4) and controlled by the control module (4) to control opening and closing of a ground safety valve (12).
3. The unattended intelligent wellhead safety control system according to claim 1, wherein: the underground safety valve control circuit (6) comprises a backflow prevention part (61), a pressure balancing part (62) and an underground high-pressure electromagnetic valve (63), wherein the backflow prevention part (61) is communicated with a hydraulic circuit in the hydraulic power module (2) and used for enabling the hydraulic power module (2) to provide working pressure for the underground safety valve (11), the pressure balancing part (62) is communicated with the backflow prevention part (61) and used for balancing the working pressure to be provided so that the hydraulic power module (2) can stably provide the working pressure for the underground safety valve (11), the underground high-pressure electromagnetic valve (63) is connected with the pressure balancing part (62), and the underground high-pressure electromagnetic valve (63) is coupled with the control module (4) and controlled by the control module (4) so that the underground safety valve (11) is opened.
4. The unattended smart wellhead safety control system according to claim 1, the ground safety valve control loop (7) comprises a pressure regulating part (71), a supply pressure gauge (72), a pressure stabilizing part (73) and a ground high-pressure electromagnetic valve (74), the pressure regulating part (71) is communicated with a hydraulic circuit in the hydraulic power module (2) and is used for regulating the size of the working pressure to be provided, the supply pressure gauge (72) is connected with the pressure regulating part (71) and is used for displaying the working pressure value to be provided, the pressure stabilizing element (73) is connected to the supply pressure gauge (72) for stabilizing the working pressure to be provided, the ground high-pressure electromagnetic valve (74) is connected with a pressure stabilizing member (73), and the high-pressure electromagnetic valve is coupled with the control module (4) and controlled by the control module (4) to enable the ground safety valve (12) to be opened.
5. The unattended intelligent wellhead safety control system according to claim 3, wherein the surface safety valve (12) is coupled with a pressure display (75) for displaying the pressure state of the control loop of the surface safety valve (12), the pressure display (75) comprises a surface pressure gauge (751) and a surface pressure transmitter (752), the surface pressure gauge (751) is coupled with the surface safety valve (12) for displaying the working pressure of the loop of the surface safety valve (12), and the surface pressure transmitter (752) is coupled with the control module (4) for transmitting the detected working pressure information of the loop of the surface safety valve (12) to the control module (4).
6. The unattended intelligent wellhead safety control system according to claim 4, wherein the surface high pressure solenoid valve (74) is connected with a surface overflow valve (76) coupled with the control module (4), and the surface overflow valve (76) is used for automatically discharging the excessive working pressure.
7. A control method applied to the unattended intelligent wellhead safety control system according to claims 1-6, and characterized by comprising the following steps:
acquiring a working pressure signal to be provided;
presetting a working pressure reference value and judging the size of the obtained working pressure signal value and the preset working pressure reference value;
when the working pressure signal value is lower than the working pressure reference value, a control signal is output to the hydraulic power module so as to pressurize the hydraulic power module to the working pressure required by the ground safety valve and the underground safety valve;
when the working pressure signal value is within the range of the preset working pressure reference value, a control signal is output to the hydraulic power module, so that the hydraulic power module does not work.
8. A computer-readable storage medium having stored thereon a computer program that can be loaded by a processor and that executes the unattended smart wellhead safety control method according to claim 7.
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| US6412510B1 (en) * | 1998-11-17 | 2002-07-02 | Barber Industries, Inc. | Wellhead safety valve control system |
| CN101709630A (en) * | 2009-11-30 | 2010-05-19 | 泸州川油钻采工具有限公司 | Integrated control module for safe shutdown system of wellhead |
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