Wellhead safety monitoring control system

Abstract

The invention relates to the technical field of testing, in particular to a wellhead safety monitoring control system, which comprises a dynamic execution connecting pipeline, the dynamic execution connecting pipeline comprises a station power pipeline and a station sensing pipeline, the station power pipeline is in signal connection with a control cabinet, and the station sensing pipeline is provided with a hydraulic cut-off valve group; when the fusible plug is melted due to abnormal wellhead temperature, the RTU control panel preferentially sends a cut-off signal to the electromagnetic pressure release valve, and after a pressure supplementing channel formed by the electric booster pump set and the inner side of the oil cavity of the driving oil cylinder is cut off through the electromagnetic pressure release valve, the electric booster pump set is controlled to relieve pressure supplementing, and an unlocking signal is synchronously released to the safety lock. The spring driving device is unlocked through the safety lock, so that the output end of the driving oil cylinder switches the ground safety valve and the wellhead safety valve in the station power pipeline into a closed state in sequence, and the situation that oil pressure is directly and continuously supplemented after specific information is not obtained after pressure relief due to rising of the wellhead temperature is avoided.

Description

Technical Field

[0001] The invention relates to the field of testing technology, in particular to a wellhead safety monitoring and control system. Background Art

[0002] A wellhead safety monitoring and control system is a control system that protects the safety of natural gas wells and production equipment. When the process parameters of the gas well and production system are abnormal or the environmental conditions are abnormal, which endanger the safety of the natural gas well and production equipment, the natural gas well is automatically closed to ensure the safety of the natural gas well and production equipment. A traditional wellhead safety monitoring and control system mainly consists of a wellhead shut-off valve, a wellhead control panel, a gas supply pipeline, a fire fusible plug and a hydraulic pipeline. Its main operation mode is that the fire fusible plug triggers the opening and closing of the wellhead shut-off valve after the wellhead temperature rises, or controls the opening and closing of the shut-off valve by monitoring the working pressure of the protected equipment when it is higher than the upper limit setting value or lower than the lower limit setting value. The problem with this control system is that since the two trigger ports are independent trigger ports, when the data collected at both ends cannot be synchronously summarized and processed, each end repeatedly executes the opening and closing commands corresponding to the acquired data, which is easy to cause errors. That is, when the wellhead temperature is overheated and the fusible plug automatically melts to release the oil pressure of the driving cylinder, the pressure before the monitoring valve of the protected equipment is too low to make up the pressure, which will directly cause a control process conflict, resulting in limited control accuracy of the shut-off valve. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a wellhead safety monitoring and control system.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a wellhead safety monitoring and control system, including a dynamic execution connection pipeline, the dynamic execution connection pipeline includes a station power pipeline and a station sensing pipeline, the station power pipeline signal is connected to a control cabinet, the station sensing pipeline is installed with a hydraulic shut-off valve group, the control cabinet is signal-connected to the hydraulic shut-off valve group, the control cabinet is used to sense the pressure signal transmitted by the station sensing pipeline, so as to control the hydraulic shut-off valve group to automatically close the input end of the station sensing pipeline;

[0005] The control cabinet is integrated with an RTU control panel, a multi-terminal pressure monitoring component, a terminal junction box, an electric booster pump group, an instrument pipeline, an accumulator group, a pressure transmitter, a hydraulic oil tank and an electromagnetic pressure relief valve. The multi-terminal pressure monitoring component is connected to the station sensing pipeline signal through the instrument pipeline, the accumulator group is installed on the inner side of the hydraulic oil tank, the pressure transmitter is connected to the ground safety valve output circuit in the station power pipeline, the input end of the electric booster pump group is connected to the hydraulic oil tank, the electromagnetic pressure relief valve is installed at the head of the output end of the electric booster pump group, and the electromagnetic pressure relief valve is connected to the multi-terminal pressure monitoring component signal;

[0006] The hydraulic shut-off valve group includes a flange parallel gate valve, a driving cylinder, a spring driving device, a safety lock and a fusible plug. The flange parallel gate valve is installed on the inner side of the station power pipeline, and the flange parallel gate valve is communicated with the station power pipeline. The driving cylinder, the safety lock and the fusible plug are all installed on the flange parallel gate valve. The tail of the output end of the electric booster pump group is fixedly connected to the oil chamber input end of the driving cylinder. The driving cylinder is installed corresponding to the position of the ground safety valve and the wellhead safety valve in the station power pipeline. The output end of the driving cylinder is fixedly connected to the ground safety valve and the wellhead safety valve in the station power pipeline respectively. The spring driving device is arranged at the output end of the driving cylinder. The safety lock is used for contraction locking of the spring driving device in a non-driving state. The safety lock is connected to the driving cylinder signal.

[0007] Preferably, the RTU control panel is connected to the driving cylinder and the safety lock signal, and the RTU control panel sends an unlocking signal to the driving cylinder according to the pressure signal collected by the multi-terminal pressure monitoring component, thereby controlling the unlocking of the safety lock through the driving cylinder.

[0008] Preferably, the fusible plug is used to vent the oil chamber of the driving cylinder after the wellhead temperature rises to its melting temperature, so that the safety lock unlocks the spring driving device, and the energy released by the unlocked spring driving device drives the output end of the driving cylinder to switch the ground safety valve and the wellhead safety valve in the station power pipeline to the closed state in turn.

[0009] Preferably, the accumulator group is used to compensate for oil pressure leakage in the driving cylinder, and the electromagnetic pressure relief valve is used to open the oil drain port to discharge the oil pressure between the driving cylinder and the electric booster pump group.

[0010] Preferably, the multi-terminal pressure monitoring component is fixedly connected to the inner side of the RTU control panel, and the multi-terminal pressure monitoring component is connected to the power supply through the terminal junction box.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By setting the control cabinet to synchronously connect the hydraulic shut-off valve group and the station power pipeline, synchronous processing after abnormal data acquisition is realized. When the wellhead temperature is normal, the safety lock locks the spring drive device, and the ground safety valve and the wellhead safety valve in the station power pipeline remain open. At the same time, the control cabinet remains in operation. When the multi-terminal pressure monitoring component collects the abnormal gas supply pressure signal of the station sensing pipeline, the RTU control panel can directly send a safety lock unlocking signal to the drive cylinder, and the safety lock unlocks the spring drive device to release energy, thereby driving the cylinder output end to switch the ground safety valve and the wellhead safety valve in the station power pipeline to closed in turn. When the wellhead temperature is abnormal and causes the fusible plug to melt, the RTU control panel will preferentially send a cutoff signal to the electromagnetic pressure relief valve. After the electromagnetic pressure relief valve cuts off the pressure replenishment channel formed by the electric booster pump group and the inner side of the oil chamber of the driving cylinder, the electric booster pump group is controlled to release the pressure replenishment, and the unlocking signal is simultaneously released to the safety lock. The spring drive device is unlocked through the safety lock, so that the output end of the driving cylinder switches the ground safety valve and the wellhead safety valve in the power pipeline of the station to the closed state in turn, avoiding the continuous replenishment of oil pressure without obtaining specific information after the pressure relief due to the increase of wellhead temperature, thereby ensuring the stability of the ground safety valve and the wellhead safety valve when they are closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a composition diagram of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the control cabinet in the present invention;

[0016] Figure 3 It is a schematic diagram of the structure of the control cabinet and the hydraulic shut-off valve group in the present invention.

[0017] In the figure: 1. Dynamic execution connecting pipeline; 11. Station power pipeline; 12. Station sensing pipeline; 2. Control cabinet; 21. RTU control panel; 22. Multi-terminal pressure monitoring component; 23. Terminal junction box; 24. Electric booster pump group; 25. Instrument pipeline; 26. Accumulator group; 27. Pressure transmitter; 28. Hydraulic oil tank; 29. ​​Solenoid pressure relief valve; 3. Hydraulic shut-off valve group; 31. Flange parallel gate valve; 32. Driving cylinder; 33. Spring drive device; 34. Safety lock; 35. Fusible plug. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0019] like Figure 1-Figure 3As shown, a wellhead safety monitoring and control system described in the present invention includes a dynamic execution connecting pipeline 1, which includes a station power pipeline 11 and a station sensing pipeline 12. The station power pipeline 11 is signal-connected with a control cabinet 2, and the station sensing pipeline 12 is installed with a hydraulic shut-off valve group 3. The control cabinet 2 is signal-connected with the hydraulic shut-off valve group 3. The control cabinet 2 is used to sense the pressure signal transmitted by the station sensing pipeline 12, thereby controlling the hydraulic shut-off valve group 3 to automatically close the input end of the station sensing pipeline 12.

[0020] In this embodiment, in order to solve the problem that the existing wellhead shut-off valve opening and closing conversion method is prone to errors in that each end repeatedly executes the opening and closing commands corresponding to the acquired data when the data collected at both ends cannot be synchronously aggregated and processed due to the setting of two independent trigger ends, the present invention proposes a wellhead safety monitoring and control system, which realizes synchronous processing after abnormal data acquisition by setting a control cabinet 2 to synchronously connect the hydraulic shut-off valve group 3 and the station power pipeline 11.

[0021] The control cabinet 2 is integrated with an RTU control panel 21, a multi-terminal pressure monitoring component 22, a terminal junction box 23, an electric booster pump group 24, an instrument pipeline 25, an accumulator group 26, a pressure transmitter 27, a hydraulic oil tank 28 and an electromagnetic pressure relief valve 29. The multi-terminal pressure monitoring component 22 is connected to the station sensing pipeline 12 signal through the instrument pipeline 25, the accumulator group 26 is installed on the inner side of the hydraulic oil tank 28, the pressure transmitter 27 is connected to the ground safety valve output circuit in the station power pipeline 11, the input end of the electric booster pump group 24 is connected to the hydraulic oil tank 28, the electromagnetic pressure relief valve 29 is installed at the head of the output end of the electric booster pump group 24, and the electromagnetic pressure relief valve 29 is connected to the multi-terminal pressure monitoring component 22 signal.

[0022] In this embodiment, the multi-terminal pressure monitoring component 22 is composed of at least eight groups of pressure gauges, and respectively corresponds to measuring the pressure after downhole pressurization, with a range of 0-23000PSI, the output control pressure of the downhole safety valve, with a range of 0-23000PSI, the power source pressure after the downhole dynamic pump, with a range of 0-10000PSI, the output control pressure of the ground safety valve, with a range of 0-10000PSI, the power source pressure after the ground pump, with a range of 0-10000PSI, the pressure after the downhole pressure regulating valve and before the booster pressurization, with a range of 0-6000PSI, the fusible plug circuit pressure, with a range of 0-400PSI and the supply pressure of the pilot control circuit, with a range of 0-400PSI. The multi-terminal pressure monitoring component 22 is used to detect each level of pressure to determine whether it exceeds the preset pressure value, wherein the eight groups of pressure gauges are installed corresponding to the pressure measurement position ends.

[0023] In this embodiment, when the oil pressure is added to the driving cylinder 32 in a conventional operation, the electromagnetic pressure relief valve 29 is in a conducting state, and the oil in the hydraulic oil tank 28 is input into the inner side of the driving cylinder 32 through the electric booster pump group 24, so that the driving cylinder 32 lifts the valves of the ground safety valve and the downhole safety valve, and keeps the valves open, and then is cut off by the electromagnetic pressure relief valve 29. At the same time, the electric booster pump group 24 is also provided with a hydraulic sensor for leakage compensation of the oil circuit of the driving cylinder 32. After the oil pressure in the oil chamber of the driving cylinder 32 drops, the electromagnetic pressure relief valve 29 is controlled to open through the RTU control panel 21, and the hydraulic oil is continuously added to the oil chamber of the driving cylinder 32 through the electric booster pump group 24.

[0024] The hydraulic shut-off valve group 3 includes a flange parallel gate valve 31, a driving cylinder 32, a spring driving device 33, a safety lock 34 and a fusible plug 35. The flange parallel gate valve 31 is installed on the inner side of the station power pipeline 11, and the flange parallel gate valve 31 is connected to the station power pipeline 11. The driving cylinder 32, the safety lock 34 and the fusible plug 35 are all installed on the flange parallel gate valve 31. The tail of the output end of the electric booster pump group 24 is fixedly connected to the oil chamber input end of the driving cylinder 32. The driving cylinder 32 is installed at the position of the ground safety valve and the wellhead safety valve in the station power pipeline 11. The output end of the driving cylinder 32 is fixedly connected to the ground safety valve and the wellhead safety valve in the station power pipeline 11 respectively. The spring driving device 33 is arranged at the output end of the driving cylinder 32. The safety lock 34 is used for contraction locking of the spring driving device 33 in the non-driving state. The safety lock 34 is connected to the driving cylinder 32 signal.

[0025] In this embodiment, the fusible plug 35 is installed at the connection between the flange parallel gate valve 31 and the electromagnetic pressure relief valve 29. The fusible plug 35 uses the melting effect of the low melting point alloy at a higher temperature to open the pressure relief channel between the driving cylinder 32 and the electromagnetic pressure relief valve 29, so that the gas is discharged from the hole originally filled with the fusible alloy to release the pressure. Among them, the input end of the electric booster pump group 24 is connected to the hydraulic oil tank 28 through a pipeline, the output end of the electric booster pump group 24 is connected to the input end of the electromagnetic pressure relief valve 29 through a pipeline, and the output end of the electromagnetic pressure relief valve 29 is connected to the oil chamber of the driving cylinder 32 through a pipeline.

[0026] In an optional implementation of this embodiment, the RTU control panel 21 is connected to the driving cylinder 32 and the safety lock 34 signal. The RTU control panel 21 sends an unlocking signal to the driving cylinder 32 according to the pressure signal collected by the multi-terminal pressure monitoring component 22, and then controls the safety lock 34 to be unlocked through the driving cylinder 32.

[0027] In this embodiment, when the wellhead temperature is normal, the safety lock 34 locks the spring drive device 33, and the ground safety valve and the wellhead safety valve in the station power pipeline 11 remain open. At the same time, the control cabinet 2 remains in operation. When the gas supply pressure signal of the station sensing pipeline 12 collected by the multi-terminal pressure monitoring component 22 is abnormal, the RTU control panel 21 can directly send an unlocking signal of the safety lock 34 to the driving cylinder 32, and the spring drive device 33 is unlocked by the safety lock 34 to release energy, thereby driving the output end of the cylinder 32 to switch the ground safety valve and the wellhead safety valve in the station power pipeline 11 to the closed state in turn.

[0028] In an optional implementation of the present embodiment, the fusible plug 35 is used to vent the oil chamber of the driving cylinder 32 after the wellhead temperature rises to its melting temperature, so that the safety lock 34 unlocks the spring driving device 33. The energy released by the unlocked spring driving device 33 drives the output end of the driving cylinder 32 to switch the ground safety valve and the wellhead safety valve in the station power pipeline 11 to the closed state in turn.

[0029] In the present embodiment, by setting the fusible plug 35, when the wellhead temperature rises and the abnormal wellhead temperature causes the fusible plug 35 to melt, the multi-terminal pressure monitoring component 22 preferentially sends a shutoff closing signal to the electromagnetic pressure relief valve 29. After the electromagnetic pressure relief valve 29 cuts off the pressure replenishing channel formed by the electric booster pump group 24 and the inner side of the oil chamber of the driving cylinder 32, the electric booster pump group 24 is controlled to release the pressure replenishment, and the unlocking signal is simultaneously released to the safety lock 34. The spring driving device 33 is unlocked by the safety lock 34, so that the output end of the driving cylinder 32 switches the ground safety valve and the wellhead safety valve in the station power pipeline 11 to the closed state in turn, so as to avoid the continuous replenishment of oil pressure without obtaining specific information after the pressure relief due to the increase of the wellhead temperature, thereby ensuring the stability of the ground safety valve and the wellhead safety valve when they are closed.

[0030] In an optional implementation manner of the present embodiment, the accumulator group 26 is used to store oil pressure leakage compensation in the driving cylinder 32, and the electromagnetic pressure relief valve 29 is used to open the oil drain port to discharge the oil pressure between the driving cylinder 32 and the electric booster pump group 24; the multi-terminal pressure monitoring component 22 is provided with at least one group of pressure monitors placed in the oil chamber of the driving cylinder 32 and connected to the multi-terminal pressure monitoring component 22 through the instrument pipeline 25 for data display. After the multi-terminal pressure monitoring component 22 reads that the current pressure drop in the oil chamber of the driving cylinder 32 is reduced, the RTU control panel 21 converts the electromagnetic pressure relief valve 29 to a conducting state, and stores energy through the accumulator group 26 to replenish the oil inside the hydraulic oil tank 28 into the oil chamber of the driving cylinder 32 through the electric booster pump group 24.

[0031] In an optional implementation of this embodiment, the multi-terminal pressure monitoring component 22 is fixedly connected to the inner side of the RTU control panel 21 , and the multi-terminal pressure monitoring component 22 is connected to the power supply through the terminal junction box 23 .

[0032] The working principle of the present invention is: when the wellhead temperature is normal, the RTU control panel 21 controls the safety lock 34 to lock the spring drive device 33. At this time, the ground safety valve and the wellhead safety valve in the station power pipeline 11 are kept open, and the multi-terminal pressure monitoring component 22 in the control cabinet 2 keeps monitoring the operation state. When the pipeline gas supply pressure signal is abnormal, the RTU control panel 21 can directly send a safety lock 34 unlocking signal to the driving cylinder 32, and control the electromagnetic pressure relief valve 29 and the hydraulic oil tank 28 to unidirectionally conduct to empty the lower part of the oil chamber of the driving cylinder 32 until the oil pressure of the driving cylinder 32 is emptied, and the electromagnetic pressure relief valve 29 is controlled to close. At this time, the spring drive device 33 is unlocked by the safety lock 34 to release energy, so that the output end of the driving cylinder 32 is driven by the potential energy of the spring drive device 33 to send the station power pipeline 11 The ground safety valve and the wellhead safety valve are switched to the closed state in turn, and when the abnormal wellhead temperature causes the fusible plug 35 to melt, the RTU control panel 21 preferentially sends a cutoff signal to the electromagnetic pressure relief valve 29, and after the electromagnetic pressure relief valve 29 cuts off the pressure compensation channel formed by the electric booster pump group 24 and the inner side of the oil chamber of the driving cylinder 32, the electric booster pump group 24 is controlled to release the pressure compensation, and then the electromagnetic pressure relief valve 29 and the hydraulic oil tank 28 are controlled to be unidirectional to empty the lower part of the oil chamber of the driving cylinder 32, until the oil pressure of the driving cylinder 32 is emptied, and the electromagnetic pressure relief valve 29 is controlled to be closed. After the closing is completed, an unlocking signal is released to the safety lock 34, and the spring drive device 33 is unlocked by the safety lock 34, so that the output end of the driving cylinder 32 switches the ground safety valve and the wellhead safety valve in the station power pipeline 11 to the closed state in turn.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wellhead safety monitoring and control system, comprising a dynamic execution connection pipeline (1), wherein the dynamic execution connection pipeline (1) comprises a station power pipeline (11) and a station sensing pipeline (12), characterized in that: The station power pipeline (11) is signal-connected to a control cabinet (2); the station sensing pipeline (12) is installed with a hydraulic shut-off valve group (3); the control cabinet (2) is signal-connected to the hydraulic shut-off valve group (3); the control cabinet (2) is used to sense the pressure signal transmitted by the station sensing pipeline (12), thereby controlling the hydraulic shut-off valve group (3) to automatically close the input end of the station sensing pipeline (12); The control cabinet (2) is integrated with an RTU control panel (21), a multi-terminal pressure monitoring assembly (22), a terminal junction box (23), an electric booster pump group (24), an instrument pipeline (25), an accumulator group (26), a pressure transmitter (27), a hydraulic oil tank (28) and an electromagnetic pressure relief valve (29); the multi-terminal pressure monitoring assembly (22) is connected to the station sensing pipeline (12) by signal through the instrument pipeline (25); the accumulator group (26) is installed on the inner side of the hydraulic oil tank (28); the pressure transmitter (27) is connected to the output circuit of the ground safety valve in the station power pipeline (11); the input end of the electric booster pump group (24) is connected to the hydraulic oil tank (28); the electromagnetic pressure relief valve (29) is installed at the head of the output end of the electric booster pump group (24); and the electromagnetic pressure relief valve (29) is connected to the multi-terminal pressure monitoring assembly (22) by signal.

2. A wellhead safety monitoring and control system according to claim 1, characterized in that: The hydraulic shutoff valve group (3) comprises a flange parallel gate valve (31), a driving oil cylinder (32), a spring driving device (33), a safety lock (34) and a fusible plug (35); the flange parallel gate valve (31) is installed on the inner side of the station power pipeline (11), and the flange parallel gate valve (31) is connected to the station power pipeline (11); the driving oil cylinder (32), the safety lock (34) and the fusible plug (35) are all installed on the flange parallel gate valve (31); the tail of the output end of the electric booster pump group (24) is connected to the driving oil cylinder (32); The oil chamber input end of the cylinder (32) is fixedly connected, the driving cylinder (32) is installed corresponding to the ground safety valve and the wellhead safety valve in the station power pipeline (11), the output end of the driving cylinder (32) is respectively fixedly connected to the ground safety valve and the wellhead safety valve in the station power pipeline (11), the spring driving device (33) is arranged at the output end of the driving cylinder (32), the safety lock (34) is used for contraction locking of the spring driving device (33) in a non-driving state, and the safety lock (34) is connected to the driving cylinder (32) by signal.

3. According to a wellhead safety monitoring and control system according to claim 2, the RTU control panel (21) is connected to the driving cylinder (32) and the safety lock (34) by signal, and the RTU control panel (21) sends an unlocking signal to the driving cylinder (32) according to the pressure signal collected by the multi-terminal pressure monitoring component (22), and then controls the safety lock (34) to be unlocked through the driving cylinder (32).

4. A wellhead safety monitoring and control system according to claim 3, characterized in that: The fusible plug (35) is used to vent the oil chamber of the driving cylinder (32) after the wellhead temperature rises to its melting temperature, so that the safety lock (34) unlocks the spring driving device (33). The energy released by the unlocked spring driving device (33) drives the output end of the driving cylinder (32) to switch the ground safety valve and the wellhead safety valve in the station power pipeline (11) to the closed state in turn.

5. A wellhead safety monitoring and control system according to claim 4, characterized in that: The accumulator group (26) is used to compensate for oil pressure leakage in the driving oil cylinder (32), and the electromagnetic pressure relief valve (29) is used to open the oil leakage port to discharge the oil pressure between the driving oil cylinder (32) and the electric booster pump group (24).

6. A wellhead safety monitoring and control system according to claim 5, characterized in that: The multi-terminal pressure monitoring component (22) is fixedly connected to the inner side of the RTU control panel (21), and the multi-terminal pressure monitoring component (22) is connected to a power supply via the terminal junction box (23).

Images