A gas main / standby switching system and an offshore platform gas supply system

Abstract

This invention discloses a gas main / standby switching system and an offshore platform gas supply system, relating to the field of gas control equipment technology. The gas main / standby switching system includes a first gas path module, a second gas path module, a main gas path, a pressure detection module, and a control module. The first gas path module includes a first gas path and at least one first on / off unit, which is located in the first gas path and used to control the on / off state of the first gas path. The second gas path module includes a second gas path and at least one second on / off unit, which is located in the second gas path and used to control the on / off state of the second gas path. The first and second gas paths merge and are connected to the main gas path. The pressure detection module is used to detect the pressure inside the pipe. The control module controls the on / off state of the first and second on / off units, preventing wellhead loss of control or production stagnation due to gas supply interruption. It operates automatically without human intervention, reducing the frequency of inspections and manual intervention.

Description

Technical Field

[0001] This invention relates to the field of gas control equipment technology, and more specifically, to a gas master / slave switching system. Furthermore, this invention also relates to a gas supply system for an offshore platform comprising the aforementioned components. Background Technology

[0002] In offshore oil and gas production platforms, gas control valves serve as key actuators for wellhead safety shut-off and production process control, and their reliable operation directly depends on a continuous and stable supply of driving gas. Offshore platforms face harsh operating conditions such as high salt spray, strong vibration, confined spaces, and inconvenient maintenance, and are increasingly moving towards unmanned operation and remote centralized control, placing higher demands on the automation level and reliability of gas supply.

[0003] Currently, traditional gas supply methods mostly employ a single gas source or a simple dual-source manual switching system. This involves setting up two sets of gas cylinders, a main one and a backup one, which are connected to supply gas via ball valves, check valves, pressure regulating valves, and pressure gauges. Under normal operating conditions, gas is supplied by the main gas source. When the pressure of the main gas source is too low or a malfunction occurs, maintenance personnel manually shut down the main gas source and activate the backup gas source to achieve switching. Such systems only have basic pressure monitoring and overflow protection functions, lacking automatic control, closed-loop pressure regulation, and fault diagnosis capabilities, thus revealing significant technical deficiencies.

[0004] Switching requires manual operation, resulting in significant response delays. Offshore platforms have a wide distribution of pneumatic control valves, some of which are located in hazardous areas with a high risk of oil and gas leaks. Maintenance personnel typically conduct inspections every 2 to 4 hours. Even if pressure alarms are issued promptly, the entire response process, from discovering the anomaly to completing safety precautions, arriving at the scene, and performing the switchover operation, takes at least 30 minutes. If the gas supply required to drive the pneumatic control valves is interrupted for more than 1 to 2 minutes, it will cause the valves to jam, preventing them from opening or closing properly. Especially in emergency situations such as abnormal wellhead pressure or oil and gas leaks, failure to promptly cut off the hazard source through the pneumatic control valves will directly lead to production stoppages or even safety accidents. Furthermore, existing components are not sufficiently adaptable to the strong vibrations and salt spray corrosion environment at sea. Key components such as check valves and pressure regulating valves are prone to jamming or failure, further impacting manual switchover operations.

[0005] In conclusion, how to enable gas supply systems to have autonomous switching capabilities is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a gas master / slave switching system that operates automatically without human intervention and ensures stable output pressure.

[0007] Another object of the present invention is to provide an offshore platform gas supply system including the above-described gas master / slave switching system.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A gas master / slave switching system, comprising:

[0010] The first air path module includes a first air path and at least one first on / off unit, wherein the first on / off unit is disposed in the first air path and is used to control the on / off state of the first air path;

[0011] The second air circuit module includes a second air circuit and at least one second on / off unit, wherein the second on / off unit is disposed in the second air circuit and is used to control the on / off state of the second air circuit;

[0012] The main air passage is connected to the main air passage after the first air passage and the second air passage merge.

[0013] A pressure detection module is used to detect the pressure inside the first gas path, the second gas path, and the main gas path;

[0014] The control module is used to control the on / off state of the first on / off unit and the second on / off unit according to the pressure signal collected by the pressure detection module, so as to realize the automatic switching of the first air path and the second air path.

[0015] Furthermore, the first on / off unit of the present invention includes:

[0016] A first solenoid valve and a first pneumatic ball valve, wherein the first pneumatic ball valve is located in the first air passage and is used to control the opening and closing of the first air passage, and the first solenoid valve is used to control the opening and closing of the first pneumatic ball valve.

[0017] The second on / off unit includes:

[0018] The second solenoid valve and the second pneumatic ball valve are located in the second air passage and are used to control the opening and closing of the second air passage. The second solenoid valve is used to control the opening and closing of the second pneumatic ball valve.

[0019] Furthermore, the first air path module further includes:

[0020] The first gas supply branch is connected at both ends to the first gas line and the first pneumatic ball valve, respectively, and is used to provide a gas source for the operation of the first pneumatic ball valve.

[0021] The second air path module also includes:

[0022] The second air supply branch is connected at both ends to the second air line and the second pneumatic ball valve, respectively, and is used to provide an air source for the operation of the second pneumatic ball valve.

[0023] Furthermore, the first on / off unit of the present invention further includes:

[0024] At least one first control valve is provided in the first gas supply branch and is used to control the on / off state of the first gas supply branch;

[0025] At least one first check valve is provided in the first gas supply branch;

[0026] The second switching unit further includes:

[0027] At least one second control valve is provided in the second gas supply branch and is used to control the on / off state of the second gas supply branch;

[0028] At least one second check valve is provided in the second gas supply branch.

[0029] Furthermore, the present invention also includes:

[0030] The first pressure regulating valve is connected to the inlet of the first pressure regulating valve after the first gas supply branch and the second gas supply branch converge.

[0031] The first relief valve is connected to the first pressure regulating valve.

[0032] Furthermore, the present invention also includes:

[0033] A second pressure regulating valve is located in the main gas path;

[0034] The second overflow valve is connected to the main air circuit.

[0035] Furthermore, the pressure detection module of the present invention includes:

[0036] The system comprises a first detector, a second detector, and a main detector. The first detector is located in the first gas path, the second detector is located in the second gas path, and the main detector is located in the main gas path. All three detectors are electrically connected to the control module.

[0037] Furthermore, the present invention also includes:

[0038] An inflation module is provided, comprising an inflation pipeline, a third pressure regulating valve, and a third overflow valve. The input end of the inflation pipeline is connected to the inflation device, and the output end of the inflation pipeline is connected to the first air path and the second air path after being split. The third pressure regulating valve is located in the inflation pipeline, and the third overflow valve is connected to the inflation pipeline.

[0039] Furthermore, the present invention also includes:

[0040] Several pressure gauges are respectively installed in the inflation pipeline, the first gas line, the second gas line, the first gas supply branch, the second gas supply branch and the main gas line to display the gas pressure in the corresponding pipeline.

[0041] A gas supply system for an offshore platform includes the aforementioned gas main / backup switching system.

[0042] The gas main / standby switching system provided by this invention employs two separately controlled gas paths connected to the main gas path. The first gas path is connected to the main gas source (such as a first gas cylinder group), and a first on / off unit is installed on the first gas path to control its on / off state. When the first on / off unit is open, gas from the main gas source can be supplied to the main gas path; when closed, the gas supply is cut off. The second gas path is connected to the standby gas source (such as a second gas cylinder group), and a second on / off unit is installed on the second gas path to control its on / off state. When the main gas source fails or is insufficient, the second on / off unit is opened, and the standby gas source is put into operation. The first and second gas paths merge and connect to the main gas path. The main gas path supplies the gas, after pressure regulation and stabilization, to the downstream gas control valve as the driving gas source. Specifically, the control module defaults to the first on / off unit being open and the second on / off unit being closed. The gas supply system continuously monitors the pressure of the first, second, and main gas lines via a pressure detection module. When the pressure in the first gas line falls below a set threshold (e.g., insufficient cylinder pressure) or exhibits abnormal fluctuations, the control module detects the fault and issues a command to shut down the first on / off unit while simultaneously opening the second on / off unit, switching the gas supply to the second gas line. This switching process is completed within seconds. After the switch, the control module continuously monitors the main gas line pressure. If the pressure deviates from the set range, compensation can be made by adjusting the subsequent pressure regulating unit to ensure stable output pressure. The automatic switching function allows the system to switch to the backup gas source within seconds when the main gas source pressure is insufficient, avoiding the response delay of more than a minute required for manual switching. This ensures that the pneumatic control valves receive a continuous gas supply, enabling fully automatic operation without manual intervention, which meets the intelligent and unmanned development needs of offshore platforms.

[0043] The present invention also provides an offshore platform gas supply system, including a gas master / slave switching system, to avoid wellhead loss of control or production stoppage due to gas supply interruption, unattended automatic operation, reduce inspection frequency and manual intervention, and reduce operation and maintenance costs. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the gas supply pipeline system provided by the present invention.

[0046] Figure 1 In the accompanying drawings, the reference numerals include:

[0047] 1. First air path module;

[0048] 11. First airway;

[0049] 12. First on / off unit;

[0050] 121. First pneumatic ball valve; 122. First solenoid valve; 123. First control valve; 124. First check valve;

[0051] 13. First gas supply branch;

[0052] 2. Second air path module;

[0053] 21. Second air passage;

[0054] 22. Second on / off unit;

[0055] 221. Second pneumatic ball valve; 222. Second solenoid valve; 223. Second control valve; 224. Second check valve;

[0056] 23. Second gas supply branch;

[0057] 3. Main air passage;

[0058] 4. Pressure detection module;

[0059] 41. Main detector;

[0060] 42. First detector;

[0061] 43. Second detector;

[0062] 5. First pressure regulating valve;

[0063] 6. First relief valve;

[0064] 7. Second pressure regulating valve;

[0065] 8. Second relief valve;

[0066] 9. Inflatable module;

[0067] 91. Inflation piping;

[0068] 92. Third pressure regulating valve;

[0069] 93. Third relief valve;

[0070] 10. Pressure gauge. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] The core of this invention is to provide a gas master / slave switching system that operates fully automatically without manual intervention, ensuring stable output pressure.

[0073] Another object of the present invention is to provide an offshore platform gas supply system including the above-described gas master / slave switching system.

[0074] Please refer to Figure 1 A gas main / standby switching system includes a first gas path module 1, a second gas path module 2, a main gas path 3, a pressure detection module 4, and a control module. The first gas path module 1 includes a first gas path 11 and at least one first on / off unit 12, which is located in the first gas path 11 and used to control the on / off state of the first gas path 11. The second gas path module 2 includes a second gas path 21 and at least one second on / off unit 22, which is located in the second gas path 21 and used to control the on / off state of the second gas path 21. The first gas path 11 and the second gas path 21 merge and are connected to the main gas path 3. The pressure detection module 4 is used to detect the pressure inside the first gas path 11, the second gas path 21, and the main gas path 3. The control module is used to control the on / off state of the first on / off unit 12 and the second on / off unit 22 according to the pressure signal collected by the pressure detection module 4, so as to realize the automatic switching of the first gas path 11 and the second gas path 21.

[0075] It should be noted that in this embodiment of the invention, both gas circuit modules include a gas supply device, which can be a gas storage tank.

[0076] In addition, in this embodiment of the invention, the connection between the two gas passages and the main gas passage 3 can be made using a three-way connector. At the same time, a one-way valve that opens only in the direction of the main gas passage 3 is provided in each of the two gas passages near the three-way connector. Therefore, after switching the two gas passages, it is ensured that the gas flows only in the main gas passage 3.

[0077] In one specific embodiment, the number of gas lines can be selected according to the actual use. Specifically, three or more gas sources can be set up as needed to form a multi-redundant backup system, and each gas line is equipped with a separate on / off unit and a separate gas storage tank to form separate control of each gas line.

[0078] In one specific embodiment, the on / off unit can be replaced by an electric ball valve, an electric butterfly valve, a pneumatic shut-off valve, etc., so that remote control can be achieved.

[0079] In a specific implementation of this invention, two separately controlled gas paths are connected to the main gas path 3. The first gas path module 1 includes a first gas path 11 and at least one first on / off unit 12. The first gas path 11 is connected to the main gas source (such as a first gas cylinder group). The first on / off unit 12 is disposed on the first gas path 11 and is used to control the on / off state of the first gas path 11. When the first on / off unit 12 is open, the main gas source gas can be delivered to the main gas path 3; when closed, the gas supply is cut off. The second gas path module 2 includes a second gas path 21. And at least one second on / off unit 22, the second gas passage 21 is connected to a backup gas source (such as a second gas cylinder group), the second on / off unit 22 is set on the second gas passage 21, used to control the on / off of the second gas passage 21. When the main gas source fails or the gas source is insufficient, the second on / off unit 22 is opened, and the backup gas source is put into gas supply. The first gas passage 11 and the second gas passage 21 merge and are connected to the main gas passage 3. The main gas passage 3 delivers the gas after pressure regulation and stabilization to the downstream gas control valve as the driving gas source. Specifically, The control module defaults to having the first on / off unit 12 open and the second on / off unit 22 closed, with air supplied by the first gas path 11. The pressure detection module 4 continuously monitors the pressure of the first gas path 11, the second gas path 21, and the main gas path 3. When the pressure of the first gas path 11 is lower than the set threshold (e.g., insufficient gas cylinder pressure) or abnormal fluctuations occur, the control module identifies a fault in the first gas path 11. The control module issues a command to close the first on / off unit 12 and simultaneously open the second on / off unit 22, switching the air supply to the second gas path 21. The switching process is completed within a few seconds. After the switching is completed, the control module continuously monitors the pressure of the main gas path 3. If the pressure deviates from the set range, it can be compensated by adjusting the subsequent pressure regulating unit to ensure stable output pressure. The automatic switching function allows the system to switch to the backup gas source within a few seconds when the main gas source pressure is insufficient, avoiding the response delay of more than 30 minutes required for manual switching. This ensures that the pneumatic control valve receives a continuous gas source, operates fully automatically without manual intervention, and meets the intelligent and unmanned development needs of offshore platforms.

[0080] Please refer to Figure 1 In some embodiments, the first on / off unit 12 includes a first solenoid valve 122 and a first pneumatic ball valve 121. The first pneumatic ball valve 121 is located in the first air passage 11 and is used to control the on / off state of the first air passage 11. The first solenoid valve 122 is used to control the opening and closing of the first pneumatic ball valve 121. The second on / off unit 22 includes a second solenoid valve 222 and a second pneumatic ball valve 221. The second pneumatic ball valve 221 is located in the second air passage 21 and is used to control the on / off state of the second air passage 21. The second solenoid valve 222 is used to control the opening and closing of the second pneumatic ball valve 221.

[0081] Meanwhile, the first air circuit module 1 also includes a first air supply branch 13, whose two ends are respectively connected to the first air circuit 11 and the first solenoid valve 122, for providing air source for the operation of the first pneumatic ball valve 121, and the second air circuit module 2 also includes a second air supply branch 23, whose two ends are respectively connected to the second air circuit 21 and the second solenoid valve 222, for providing air source for the operation of the second pneumatic ball valve 221.

[0082] That is, the first on / off unit 12 includes a first solenoid valve 122 and a first pneumatic ball valve 121. The first pneumatic ball valve 121 is disposed on the first air passage 11 and acts as an actuator to control the on / off state of the first air passage 11. The first solenoid valve 122 is used to control the opening and closing of the first pneumatic ball valve 121. It receives an electrical signal from the control module to control the compressed air from the first air supply branch 13 to enter the pneumatic control component of the first pneumatic ball valve 121, thereby driving the first pneumatic ball valve 121 to open or close. The first on / off unit 12 includes a first solenoid valve 122 and a first pneumatic ball valve 121. The first pneumatic ball valve 121 is disposed on the first air passage 11 and acts as an actuator to control the on / off state of the first air passage 11. The first solenoid valve 122 is used to control the opening and closing of the first air passage 121. The opening and closing of the pneumatic ball valve 121 is achieved by receiving an electrical signal from the control module, which controls the compressed air from the first air supply branch 13 to enter the pneumatic control component of the first pneumatic ball valve 121, thereby driving the first pneumatic ball valve 121 to open or close. In a specific embodiment, after the controller issues a command based on the pressure signal, the two solenoid valves (or the second solenoid valve 222) are energized or de-energized respectively, controlling the compressed air to enter the actuator of the corresponding pneumatic ball valve, driving the pneumatic ball valve to act, and realizing the rapid opening and closing of the corresponding air path. Since the pneumatic ball valve adopts a hard-seal structure, the cut-off is reliable and can withstand high pressure differential, making it suitable for high-pressure air source conditions on offshore platforms. Furthermore, the solenoid valve can control the high-pressure air path by receiving a weak electrical signal, realizing the isolation between the control circuit and the power circuit.

[0083] Furthermore, the first gas supply branch 13 is connected to the first pneumatic control ball valve 121 and the gas supply equipment, while the second gas supply branch 23 is connected to the second pneumatic control ball valve 221 and the gas supply equipment.

[0084] Please refer to Figure 1 In some embodiments, the first on / off unit 12 further includes at least one first control valve 123 and at least one first check valve 124, which are disposed in the first gas supply branch 13 and used to control the on / off of the first gas supply branch 13. The second on / off unit 22 further includes at least one second control valve 223 and at least one second check valve 224, which are disposed in the second gas supply branch 23 and used to control the on / off of the second gas supply branch 23. The second check valve 224 is disposed in the second gas supply branch 23.

[0085] In other words, the control valve (such as a manual ball valve) is used to control the opening and closing of the two gas supply branches, making it easy to cut off the gas source during maintenance. The two check valves are used to prevent gas backflow and ensure that gas does not flow back into the gas path after the solenoid valve is activated. Therefore, during normal operation, the first control valve 123 and the second control valve 223 remain open. When it is necessary to repair the solenoid valve or the gas supply branch, the corresponding control valve can be manually closed to cut off the gas source. At the same time, the check valve prevents the backflow of residual gas in the pipeline, ensuring maintenance safety. The check valve also isolates the main gas path 3 from the gas supply branches, preventing pressure fluctuations caused by the activation of the solenoid valve from affecting the main gas path 3, ensuring the safety of maintenance personnel. In addition, the check valve prevents the spread of faults. A fault in one path will not affect other branches. With multiple isolation designs, even if a single component fails, the system can still maintain basic functions.

[0086] Please refer to Figure 1 In some embodiments, in order to improve the stability of the control of the two pneumatic ball valves, a first pressure regulating valve 5 is provided. The first gas supply branch 13 and the second gas supply branch 23 are connected to the inlet of the first pressure regulating valve 5 after they merge. That is, the gas flowing in the first gas supply branch 13 and the second gas supply branch 23 both pass through the pressure regulating valve. After pressure regulation and stabilization, the gas meets the working pressure of the two pneumatic ball valves.

[0087] Furthermore, by setting a first overflow valve 6, which is connected to the first pressure regulating valve 5 and is located on the outlet or inlet side of the pressure regulating valve, when the pressure of the upstream (two gas supply branches) exceeds the set value, the overflow valve located on the inlet side automatically opens to release pressure, preventing high-pressure gas from damaging the pressure regulating valve and downstream components. The overflow valve can also be set between the pressure regulating valve and the solenoid valve. When the pressure of the upstream (two gas supply branches) exceeds the set value, the overflow valve located on the inlet side automatically opens to release pressure, preventing high-pressure gas from damaging the solenoid valve.

[0088] Two gas supply branches are combined via a three-way connector and then connected to a pressure regulating valve. The output end of the pressure regulating valve is also equipped with a three-way connector, which splits the flow and connects to two pneumatic ball valves respectively, thus forming the circuit of the first gas supply branch 13 and the second gas supply branch 23. The same set of pressure regulating valves is used, which can reduce the number of system components, reduce costs, effectively reduce leakage points, and ensure consistent gas supply pressure.

[0089] Please refer to Figure 1In some embodiments, the gas supply system further includes a second pressure regulating valve 7 and a second overflow valve 8. The second pressure regulating valve 7 is located in the main gas path 3, and the second overflow valve 8 is connected to the main gas path 3. The second pressure regulating valve 7, located downstream of the first pressure regulating valve 5, is used for secondary fine-tuning of the gas pressure, further improving the stability of the output pressure of the main gas path 3. The second overflow valve 8, connected to the main gas path 3, is typically located on the outlet side of the second pressure regulating valve 7. When the pressure in the main gas path 3 exceeds a set value, the second overflow valve 8 automatically opens to release pressure, ensuring the stability of the gas output from the main gas path 3.

[0090] Please refer to Figure 1 In some embodiments, the pressure detection module 4 includes a first detector 42, a second detector 43, and a main detector 41. The first detector 42 is located in the first gas path 11, the second detector 43 is located in the second gas path 21, and the main detector 41 is located in the main gas path 3. The first detector 42, the second detector 43, and the main detector 41 are all electrically connected to the control module. The three detectors (all pressure sensors) transmit pressure signals to the control module in real time. The control module determines the status of the main gas source and performs switching by comparing the values ​​of the first detector 42 and the second detector 43. The value of the main detector 41 determines whether the output pressure is stable. If necessary, the pressure regulating valve is adjusted for compensation. The pressure of the entire link from the gas source to the end can be monitored without blind spots. The multi-point pressure data makes the switching logic more accurate and avoids malfunctions.

[0091] In one specific embodiment, the control module also includes a storage function, that is, pressure data can be stored in the control module for trend analysis and preventive maintenance.

[0092] In one specific embodiment, the control module further includes a remote control unit, which receives remote signals through the remote control unit, thereby enabling remote control of the gas supply system.

[0093] Please refer to Figure 1In some embodiments, the gas supply system further includes a gas filling module 9, which includes a gas filling pipeline 91, a third pressure regulating valve 92, and a third overflow valve 93. The input end of the gas filling pipeline 91 is connected to the gas filling equipment, and the output end of the gas filling pipeline is connected to the first gas path 11 and the second gas path 21 after being split. The third pressure regulating valve is located in the gas filling pipeline 91, and the third overflow valve 93 is connected to the gas filling pipeline 91. That is, the input end of the gas filling pipeline 91 is connected to an external gas filling device (such as a high-pressure compressor, nitrogen). The system is connected to cylinders, air compressors, etc., and the output end is split and connected to the first gas line 11 and the second gas line 21 respectively. When the pressure of the main gas source or backup gas source cylinder is insufficient, there is no need to replace the cylinder. Just connect the filling equipment to the input end of the filling pipeline 91 and start the filling process. The third pressure regulating valve 92 controls the filling pressure within the safe range of the cylinder. The gas is filled into the cylinders of the first gas line 11 and the second gas line 21 through the split pipeline. During the filling process, the third overflow valve 93 ensures the safety of the system.

[0094] Therefore, the direct inflation method eliminates the need to transport heavy gas cylinders, allowing for gas refilling on-site at the platform. This reduces the workload of transporting and replacing gas cylinders, as well as the number of spare gas cylinders to be stored, making it suitable for the confined space of offshore platforms.

[0095] In one specific embodiment, a one-way valve may be provided in the inflation line 91 to prevent gas from flowing back from the cylinder to the inflation device.

[0096] In one specific embodiment, a pressure gauge 10 and a shut-off valve can be installed in the inflation line 91 to facilitate control of the inflation process.

[0097] Please refer to Figure 1 In some embodiments, a plurality of pressure gauges 10 are also included. The plurality of pressure gauges 10 are respectively installed in the inflation pipeline 91, the first gas line 11, the second gas line 21, the first gas supply branch 13, the second gas supply branch 23 and the main gas line 3, for displaying the gas pressure in the corresponding pipeline. That is, the pressure gauges 10 directly display the real-time pressure value of the corresponding pipeline without relying on a remote monitoring system. On-site inspection personnel can quickly check key parameters such as the pressure of each gas source, the gas supply pressure, and the pressure after pressure adjustment to determine whether the system is operating normally.

[0098] In one specific embodiment, the pressure gauge 10 can be a shock-resistant and corrosion-resistant type to adapt to the harsh environment of offshore platforms.

[0099] In one specific embodiment, a digital pressure gauge 10 with local display function may be used.

[0100] A gas supply system for offshore platforms includes a gas master / slave switching system. The system ensures continuous gas supply to gas control valves through automatic master / slave switching, preventing wellhead loss of control or production stoppage due to gas supply interruption. It operates automatically without human intervention, reducing the frequency of inspections and manual intervention, and lowering operation and maintenance costs. At the same time, it can remotely detect and store historical data, providing data support for preventive maintenance.

[0101] In other words, the key point of this invention is that: the control module defaults to opening the first on / off unit 12 and closing the second on / off unit 22, with air supplied by the first air passage 11. The pressure detection module 4 continuously monitors the pressure of the first air passage 11, the second air passage 21, and the main air passage 3. When the pressure of the first air passage 11 is lower than the set threshold (e.g., insufficient gas cylinder pressure) or abnormal fluctuations occur, the control module identifies a fault in the first air passage 11 and issues a command to close the first on / off unit 12 and simultaneously open the second on / off unit 22, switching the air supply to the second air passage 21. The switching process is completed within a few seconds. After the switching is completed, the control module continuously monitors the pressure of the main air passage 3. If the pressure deviates from the set range, it can be compensated by adjusting the subsequent pressure regulating unit to ensure stable output pressure. The automatic switching function enables the system to switch to the backup gas source within a few seconds when the main gas source pressure is insufficient, avoiding the response delay of more than 30 minutes required for manual switching. This ensures that the pneumatic control valve obtains a continuous gas source, operates fully automatically without manual intervention, and meets the intelligent and unmanned development needs of offshore platforms.

[0102] In addition to the gas master / standby switching system disclosed in the above embodiments, the present invention also provides an offshore platform gas supply system including the above-mentioned gas master / standby switching system. The structure of other parts of the offshore platform gas supply system is described in the prior art and will not be repeated here.

[0103] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] The foregoing has provided a detailed description of a gas master / slave switching system and an offshore platform gas supply system provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A gas master / slave switching system, characterized in that, include: The first air path module (1) includes a first air path (11) and at least one first on / off unit (12). The first on / off unit (12) is disposed in the first air path (11) and is used to control the on / off of the first air path (11). The second air circuit module (2) includes a second air circuit (21) and at least one second on / off unit (22). The second on / off unit (22) is disposed in the second air circuit (21) and is used to control the on / off of the second air circuit (21). The main air passage (3) is connected to the first air passage (11) and the second air passage (21) after they converge. Pressure detection module (4), the pressure detection module (4) is used to detect the pipe pressure of the first gas path (11), the second gas path (21) and the main gas path (3); The control module is used to control the on / off state of the first on / off unit (12) and the second on / off unit (22) according to the pressure signal collected by the pressure detection module (4), so as to realize the automatic switching of the first air path (11) and the second air path (21).

2. The gas master / slave switching system according to claim 1, characterized in that, The first on / off unit (12) includes: The first solenoid valve (122) and the first pneumatic ball valve (121) are provided in the first air passage (11) and are used to control the opening and closing of the first air passage (11). The first solenoid valve (122) is used to control the opening and closing of the first pneumatic ball valve (121). The second on / off unit (22) includes: The second solenoid valve (222) and the second pneumatic ball valve (221) are located in the second air passage (21) and are used to control the opening and closing of the second air passage (21). The second solenoid valve (222) is used to control the opening and closing of the second pneumatic ball valve (221).

3. The gas master / slave switching system according to claim 2, characterized in that, The first gas path module (1) also includes: The first gas supply branch (13) is connected at both ends to the first gas line (11) and the first pneumatic ball valve (121) respectively, and is used to provide a gas source for the operation of the first pneumatic ball valve (121); The second air circuit module (2) also includes: The second gas supply branch (23) is connected at both ends to the second gas line (21) and the second pneumatic ball valve (221) respectively, and is used to provide a gas source for the operation of the second pneumatic ball valve (221).

4. The gas master / slave switching system according to claim 3, characterized in that, The first on / off unit (12) further includes: At least one first control valve (123) is provided in the first gas supply branch (13) and is used to control the opening and closing of the first gas supply branch (13); At least one first check valve (124) is provided in the first gas supply branch (13). The second switching unit (22) further includes: At least one second control valve (223) is provided in the second gas supply branch (23) and is used to control the opening and closing of the second gas supply branch (23); At least one second check valve (224) is provided in the second gas supply branch (23).

5. The gas master / slave switching system according to claim 3, characterized in that, Also includes: The first pressure regulating valve (5) is connected to the inlet of the first pressure regulating valve (5) after the first gas supply branch (13) and the second gas supply branch (23) converge. The first overflow valve (6) is connected to the first pressure regulating valve (5).

6. The gas master / slave switching system according to any one of claims 3-5, characterized in that, Also includes: The second pressure regulating valve (7) is located in the main air passage (3); The second overflow valve (8) is connected to the main air passage (3).

7. The gas master / slave switching system according to claim 6, characterized in that, The pressure detection module (4) includes: The system comprises a first detector (42), a second detector (43), and a main detector (41). The first detector (42) is located in the first gas path (11), the second detector (43) is located in the second gas path (21), and the main detector (41) is located in the main gas path (3). The first detector (42), the second detector (43), and the main detector (41) are all electrically connected to the control module.

8. The gas master / slave switching system according to claim 7, characterized in that, Also includes: An inflation module (9) is provided, comprising an inflation pipeline (91), a third pressure regulating valve (92) and a third overflow valve (93). The input end of the inflation pipeline (91) is connected to an inflation device, and the output end of the inflation pipeline (91) is connected to the first air path (11) and the second air path (21) respectively after being split. The third pressure regulating valve (92) is located on the inflation pipeline (91), and the third overflow valve (93) is connected to the inflation pipeline (91).

9. The gas master / slave switching system according to claim 8, characterized in that, Also includes: Several pressure gauges (10) are respectively installed in the inflation pipeline (91), the first gas path (11), the second gas path (21), the first gas supply branch (13), the second gas supply branch (23) and the main gas path (3) to display the gas pressure in the corresponding pipeline.

10. An offshore platform gas supply system, characterized in that, Includes the gas master / slave switching system as described in any one of claims 1-9.

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