Underwater test tree and check valve electro-hydraulic compound control system and method

Abstract

The invention relates to the technical field of deepwater oil gas and combustible ice exploitation testing, and discloses an underwater test tree and check valve electro-hydraulic compound control system and method. The system comprises a ground control terminal, an umbilical cable transmission system, a ground emergency control system, an underwater energy accumulator system, an actuator control system, a pressure compensation control system, a check valve and an underwater test tree. An instruction is sent through a ground control terminal, an electromagnetic reversing valve is controlled through an umbilical cable, then a plurality of hydraulic control reversing valves are controlled, high-pressure hydraulic oil of an underwater energy accumulator set is input into an underwater test tree and a check valve, and a ground emergency control system can directly control the underwater test tree to complete a release task through the hydraulic control reversing valves. Electro-hydraulic compound control of the underwater test tree and the check valve by the ground is realized, the problems of low system response speed, disordered control circuit and poor safety are effectively solved, the system has the characteristics of high reliability, high fault resistance, convenience in maintenance and the like, and the safety of deepwater test operation is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of deep-water oil and gas and combustible ice extraction testing technology, specifically to an underwater test tree and check valve electro-hydraulic composite control system and method. Background Technology

[0002] Deepwater formation testing (referred to as deepwater testing) is a crucial step in the exploitation of deepwater oil and gas, as well as methane hydrate, enabling timely discovery and accurate evaluation of deepwater reservoirs. Existing mainstream floating platforms suffer from limitations due to limited space and a high density of equipment and personnel. If a blowout or oil / gas leak occurs during testing, it could trigger a series of serious consequences, including explosions, personnel poisoning, and environmental pollution.

[0003] Because the environment in the South my country Sea is more severe than in other deep-sea areas of the world, when encountering special sea conditions during deep-water oil and gas and combustible ice production testing operations, it is essential to use a drop string system to promptly seal the high-pressure oil and gas inside the test string, quickly disconnect the test string, and then rapidly evacuate the drilling platform to ensure the safety of the platform and personnel. The most crucial components in achieving drop string disconnection are the subsea test tree and check valve. The control system of the subsea test tree and check valve is key to realizing their core functions such as shearing, sealing, releasing, and reconnection. Among them, the electro-hydraulic composite control system is currently the most advanced control system, and its excellent response time characteristics have given it an unshakeable position in the deep-water testing equipment market.

[0004] Currently, the key technologies for underwater test trees and check valve control systems are monopolized by foreign countries, which only lease them to China and do not sell them. However, the existing technologies have the following problems in use:

[0005] 1. The underwater test tree and check valve control system has gone through three stages: direct hydraulic control, pilot hydraulic control, and electro-hydraulic control. Due to design issues with the electro-hydraulic control circuitry, the electro-hydraulic control system has a slow control response speed, resulting in failure to detach in time, and often experiences hydraulic control failure, leading to the inability to input hydraulic oil.

[0006] 2. Due to the increasingly harsh environment for deep-sea oil and gas and combustible ice development, and the complex underwater conditions, the control module often fails in the event of an emergency. The lack of emergency measures leads to the failure of the underwater test tree connector, which cannot be unlocked in time.

[0007] 3. Electro-hydraulic control often uses solenoid valves to control hydraulic directional valves, resulting in numerous cables and pipelines. Furthermore, a single umbilical cable is often used to connect all pipelines from the surface to the underwater surface, leading to complex manufacturing and difficulty in identifying the cause of failures, making repairs difficult when malfunctions occur.

[0008] 4. The static pressure in deep water is high, and the control circuit did not take into account the protection measures. As a result, the tubing often fails to detach in time due to the excessive pressure difference when it is unlocked, which poses a safety risk to deep-sea testing operations.

[0009] Therefore, as deep-sea oil and gas and combustible ice extraction operations continue to develop towards ultra-deep water, safety, stability, and economy have become key concerns. It is necessary to invent an underwater test tree and check valve electro-hydraulic composite control system and method to solve the above-mentioned problems of the placement string control and meet the safety requirements of deep-water testing. Summary of the Invention

[0010] This invention addresses the technical challenges of slow unlocking response, frequent control failures, difficulty in maintenance, and inability to effectively handle faults in underwater test trees and check valves in tubular systems. It proposes an electro-hydraulic composite control system and method for underwater test trees and check valves to solve the above problems.

[0011] This invention improves the system's response speed and solves the problem of control circuit disorder by optimizing the circuitry of the underwater test tree and check valve electro-hydraulic composite control system. By setting up a ground-based emergency control system, the ground control terminal can directly control the underwater test tree via a shear directional valve, solving the problem of the underwater test tree's inability to respond promptly when the control system malfunctions. By controlling multiple hydraulically controlled directional valves with the same function using a single electromagnetic directional valve, it achieves two-level control of the hydraulically controlled directional valves, solving the problems of low space utilization of the umbilical cable and difficult system maintenance. Furthermore, by adopting a pressure failure protection mechanism, it solves the problems of difficulty in draining hydraulic oil from the actuator control system and easy damage to the check valve under different water depths and pressures.

[0012] The objective of this invention is achieved through the following technical solution: an electro-hydraulic composite control system for an underwater test tree and a check valve, characterized in that it includes: a ground control terminal, an umbilical cable transmission system, a ground emergency control system, an underwater accumulator system, an actuator control system, a pressure compensation control system, a check valve, and an underwater test tree;

[0013] The umbilical cable transmission system includes an umbilical cable winch and an umbilical cable;

[0014] The ground emergency control system includes a shear directional valve, a hydraulic directional valve A, and a hydraulic directional valve B. The I end of the shear directional valve is connected to the ground control terminal via an umbilical cable, and the control ends of the hydraulic directional valve A and the hydraulic directional valve B are connected to the low-pressure control terminal line of the solenoid directional valve E via an umbilical cable.

[0015] The underwater accumulator system includes an underwater accumulator group and an electromagnetic reversing valve D. The underwater accumulator system is connected to the actuator control system via an umbilical cable. The U port of the electromagnetic reversing valve D is used for low-pressure relief.

[0016] The actuator control system includes an underwater test tree connector control circuit, an underwater test tree ball valve control circuit, an underwater test tree lower ball valve control circuit, and a check valve control circuit. The underwater test tree connector control circuit includes solenoid directional valve A, solenoid directional valve B, hydraulically controlled directional valve C, and hydraulically controlled directional valve D. Solenoid directional valve A is connected to terminal III of a shear directional valve via an umbilical cable. Hydraulically controlled directional valve C is connected to terminal IV of a shear directional valve via an umbilical cable through hydraulically controlled directional valve B. The umbilical cable of solenoid directional valve B is connected to the control terminal of hydraulically controlled directional valve D. The circuit of hydraulically controlled directional valve C is connected to the reset terminal of all hydraulically controlled directional valves except for hydraulically controlled directional valve C. The underwater test tree ball valve control circuit includes solenoid directional valve E, solenoid directional valve F, hydraulically controlled directional valve G, hydraulically controlled directional valve H, and hydraulically controlled directional valve I. The electromagnetic directional valve E is connected to the control terminal of the hydraulic directional valve G via an umbilical cable. The electromagnetic directional valve F is simultaneously connected to the control terminals of both the hydraulic directional valve H and the hydraulic directional valve I via an umbilical cable. The hydraulic directional valve G is connected to the reset terminal of the hydraulic directional valve C via an umbilical cable. The underwater test tree ball valve control circuit includes electromagnetic directional valve G, electromagnetic directional valve H, hydraulic directional valve J, hydraulic directional valve K, and hydraulic directional valve L. Electromagnetic directional valve G is connected to the control terminal of the hydraulic directional valve J via an umbilical cable. Electromagnetic directional valve H is simultaneously connected to the control terminals of both the hydraulic directional valve K and the hydraulic directional valve L via an umbilical cable. The check valve control circuit includes electromagnetic directional valve C, hydraulic directional valve E, and hydraulic directional valve F. Electromagnetic directional valve C is simultaneously connected to the control terminals of both the hydraulic directional valve E and the hydraulic directional valve F via an umbilical cable.

[0017] The pressure compensation control system includes pressure compensation lines A, B, C, D, and E. Lines A, B, C, D, and E each include a pressure compensator, a check valve, and a throttle valve. The J terminal of the ground emergency control system is connected to pressure compensation line A via an umbilical cable. The K and L terminals of the underwater test tree connector control line are connected to pressure compensation line B via an umbilical cable. The O, P, and Q terminals of the ball valve control line on the underwater test tree are connected to pressure compensation line C via an umbilical cable. The R, S, and T terminals of the ball valve control line below the underwater test tree are connected to pressure compensation line D via an umbilical cable. The M and N terminals of the check valve control line are connected to pressure compensation line E via an umbilical cable.

[0018] Among them, solenoid directional valves A and D are normally closed solenoid directional valves; solenoid directional valves B, C, E, F, G, and H are normally closed solenoid directional valves; hydraulically controlled directional valves A, C, D, E, G, H, J, and K are normally closed hydraulically controlled directional valves; and hydraulically controlled directional valves B, F, I, and L are normally open hydraulically controlled directional valves.

[0019] A method for electro-hydraulic composite control of an underwater test tree and a check valve, employing any of the aforementioned electro-hydraulic composite control systems for an underwater test tree and a check valve, includes the following steps:

[0020] Emergency evacuation procedure:

[0021] S1: The underwater test tree and check valve are controlled by high-pressure hydraulic oil input through the underwater accumulator system via the underwater test tree connector control circuit, the ball valve control circuit on the underwater test tree, the ball valve control circuit below the underwater test tree, and the check valve control circuit. Multiple pressure compensation circuits provide pressure compensation. Terminal I of the shear directional valve in the ground emergency control system is connected to the ground control terminal. When the solenoid directional valve A is not faulty, the low-pressure hydraulic oil in the ground emergency control system pipeline passes sequentially through the solenoid directional valve A, the shear directional valve III port, and the IV port, and is connected to the control terminal of the hydraulically controlled directional valve C. When the solenoid directional valve A fails, the shear directional valve is activated by adding a shear directional valve. The pressure at port I causes the shear directional valve to switch, or the pressure at port II of the shear directional valve is reduced (by opening the ball valve on the underwater test tree to energize the solenoid directional valve E, causing the hydraulic directional valve A to switch; port II of the shear directional valve is connected to seawater, causing the valve stem inside the shear directional valve to fail under tension and switch). The low-pressure hydraulic oil in the ground emergency control pipeline after these two methods is connected to port IV through port I of the shear directional valve to control the hydraulic directional valve C. In addition, the ground emergency control system is also equipped with a hydraulic directional valve B, so that when the ball valve control circuit on the underwater test tree opens the ball valve, the underwater test tree connector control circuit cannot unlock the connector.

[0022] S2: Open the check valve control circuit. Low-pressure hydraulic oil from the ground control terminal controls the hydraulic directional valves E and F to switch via the solenoid directional valve C. High-pressure hydraulic oil controls the check valve to close via the underwater accumulator group through the hydraulic directional valves E and F. Then close the check valve control circuit.

[0023] S3: Open the ball valve control circuit on the underwater test tree. Low-pressure hydraulic oil from the ground control terminal opens the hydraulic control directional valve G through the solenoid directional valve E. Then, high-pressure hydraulic oil enters the underwater test tree through the underwater accumulator group and the hydraulic control directional valve G to open the upper ball valve. Then, close the ball valve control circuit on the underwater test tree.

[0024] S4: Open the ball valve control circuit of the underwater test tree. Low-pressure hydraulic oil from the ground control terminal opens the hydraulic control valve J through the solenoid directional valve G. Then, high-pressure hydraulic oil enters the underwater test tree through the underwater accumulator group and the hydraulic control valve J to open the lower ball valve. Then close the ball valve control circuit of the underwater test tree.

[0025] S5: The underwater test tree connector control circuit is activated. Low-pressure hydraulic oil from the ground control terminal opens the hydraulic control directional valve C through the solenoid directional valve A. Then, high-pressure hydraulic oil passes through the underwater accumulator group and the hydraulic control directional valve C to unlock the underwater test tree connector. The unlocking line in the underwater test tree connector control circuit is connected to the reset end of the hydraulic control directional valves other than the hydraulic control directional valve C, ensuring that when the underwater test tree connector is unlocked, the other hydraulic control directional valves are in their original positions. The opening line of the hydraulic control directional valve G in the ball valve control circuit of the underwater test tree is connected to the reset end of the hydraulic control directional valve C, ensuring that the underwater test tree connector cannot be unlocked when the ball valve on the underwater test tree is not closed.

[0026] Reconnection steps:

[0027] S1: Open the check valve control circuit. Low-pressure hydraulic oil from the ground control terminal controls the hydraulic directional valves E and F to switch via the solenoid directional valve C. High-pressure hydraulic oil controls the check valve to open via the underwater accumulator group through the hydraulic directional valves E and F. Then close the check valve control circuit.

[0028] S2: Open the ball valve control circuit on the underwater test tree. Low-pressure hydraulic oil from the ground control terminal passes through the solenoid directional valve F to open the hydraulic directional valve H and the hydraulic directional valve I. Then, high-pressure hydraulic oil passes through the underwater accumulator group, through the hydraulic directional valve H and the hydraulic directional valve I, and enters the underwater test tree to close the upper ball valve. Then, close the ball valve control circuit on the underwater test tree.

[0029] S3: Open the ball valve control circuit under the underwater test tree. Low-pressure hydraulic oil from the ground control terminal passes through the solenoid directional valve H to open the hydraulic directional valves K and L. Then, high-pressure hydraulic oil passes through the underwater accumulator group, through the hydraulic directional valves K and L, and enters the underwater test tree to close the lower ball valve. Then, close the ball valve control circuit under the underwater test tree.

[0030] S4: Open the underwater test tree connector control circuit. Low-pressure hydraulic oil from the ground control terminal opens the hydraulic control directional valve D through the solenoid directional valve B. Then, high-pressure hydraulic oil enters the underwater test tree connector through the hydraulic control directional valve D from the underwater accumulator group for reconnection.

[0031] The underwater test tree unlocking steps are as follows:

[0032] The ground control terminal sends an unlock signal, then stops the underwater testing and mining operations. The ground control terminal then controls the check valve control circuit to close the check valve, then opens the upper and lower ball valves to seal it, and finally unlocks the underwater test tree connector.

[0033] The underwater test tree reconnection steps are as follows:

[0034] The ground control terminal sends a reconnection signal, which then controls the closure of the upper and lower ball valves, the opening of the check valve, and finally the reconnection of the underwater test tree connector.

[0035] The beneficial effects of this invention are as follows:

[0036] 1. This invention optimizes the circuitry of the electro-hydraulic composite control system for the underwater test tree and check valve, enabling the underwater test tree to unlock and reconnect connectors, switch on and off upper and lower ball valves, and stably switch on and off the check valve under different environments during deep-water testing operations and combustible ice mining. This effectively improves the response speed of the underwater test tree and check valve.

[0037] 2. This invention establishes a ground-based emergency control system, enabling the ground control terminal to directly control the underwater test tree by shearing the reversing valve in the event of control failure due to electromagnetic reversing valve damage. This allows for connector unlocking and reconnection, effectively improving the control system's resistance to environmental interference.

[0038] 3. This invention adds a mechanism for controlling multiple hydraulic directional valves with an electromagnetic directional valve, realizing two-level control of hydraulic directional valves with the same function, and can accurately and quickly locate damaged hydraulic directional valves, effectively improving the space utilization of the umbilical cable and the repair speed of damaged hydraulic directional valves.

[0039] 4. This invention adopts a pressure failure protection mechanism for the pressure compensation circuit connected to the reset end of the hydraulic control directional valve, which effectively improves the durability of the check valve under deep water pressure and enables the timely discharge of hydraulic oil from the actuator control system under different deep water pressures, ensuring smooth and unblocked hydraulic circuits of the control system. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the electro-hydraulic composite control system of the present invention;

[0041] Figure 2 This is a schematic diagram of the electro-hydraulic composite control system of the present invention;

[0042] Figure 3 This is a schematic diagram of the umbilical cable transmission system of the present invention;

[0043] Figure 4 This is a schematic diagram of the pressure compensation circuit of the present invention;

[0044] Figure 5 This is a flowchart of the ground emergency control system of the present invention;

[0045] Figure 6 This is the underwater test tree connector unlocking process of the present invention;

[0046] In the diagram, 1. Ground control terminal; 2. Umbilical cable transmission system; 3. Ground emergency control system; 4. Underwater accumulator system; 5. Actuator control system; 6. Pressure compensation control system; 7. Check valve; 8. Underwater test tree; 101. Underwater test tree connector control circuit; 102. Upper ball valve control circuit on the underwater test tree; 103. Lower ball valve control circuit on the underwater test tree; 104. Check valve control circuit; 111. Pressure compensation circuit A; 112. Pressure compensation circuit B; 113. Pressure compensation circuit C; 114. Pressure compensation circuit D; 115. Pressure compensation circuit E; 201. Underwater accumulator group; 211. Shear directional valve; 221. Solenoid directional valve A; 222. Solenoid directional valve B. 223. Solenoid directional valve C; 224. Solenoid directional valve D; 225. Solenoid directional valve E; 226. Solenoid directional valve F; 227. Solenoid directional valve G; 228. Solenoid directional valve H; 231. Hydraulic directional valve A; 232. Hydraulic directional valve B; 233. Hydraulic directional valve C; 234. Hydraulic directional valve D; 235. Hydraulic directional valve E; 236. Hydraulic directional valve F; 237. Hydraulic directional valve G; 238. Hydraulic directional valve H; 239. Hydraulic directional valve I; 240. Hydraulic directional valve J; 241. Hydraulic directional valve K; 242. Hydraulic directional valve L; 301. Umbilical cable winch; 302. Umbilical cable; 401. Pressure compensator; 402. Check valve; 403. Throttle valve. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, but this does not constitute any limitation on the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] This invention proposes an electro-hydraulic composite control system and method for underwater test trees and check valves, which features fast response time and high reliability, and can ensure the safe operation of underwater test trees and check valves located in tubing.

[0049] like Figure 1 As shown, an electro-hydraulic composite control system for an underwater test tree and check valve is characterized by comprising: a ground control terminal 1, an umbilical cable transmission system 2, a ground emergency control system 3, an underwater accumulator system 4, an actuator control system 5, a pressure compensation control system 6, a check valve 7, and an underwater test tree 8; the actuator control system 5 includes an underwater test tree connector control line 101, an underwater test tree upper ball valve control line 102, an underwater test tree lower ball valve control line 103, and a check valve control line 104; the pressure compensation control system 6 includes pressure compensation lines A111, B112, C113, D114, and E115.

[0050] like Figure 2 As shown, the electro-hydraulic composite control system includes: an underwater accumulator group 201, a shearing directional valve 211, an electromagnetic directional valve A221, an electromagnetic directional valve B222, an electromagnetic directional valve C223, an electromagnetic directional valve D224, an electromagnetic directional valve E225, an electromagnetic directional valve F226, an electromagnetic directional valve G227, an electromagnetic directional valve H228, a hydraulically controlled directional valve A231, a hydraulically controlled directional valve B232, a hydraulically controlled directional valve C233, a hydraulically controlled directional valve D234, a hydraulically controlled directional valve E235, a hydraulically controlled directional valve F236, a hydraulically controlled directional valve G237, a hydraulically controlled directional valve H238, a hydraulically controlled directional valve I239, a hydraulically controlled directional valve J240, a hydraulically controlled directional valve K241, and a hydraulically controlled directional valve L242, all connected via an umbilical cable 302. Port A is a low-pressure relief channel connected to the solenoid directional valves 221, 222, 223, 224, 225, 226, 227, and 228. It discharges low-pressure oil and inputs electrical signals to ports B, C, D, E, F, G, H, and L to control the solenoid directional valves to perform directional operations. Then, the solenoid directional valves control multiple hydraulic directional valves to input high-pressure hydraulic oil from the underwater accumulator system 4 into the underwater actuator for operation, and are connected via umbilical cable 302.

[0051] like Figure 3 As shown, the umbilical cable transmission system includes an umbilical cable winch 301 and an umbilical cable 302, with the umbilical cable 302 used to connect various system devices.

[0052] like Figure 4 As shown, the pressure compensation circuit includes: a pressure compensator 401, a check valve 402, and a throttle valve 403. The pressure compensator 401 is installed at the return oil line to establish the system pressure above the seawater pressure, facilitating the discharge of hydraulic oil into the sea. The reset terminals of all hydraulic directional valves except for the hydraulic directional valve B232 are connected to the pressure compensator 401, allowing the hydraulic directional valves to operate normally at sea.

[0053] like Figure 5 The diagram illustrates the operation flow of the ground emergency control system 3. When the solenoid directional valve A221 is functioning correctly, the low-pressure fluid in the ground emergency control pipeline sequentially passes through solenoid directional valve A221, shear directional valve ports III and IV, and is connected to the control terminal of the hydraulically controlled directional valve C233 for unlocking. When solenoid valve A221 malfunctions, there are two solutions: First, increase the pressure at the ground emergency control point, causing an increase in pressure at shear directional valve port I, leading to reversal. Second, decrease the pressure at shear directional valve port II, opening the ball valve on the underwater test tree to energize solenoid directional valve E225, causing hydraulically controlled directional valve A231 to reverse. Shear directional valve port II is then connected to seawater, causing the internal valve stem of the shear directional valve to fail under tension, resulting in reversal. In both methods, the high-pressure fluid in the ground emergency control pipeline is connected to port IV via shear directional valve port I, enabling control of hydraulically controlled directional valve C233. In addition, the ground emergency control system 3 is equipped with a safety interlock valve hydraulic directional valve B232, which ensures that when the ball valve on the underwater test tree is opened and the control line is connected, the underwater test tree connector is disconnected and the control line cannot be connected.

[0054] like Figure 6 The diagram shows the overall process of unlocking the underwater test tree. Successful unlocking requires the check valve to be closed, the upper / lower ball valves of the underwater test tree to be closed, and other underwater actuators to be in their original positions.

[0055] Specifically, the electro-hydraulic composite control method of underwater test tree and check valve of the present invention is as follows:

[0056] Emergency evacuation procedure:

[0057] S1: The underwater test tree and check valve are controlled by high-pressure hydraulic oil input through the underwater accumulator system 4 via the underwater test tree connector control line 101, the underwater test tree upper ball valve control line 102, the underwater test tree lower ball valve control line 103, and the check valve control line 104. Multiple pressure compensation lines provide pressure compensation. The I end of the shear directional valve 211 in the ground emergency control system 3 is connected to the ground control terminal 1. When the solenoid directional valve A221 is not faulty, the low-pressure hydraulic oil in the ground emergency control system pipeline passes sequentially through the solenoid directional valve A221, the III port and the IV port of the shear directional valve, and is connected to the control end of the hydraulic control directional valve C233. When the solenoid directional valve A221 fails, the pressure is increased by adding shear directional valve... The pressure at port 211Ⅰ causes the shear directional valve 211 to switch, or the pressure at port Ⅱ of the shear directional valve 211 is reduced (by energizing the solenoid directional valve E225, which controls the opening of the ball valve on the underwater test tree, causing the hydraulic directional valve A231 to switch, and the port Ⅱ of the shear directional valve is connected to seawater, causing the valve stem inside the shear directional valve to fail under tension and switch). The low-pressure hydraulic oil in the ground emergency control pipeline after these two methods is connected to port Ⅳ through port Ⅰ of the shear directional valve to control the hydraulic directional valve C233. In addition, the ground emergency control system 3 is also equipped with a hydraulic directional valve B232, so that when the ball valve control line 102 on the underwater test tree opens the ball valve, the connector control line 101 on the underwater test tree cannot unlock the connector.

[0058] S2: Open the check valve control circuit 104. The low-pressure hydraulic oil from the ground control terminal 1 is switched by the solenoid directional valve C223 to control the hydraulic directional valves E235 and F236. The high-pressure hydraulic oil is switched by the underwater accumulator group 201 to control the check valve to close through the hydraulic directional valves E235 and F236. Then the check valve control circuit 104 is closed.

[0059] S3: Open the ball valve control circuit 102 on the underwater test tree. Low-pressure hydraulic oil from the ground control terminal 1 opens the hydraulic control directional valve G237 through the solenoid directional valve E225. Then, high-pressure hydraulic oil enters the underwater test tree through the underwater accumulator group 201 and the hydraulic control directional valve G237 to open the upper ball valve. Then, close the ball valve control circuit 102 on the underwater test tree.

[0060] S4: Open the ball valve control circuit 103 of the underwater test tree. Low-pressure hydraulic oil from the ground control terminal 1 opens the hydraulic control directional valve J240 through the solenoid directional valve G227. Then, high-pressure hydraulic oil enters the underwater test tree through the underwater accumulator group 201 and the hydraulic control directional valve J240 to open the lower ball valve. Then close the ball valve control circuit 103 of the underwater test tree.

[0061] S5: Open the underwater test tree connector control circuit 101. Low-pressure hydraulic oil from the ground control terminal 1 opens the hydraulic control directional valve C233 through the solenoid directional valve A221. Then, high-pressure hydraulic oil enters the underwater test tree connector through the underwater accumulator group 201 and the hydraulic control directional valve C233 to unlock it. The unlocking line in the underwater test tree connector control circuit 101 is connected to the reset end of the hydraulic control directional valves other than the hydraulic control directional valve C233 to ensure that when the underwater test tree connector is unlocked, the other hydraulic control directional valves are in their original positions. The opening line of the hydraulic control directional valve G237 in the ball valve control circuit 102 of the underwater test tree is connected to the reset end of the hydraulic control directional valve C233 to ensure that the underwater test tree connector cannot be unlocked when the ball valve on the underwater test tree is not closed.

[0062] Reconnection steps:

[0063] S1: Open check valve control circuit 104. Low-pressure hydraulic oil from ground control terminal 1 is switched by solenoid directional valve C223 to control hydraulic directional valve E235 and hydraulic directional valve F236. High-pressure hydraulic oil is switched by underwater accumulator group 201 to control check valve opening through hydraulic directional valve E235 and hydraulic directional valve F236. Then close check valve control circuit 104.

[0064] S2: Open the ball valve control circuit 102 on the underwater test tree. Low-pressure hydraulic oil from the ground control terminal 1 passes through the solenoid directional valve F226 to open the hydraulic directional valves H238 and I239. Then, high-pressure hydraulic oil passes through the underwater accumulator group 201, through the hydraulic directional valves H238 and I239, and enters the underwater test tree to close the upper ball valve. Then, close the ball valve control circuit 102 on the underwater test tree.

[0065] S3: Open the ball valve control circuit 103 under the underwater test tree. Low-pressure hydraulic oil from the ground control terminal 1 passes through the solenoid directional valve H228 to open the hydraulic directional valve K241 and the hydraulic directional valve L242. Then, high-pressure hydraulic oil passes through the underwater accumulator group 201, through the hydraulic directional valve K241 and the hydraulic directional valve L242, and enters the underwater test tree to close the lower ball valve. Then, close the ball valve control circuit 103 under the underwater test tree.

[0066] S4: Open the underwater test tree connector control circuit 101. Low-pressure hydraulic oil from the ground control terminal 1 passes through the solenoid directional valve B222 to open the hydraulic directional valve D234. Then, high-pressure hydraulic oil passes through the underwater accumulator group 201 and enters the underwater test tree connector through the hydraulic directional valve D234 for reconnection.

[0067] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0068] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0069] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0070] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0071] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A hybrid electro-hydraulic control system for an underwater test tree and a check valve, characterized in that, include: Ground control terminal (1), umbilical cable transmission system (2), ground emergency control system (3), underwater accumulator system (4), actuator control system (5), pressure compensation control system (6), check valve (7), and underwater test tree (8).

2. The underwater test tree and check valve electro-hydraulic composite control system according to claim 1, characterized in that, The umbilical cable transmission system (2) includes an umbilical cable winch (301) and an umbilical cable (302). The ground emergency control system (3) includes a shear reversing valve (211), a hydraulic reversing valve A (231) and a hydraulic reversing valve B (232), wherein the I end of the shear reversing valve (211) is connected to the ground control terminal (1) via an umbilical cable (302), and the control ends of the hydraulic reversing valve A (231) and the hydraulic reversing valve B (232) are connected to the low-pressure control terminal line of the electromagnetic reversing valve E (225) via an umbilical cable (302); The underwater accumulator system (4) includes an underwater accumulator group (201) and an electromagnetic reversing valve D (224), wherein the underwater accumulator system (3) is connected to the actuator control system (5) via an umbilical cable (302), wherein the U port of the electromagnetic reversing valve D (224) is used for low-pressure relief. The actuator control system (5) includes an underwater test tree connector control line (101), an underwater test tree upper ball valve control line (102), an underwater test tree lower ball valve control line (103), and a check valve control line (104). The underwater test tree connector control line (101) includes an electromagnetic directional valve A (221), an electromagnetic directional valve B (222), a hydraulic directional valve C (233), and a hydraulic directional valve D (234). The electromagnetic directional valve A (221) is connected to the III end of the shear directional valve (211) via an umbilical cable (302), and the hydraulic directional valve C (233) is connected to the III end of the shear directional valve (211) via an umbilical cable (302). 02) Connected to the IV end of the shear directional valve (211) via the hydraulic directional valve B (232), wherein the umbilical cable (302) of the solenoid directional valve B (222) is connected to the control end of the hydraulic directional valve D (234), wherein the line of the hydraulic directional valve C (233) is connected to the reset end of the hydraulic directional valve other than the hydraulic directional valve C (233); the ball valve control circuit (102) on the underwater test tree includes solenoid directional valve E (225), solenoid directional valve F (226), hydraulic directional valve G (237), hydraulic directional valve H (238) and hydraulic directional valve I (239), wherein the solenoid directional valve E (225) Connected to the control terminal of the hydraulic directional valve G (237) via umbilical cable (302), wherein the solenoid directional valve F (226) is connected to the control terminals of both the hydraulic directional valve H (238) and the hydraulic directional valve I (239) via umbilical cable (302), wherein the hydraulic directional valve G (237) is connected to the reset terminal of the hydraulic directional valve C (233) via umbilical cable (302); the underwater test tree ball valve control circuit (103) includes solenoid directional valve G (227), solenoid directional valve H (228), hydraulic directional valve J (240), hydraulic directional valve K (241) and hydraulic directional valve L (240). 2), wherein the solenoid directional valve G (227) is connected to the control terminal of the hydraulic directional valve J (240) via an umbilical cable (302), wherein the solenoid directional valve H (228) is connected to the control terminals of the hydraulic directional valve K (241) and the hydraulic directional valve L (242) via an umbilical cable (302); the check valve control circuit (104) includes the solenoid directional valve C (223), the hydraulic directional valve E (235) and the hydraulic directional valve F (236), wherein the solenoid directional valve C (223) is connected to the control terminals of the hydraulic directional valve E (235) and the hydraulic directional valve F (236) via an umbilical cable (302); The pressure compensation control system (6) includes pressure compensation lines A (111), B (112), C (113), D (114), and E (115); the pressure compensation lines A, B, C, D, and E include a pressure compensator (401), a check valve (402), and a throttle valve (403), wherein the J end of the ground emergency control system (3) is connected to pressure compensation line A (111) via an umbilical cable (302), and the underwater test tree connector control... The K and L ends of the control line (101) are connected to the pressure compensation line B (112) via the umbilical cable (302). The O, P and Q ends of the ball valve control line (102) on the underwater test tree are connected to the pressure compensation line C (113) via the umbilical cable (302). The R, S and T ends of the ball valve control line (103) under the underwater test tree are connected to the pressure compensation line D (114) via the umbilical cable (302). The M and N ends of the check valve control line (104) are connected to the pressure compensation line E (115) via the umbilical cable (302).

3. The underwater test tree and check valve electro-hydraulic composite control system according to claim 2, characterized in that, The solenoid directional valves A (221) and D (224) are normally closed solenoid directional valves; the solenoid directional valves B (222), C (223), E (225), F (226), G (227), and H (228) are normally closed solenoid directional valves; the hydraulically controlled directional valves A (231) and C (233) are normally closed solenoid directional valves. Hydraulic directional valves D (234), E (235), G (237), H (238), J (240), and K (241) are normally closed hydraulic directional valves; hydraulic directional valves B (232), F (236), I (239), and L (242) are normally open hydraulic directional valves.

4. A method for electro-hydraulic combined control of an underwater test tree and a check valve, characterized in that, The underwater test tree and check valve electro-hydraulic composite control system according to any one of claims 1-3 includes the following steps: Emergency evacuation procedure: S1: The underwater test tree and check valve are controlled by the underwater test tree connector control line (101), the underwater test tree ball valve control line (102), the underwater test tree ball valve control line (103), and the check valve control line (104) through the underwater accumulator system (4) inputting high-pressure hydraulic oil. Multiple pressure compensation lines provide pressure compensation. The I end of the shear directional valve (211) in the ground emergency control system (3) is connected to the ground control terminal (1). When the electromagnetic directional valve A (221) is not faulty, the low-pressure hydraulic oil in the ground emergency control system pipeline passes through the electromagnetic directional valve A (221), the III port and the IV port of the shear directional valve in sequence, and is connected to the control end of the hydraulic control directional valve C (233). When the electromagnetic directional valve A (221) is faulty, the pressure compensation is increased by adding shear valves. The pressure at port I of the switching valve (211) causes the shear directional valve (211) to switch, or the pressure at port II of the shear directional valve (211) is reduced (by energizing the solenoid directional valve E (225) controlled by opening the ball valve on the underwater test tree, causing the hydraulic directional valve A (231) to switch, and the shear directional valve II is connected to seawater, causing the valve stem inside the shear directional valve to fail under tension and switch). The low-pressure hydraulic oil in the ground emergency control pipeline after these two methods is connected to port IV through port I of the shear directional valve to control the hydraulic directional valve C (233). In addition, the ground emergency control system (3) is also equipped with a hydraulic directional valve B (232), so that when the ball valve control line (102) on the underwater test tree opens the ball valve, the underwater test tree connector control line (101) cannot unlock the connector. S2: Open the check valve control circuit (104). Low-pressure hydraulic oil from the ground control terminal (1) controls the hydraulic directional valves E (235) and F (236) to switch through the solenoid directional valve C (223). High-pressure hydraulic oil controls the check valve to close through the hydraulic directional valves E (235) and F (236) via the underwater accumulator group (201). Then close the check valve control circuit (104). S3: Open the ball valve control circuit (102) on the underwater test tree. Low-pressure hydraulic oil from the ground control terminal (1) opens the hydraulic control directional valve G (237) through the solenoid directional valve E (225). Then, high-pressure hydraulic oil enters the underwater test tree through the hydraulic control directional valve G (237) via the underwater accumulator group (201) to open the ball valve. Then, close the ball valve control circuit (102) on the underwater test tree. S4: Open the ball valve control circuit (103) of the underwater test tree. Low-pressure hydraulic oil from the ground control terminal (1) opens the hydraulic control directional valve J (240) through the solenoid directional valve G (227). Then, high-pressure hydraulic oil enters the underwater test tree through the hydraulic control directional valve J (240) via the underwater accumulator group (201) to open the ball valve. Then, close the ball valve control circuit (103) of the underwater test tree. S5: Open the underwater test tree connector control circuit (101). Low-pressure hydraulic oil from the ground control terminal (1) opens the hydraulic control directional valve C (233) through the solenoid directional valve A (221). Then, high-pressure hydraulic oil enters the underwater test tree connector through the underwater accumulator group (201) and the hydraulic control directional valve C (233) to unlock. The unlocking line in the underwater test tree connector control circuit (101) is connected to the reset end of the hydraulic control directional valves other than the hydraulic control directional valve C (233) to ensure that when the underwater test tree connector is unlocked, the other hydraulic control directional valves are in their original positions. The opening line of the hydraulic control directional valve G (237) in the ball valve control circuit (102) of the underwater test tree is connected to the reset end of the hydraulic control directional valve C (233) to ensure that the underwater test tree connector cannot be unlocked when the ball valve on the underwater test tree is not closed. Reconnection steps: S1: Open the check valve control circuit (104). Low-pressure hydraulic oil from the ground control terminal (1) controls the hydraulic directional valves E (235) and F (236) through the solenoid directional valve C (223) to switch. High-pressure hydraulic oil controls the check valve to open through the underwater accumulator group (201) via the hydraulic directional valves E (235) and F (236). Then close the check valve control circuit (104). S2: Open the ball valve control circuit (102) on the underwater test tree. Low-pressure hydraulic oil from the ground control terminal (1) passes through the solenoid directional valve F (226) to open the hydraulic directional valve H (238) and the hydraulic directional valve I (239). Then, high-pressure hydraulic oil passes through the underwater accumulator group (201) through the hydraulic directional valve H (238) and the hydraulic directional valve I (239) to enter the underwater test tree and close the upper ball valve. Then, close the ball valve control circuit (102) on the underwater test tree. S3: Open the ball valve control circuit (103) under the underwater test tree. Low-pressure hydraulic oil from the ground control terminal (1) passes through the solenoid directional valve H (228) to open the hydraulic directional valve K (241) and the hydraulic directional valve L (242). Then, high-pressure hydraulic oil passes through the underwater accumulator group (201) and the hydraulic directional valve K (241) and the hydraulic directional valve L (242) to enter the underwater test tree and close the lower ball valve. Then, close the ball valve control circuit (103) under the underwater test tree. S4: Open the underwater test tree connector control circuit (101). Low-pressure hydraulic oil from the ground control terminal (1) opens the hydraulic control directional valve D (234) through the electromagnetic directional valve B (222). Then, high-pressure hydraulic oil enters the underwater test tree connector through the hydraulic control directional valve D (234) from the underwater accumulator group (201) for reconnection.

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