Well cementation cement setting waiting automatic pressure supplementing system

Abstract

The invention relates to the technical field of wellhead pressure equipment, in particular to an automatic pressure supplementing system for well cementation and cement setting waiting. The well cementation cement setting waiting automatic pressure supplementing system comprises an oil pressure system and a water pressure system, the oil pressure system is filled with pressure oil, and the water pressure system is filled with water; the hydraulic system comprises a water tank and a water driving pump, the input end of the water driving pump is connected with the water tank, and the output end of the water driving pump is connected to the wellhead; the oil pressure system comprises an oil tank, an output oil pump and an energy accumulator, the input end of the output oil pump is connected with the oil tank, and the output end is communicated with the wellhead. According to the automatic pressure supplementing system for well cementation and cement setting waiting, the water pressure system and the oil pressure system work in cooperation, pressurization is conducted through the water pressure system in the pressurization process, and the use amount of pressure oil in the oil pressure system is reduced; and meanwhile, an oil pressure system is switched in the pressure stabilizing process, a valve with a remote pressure regulating function on the water side does not need to be installed, and the construction cost during working is reduced.

Description

Technical Field

[0001] This invention relates to the field of wellhead pressure equipment technology, and in particular to an automatic pressure replenishment system for cementing during solidification. Background Technology

[0002] In oilfield production, to verify the pressure-holding performance of oil wells, pressure testing and pressure-holding tests are typically conducted using a wellhead pressure-holding system. This involves injecting fluid into the wellhead, maintaining pressure, and observing pressure changes to determine the well's pressure-holding capacity. Current technologies commonly use either hydraulic or hydrostatic systems to pressurize and maintain pressure at the wellhead using a single pressure medium. However, using only hydraulic systems to inject hydraulic oil into the wellhead for pressure testing and holding results in excessive operating costs because the injected oil cannot be recovered. Using hydrostatic systems to inject water into the wellhead for pressure testing and holding results in high construction costs due to the high cost and long delivery time of the remote pressure regulating valves used in hydrostatic systems. Therefore, to address these shortcomings, an automatic pressure-replenishing system for cementing during the solidification process is proposed. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an automatic pressure replenishment system for cementing after curing, which solves the problem of excessively high construction costs during wellhead pressure boosting and holding tests.

[0004] (II) Technical Solution To address the above problems, this invention provides an automatic pressure replenishment system for cementing during the cementing process, comprising: The system comprises a hydraulic system and a water pressure system, wherein the hydraulic system is filled with pressurized oil and the water pressure system is filled with water; the output ends of both the hydraulic and water pressure systems are connected to the wellhead of the oil well. The water pressure system includes a water tank and a water pump, with the input end of the water pump connected to the water tank and the output end connected to the wellhead; the hydraulic system includes an oil tank, an output oil pump, and an accumulator, with the input end of the output oil pump connected to the oil tank and the output end connected to the wellhead.

[0005] Preferably, a water pump motor is provided next to the water pump, and the output end of the water pump motor is connected to the water pump to drive the water pump to work; a pressure regulating valve, a water pressure gauge and a water check valve are provided on the pipeline connecting the output end of the water pump to the wellhead; a second pressure sensor is provided around the wellhead.

[0006] Preferably, the water tank is equipped with a water tank level gauge and a level relay. The level relay is connected to the on-site control equipment and sends an electrical signal to the control equipment according to the water level in the water tank.

[0007] Preferably, a water tank ball valve is provided at the bottom of the water tank, a water inlet is provided at the top of the water tank, and a water tank air filter is provided at the water inlet.

[0008] Preferably, the hydraulic system further includes a return oil line, the input end of which is connected to the output end of the output oil pump, and the output end of which is connected to the oil tank; the return oil line is equipped with an electromagnetic overflow valve, and the end of the return oil line is equipped with a return oil filter.

[0009] Preferably, the output end of the output oil pump is equipped with an electromagnetic reversing valve and an accumulator. The input end of the electromagnetic reversing valve is connected to the output oil pump and the return oil filter, and the output end is connected to the wellhead and the accumulator.

[0010] Preferably, an accumulator base is provided below the accumulator, and an accumulator safety valve is provided at the bottom of the accumulator.

[0011] Preferably, the pipeline between the output end of the output oil pump and the electromagnetic reversing valve is equipped with a first check valve, an oil outlet pressure gauge, and a first pressure sensor; the pipeline between the output end of the electromagnetic reversing valve and the wellhead is equipped with a pressure reducing valve and several electromagnetic shut-off valves.

[0012] Preferably, the oil tank is equipped with an oil tank level gauge and an oil drain ball valve at the bottom of the oil tank; the input end of the output oil pump extends into the oil tank and is equipped with an oil suction filter at the inlet; the oil tank is equipped with an oil filling port and an oil tank air filter at the oil filling port.

[0013] Preferably, an explosion-proof motor is provided next to the output oil pump, and the output end of the explosion-proof motor is provided with a coupling and is connected to the output oil pump through the coupling to drive the output oil pump.

[0014] (III) Beneficial Effects The automatic pressure replenishment system for cementing and waiting for cement to solidify provided by this invention works in conjunction with a hydraulic system and a hydraulic system. During the pressure boosting process, the hydraulic system is used to increase pressure, reducing the amount of pressurized oil used in the hydraulic system and greatly reducing the construction cost of the pressure replenishment work. At the same time, during the pressure stabilization process, the system switches to the hydraulic system, so that valves with remote pressure adjustment functions do not need to be installed in the hydraulic system, further reducing the construction cost of the pressure replenishment system when performing pressure boosting and pressure maintenance work at the wellhead. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the automatic pressure replenishment system for cementing under cementing conditions according to the present invention.

[0016] The components include: 1. Oil tank; 2. Drain ball valve; 3. Oil tank level gauge; 4. Suction filter; 5. Output oil pump; 6. Coupling; 7. Explosion-proof motor; 8. First check valve; 9. Solenoid relief valve; 10. Pressure gauge; 11. Oil tank air filter; 12. First pressure sensor; 13. Return oil filter; 14. Solenoid directional valve; 15. Pressure reducing valve; 16. Solenoid shut-off valve; 17. Second pressure sensor; 18. Accumulator base; 19. Accumulator; 20. Accumulator safety valve; 21. Water tank ball valve; 22. Water tank; 23. Water tank level gauge; 24. Water tank air filter; 25. Water pump motor; 26. Drive pump; 27. Pressure regulating valve; 28. Outlet water pressure gauge; 29. ​​Outlet water check valve; 30. Level relay. Detailed Implementation

[0017] 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.

[0018] In the description of this invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top", and "bottom" are based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this invention and to simplify the description. It is not intended to indicate or imply that the component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0019] like Figure 1 As shown, this invention provides an automatic pressure replenishment system for cementing wells, specifically comprising: a hydraulic system and a hydraulic system. The hydraulic system is filled with pressurized oil, and the hydraulic system is filled with water. The outputs of both systems are connected to the wellhead. The hydraulic and hydraulic systems are respectively filled with their respective liquids. During operation, the hydraulic and hydraulic systems work together, rather than using either system alone. During pressurization, the hydraulic system injects water into the wellhead to increase the wellhead pressure, and then switches to the hydraulic system to maintain the wellhead pressure, completing the pressurization and stabilization process. Using the hydraulic system during the pressurization phase significantly reduces the amount of pressurized oil used compared to the hydraulic system, thus reducing system operating costs. Simultaneously, using the hydraulic system during pressure stabilization eliminates the need for adjustable pressure remote control valves in the hydraulic system, thereby reducing the time and economic costs of the hydraulic system's operation and further improving the system's economic efficiency.

[0020] The water pressure system includes a water tank 22 and a water pump 26. The input end of the water pump 26 is connected to the water tank 22, and the output end is connected to the wellhead. The water tank 22 serves as the main body of the water pressure system and is mainly used to store the water needed during the operation. The water pump 26 serves as the power source within the water pressure system. The water pump 26 injects the water in the water tank 22 into the wellhead, which is the experimental target, through the pipeline. At the same time, the water pump 26 can pressurize the water at the wellhead to meet the pressure requirements for pressurization.

[0021] The water tank 22 is equipped with a water level gauge 23 and a level relay 30. The level relay 30 is connected to the on-site control equipment and sends an electrical signal to the control equipment based on the water level in the water tank 22. The water level gauge 23 measures the water level in the water tank 22 to determine the water volume. By monitoring the reading of the water level gauge 23, staff can monitor the water volume in the water tank 22 in real time and replenish water as needed. The level relay 30 is installed inside the water tank 22. The activation level of the level relay 30 can be changed by setting it. When the water level in the water tank 22 reaches the activation level, the level relay 30 activates and sends an activation electrical signal. Connecting the level relay 30 to the on-site alarm device allows for a level alarm to be triggered when the water level in the water tank 22 reaches a dangerous level, serving as a warning and reminder to staff and prompting them to adjust the water level in the water tank 22 in a timely manner. In practical applications, the liquid level relay 30 includes various models such as float type, electrode type, and ultrasonic type. Operators can select the appropriate model and working method of liquid level relay 30 according to their work needs and the on-site working environment, thereby improving the applicability of the device.

[0022] To facilitate the injection and outflow of liquid from the inner wall of the water tank 22, a water tank ball valve 21 is provided at the bottom of the water tank 22, and a water inlet is provided at the top of the water tank, with a water tank air filter 24 installed at the water inlet. When the water tank 22 needs to be replenished, the output end of the water replenishment device is connected to the water inlet to replenish the water tank 22. As water enters the water tank 22 from the water inlet, the water entering the water tank 22 also flows through the water tank air filter 24. The water tank air filter 24 filters the flowing water, removing solid impurities such as dust from the water, thereby ensuring the cleanliness of the water flowing into the water tank 22 from the water inlet. Furthermore, during the water delivery process, if the water tank 22 remains sealed, the pressure inside the tank will gradually decrease as the water level drops, making it difficult for the water pump 26 to deliver water and affecting the wellhead pressurization efficiency. At this point, opening the water tank air filter 24 allows water to be delivered into the tank 22 through the water inlet while water is being delivered externally, or allows surrounding air to enter the tank 22 after passing through the air filter 24, balancing the pressure inside the tank and maintaining its stability. When the water level in the tank 22 is too high or after the work is completed, the water in the tank 22 needs to be drained. One end of the water tank ball valve 21 is connected to the water tank 22, and the other end is usually connected to the on-site drainage system. Opening the water tank ball valve 21 allows the water in the tank 22 to be drained.

[0023] It should be noted that a water pump motor 25 is provided next to the water pump 26, and the output end of the water pump motor 25 is connected to the water pump 26 to drive the water pump 26 to work; a pressure regulating valve 27, a water pressure gauge 28, and a water one-way valve 29 are provided on the pipeline connecting the output end of the water pump 26 to the wellhead; a second pressure sensor 17 is provided around the wellhead. The water pump motor 25 serves as the power source for the water pump 26, providing stable power to ensure the stable operation of the water pump 26. During the process of pressurizing water to the wellhead, in order to maintain the stability of the pressure in the pipeline, the pressure in the pipeline at the output end of the water pump 26 is adjusted by the pressure regulating valve 27. When the water pressure is higher than the set pressure, the pressure regulating valve 27 opens, allowing some water to flow out from the pressure regulating valve 27, thereby reducing the pressure of the water output from the water pump 26 and maintaining the pressure balance in the pipeline. After the water pump 26 completes the pressurization work at the wellhead, it is necessary to stop the operation of the water pump 26 and switch to the hydraulic system to maintain the pressure at the wellhead. To prevent water from flowing back into the water pump 26 and water tank 22 through the pipeline, a one-way valve 29 is installed on the pipeline. This ensures that water can only flow from the output end of the water pump 26 to the wellhead within the pipeline, preventing water diversion within the pipeline and maintaining the stability of the system. The outlet pressure gauge 28 is mainly used to monitor the output water pressure of the water pump 26. Operators can determine the operating status of the water pump 26 by reading the reading of the outlet pressure gauge 28. The second pressure sensor 17 is mainly used to monitor the liquid pressure at the wellhead. By analyzing the electrical signal and reading sent by the second pressure sensor 17, the liquid pressure at the wellhead can be determined, allowing operators to promptly address any faults or proceed with further operations.

[0024] In this invention, the hydraulic system includes an oil tank 1, an output oil pump 5, and an accumulator 19. The input end of the output oil pump 5 is connected to the oil tank 1, and the output end is connected to the wellhead. The oil tank 1, as the main body of the hydraulic system, is mainly used to store the pressurized oil required for pressure maintenance. The output oil pump 5 is used to output the pressurized oil in the oil tank 1 to the wellhead for pressure maintenance. The main function of the accumulator 19 is to maintain the stability of the pressure in the oil circuit. After the output oil pump 5 starts, a portion of the pressurized oil is output into the accumulator 19. At this time, the pressure in the accumulator 19 is consistent with the pressure in the oil pipeline. When the output oil pump 5 fails, the pipeline leaks, or other reasons cause the pressure in the oil pipeline to drop, the accumulator 19 will output the oil stored inside to the oil pipeline to maintain the pressure of the oil in the pipeline stable for a short period of time, giving the staff time to handle the fault.

[0025] The hydraulic system also includes a return oil line. The input end of the return oil line is connected to the output end of the output oil pump 5, and the output end of the return oil line is connected to the oil tank 1. An electromagnetic overflow valve 9 is installed on the return oil line, and a return oil filter 13 is installed at the end of the return oil line. Similar to the water pressure system, when the output pressure of the output oil pump 5 exceeds the set pressure oil output pressure, it is necessary to reduce the pressure in the pipeline by discharging some of the pressurized oil from the delivery pipeline. However, since pressurized oil is expensive, direct discharge would result in significant waste. Therefore, the pressurized oil discharged from the delivery pipeline is redirected back to the oil tank 1 via the return oil line. When the pressure in the delivery pipeline exceeds the set value, the electromagnetic overflow valve 9 on the return oil line opens, allowing some pressurized oil to enter the return oil line and flow back to the oil tank 1. Before entering the oil tank, the oil passes through the return oil filter 13 at the end of the return oil line, which filters the oil to prevent contamination of the oil in the oil tank 1.

[0026] The output pump 5 is equipped with an electromagnetic directional valve 14 and an accumulator 19 at its output end. The input end of the electromagnetic directional valve 14 is connected to the output pump 5 and the return oil filter 13, while its output end is connected to the wellhead and the accumulator 19. The electromagnetic directional valve 14 is located between the wellhead and the output pump 5 and is used to switch the flow direction of pressurized oil in the pipeline. Commonly used electromagnetic directional valves 14 have two pathways: one connects the wellhead pipeline to the output pipeline of the output pump 5, and the other connects the wellhead pipeline to the return oil pipeline. During operation, the operator can change the connection state of the electromagnetic directional valve 14 by sending an electrical signal. Since the accumulator 19's primary function in maintaining pipeline pressure in the hydraulic system is to maintain stable pressure at the wellhead to ensure smooth pressure holding, its input pipeline is usually connected to the oil pipeline near the wellhead. During the pressure holding process, the wellhead is connected to the output oil pump 5 by adjusting the solenoid directional valve 14, and the pressure at the wellhead is maintained by the output oil pump 5. After the pressure holding process is completed, the pressure oil at the wellhead is recovered to the oil tank 1 by adjusting the solenoid directional valve 14 to connect the wellhead to the return oil pipeline.

[0027] To maintain the stability of the accumulator 19, an accumulator base 18 is typically provided below the accumulator 19, and an accumulator safety valve 20 is provided at the bottom of the accumulator 19. The accumulator base 18 secures the position of the accumulator 19 and maintains its stability. When the pressure inside the accumulator 19 continuously increases due to equipment failure or other reasons, or when it is necessary to drain the pressurized oil inside the accumulator 19, the safety valve 20 can be opened to drain the oil from the accumulator 19.

[0028] It should be noted that a first check valve 8, an oil pressure gauge 10, and a first pressure sensor 12 are installed on the pipeline between the output end of the output oil pump 5 and the electromagnetic directional valve 14; a pressure reducing valve 15 and several electromagnetic shut-off valves 16 are installed on the pipeline between the output end of the electromagnetic directional valve 14 and the wellhead. The first check valve 8 is mainly used to prevent the pressurized oil in the pipeline at the output end of the output oil pump 5 from flowing along the pipeline, thus avoiding damage to the output oil pump 5. Several electromagnetic shut-off valves 16 are installed on the pipeline between the electromagnetic directional valve 14 and the wellhead to prevent the pressurized oil at the wellhead from flowing back along the pipeline, causing the wellhead pressure to drop before the pressure holding work is completed. The electromagnetic shut-off valve 16 is generally controlled by an electrical signal. Under normal circumstances, the inside is open, and after receiving an electrical signal, it blocks the inside to prevent liquid from passing through. The oil pressure gauge 10 and the first pressure sensor 12 are mainly used to monitor the oil pressure in the output pipeline, so that the operator can judge the pressure in the oil pipeline based on the reading of the oil pressure gauge 10 and the electrical signal transmitted by the first pressure sensor 12.

[0029] Normally, on the oil pipeline at the output end of the output oil pump 5, the connection point between the accumulator 19 and the oil pipeline is located between the electromagnetic shut-off valve 16 and the wellhead. This allows the electromagnetic shut-off valve 16 to close in case of a hydraulic system failure, ensuring that all the oil pressure in the accumulator 19 acts on the wellhead, maintaining stable wellhead pressure. To prevent water from flowing into the accumulator 19 during water injection to increase pressure and contaminate the oil inside, an additional electromagnetic shut-off valve 16 is typically installed on the oil pipeline between the connection point of the accumulator 19 and the wellhead. When the hydraulic system is operating, energizing the electromagnetic shut-off valve 16 above the accumulator 19 closes it, cutting off the passage between the accumulator 19 and the wellhead, preventing water from the wellhead from flowing down the oil pipeline into the accumulator 19 or other hydraulic system equipment.

[0030] In addition, the oil tank 1 is equipped with an oil tank level gauge 3, and an oil drain ball valve 2 is located at the bottom of the oil tank 1; the input end of the output oil pump 5 extends into the oil tank 1 and is equipped with an oil suction filter 4 at the inlet; the oil tank 1 is equipped with an oil filling port, and an oil tank air filter 11 is located at the oil filling port. The oil tank level gauge 3 is mainly used to monitor the oil level in the oil tank 1. During the operation of the output oil pump 5, the oil in the oil tank 1 is first filtered by the oil suction filter 4 before entering the output oil pump 5 to prevent damage to the output oil pump 5. Similar to the function of the water filling port and water tank air filter 24 on the water tank 22, the oil tank air filter 11 is mainly used to filter the air and oil entering the oil tank 1 to prevent impurities from entering the oil tank 1 and contaminating the oil. When the oil tank 1 needs to be drained, the oil can be drained by opening the oil drain ball valve 2 at the bottom.

[0031] In addition, an explosion-proof motor 7 is provided next to the output oil pump 5. The output end of the explosion-proof motor 7 is equipped with a coupling 6, which connects to the output oil pump 5 to drive it. The explosion-proof motor 7 is the power source for the output oil pump 5, driving it to rotate. Connecting the output end of the explosion-proof motor 7 to the output oil pump 5 via the coupling 6 maintains a stable transmission relationship between the output oil pump 5 and the explosion-proof motor 7, improving the stability of the device's operation.

[0032] To prevent water from flowing into the hydraulic system from the wellhead during pressurization, a shut-off valve is typically installed between the wellhead and the hydraulic system. This shut-off valve is located at the end of the oil pipeline at the wellhead. When energized, the shut-off valve is closed, sealing the wellhead and oil pipeline to prevent water from flowing into the hydraulic system. When the system enters pressure stabilization mode, the hydraulic system, through the output oil pump 5, increases the pressure in the oil pipeline to the set value. At this point, the shut-off valve is de-energized and opens, allowing the pressure within the hydraulic system to be applied to the wellhead, thus achieving pressure stabilization.

[0033] In this invention, in order to reduce the difficulty of operation and improve the intelligence of the device, the various devices in the system that can be controlled by electrical signals are usually integrated into a control panel. The control panel can be a computer device or a touch panel with a built-in processor. By programming in the control panel, the components can be interlocked for control. That is, when a certain value reaches the set value, some devices will automatically operate according to the set working state and process, thereby reducing the workload of the staff and improving the response speed of the system. For example, when the second pressure sensor 17 measures that the wellhead pressure reaches the set pressure value for boosting operation, the output oil pump 5 in the hydraulic system will automatically start running to deliver the oil in the oil tank 1 to the wellhead.

[0034] The automatic pressure replenishment system for cementing during the cementing process provided by this invention can significantly reduce the construction cost of pressure boosting and maintaining during cementing. The specific operation process of this device is as follows: Step 1: Install the device at the wellhead location according to the device structure and connect all the pipes.

[0035] Step 2: Start the water pump to inject water from the tank into the wellhead. At this time, under the action of the water pump, the water in the tank gradually accumulates at the wellhead, causing the pressure at the wellhead to gradually rise. At the same time as the water pump starts, power is supplied to the electromagnetic shut-off valve above the accumulator to isolate the wellhead from the hydraulic system.

[0036] Step 3: When the wellhead pressure reaches the set pressure, start the output oil pump. At this time, the pressure at the wellhead reaches the upper limit of the water pressure during the pressurization operation. Start the output oil pump to introduce the pressurized oil in the oil tank into the oil pipeline. The pressurized oil flows into the accumulator along the oil pipeline, causing the oil pressure in the accumulator and the oil pipeline to gradually increase to the target oil pressure.

[0037] Step 4: Open the solenoid shut-off valve to pressurize the wellhead with pressurized oil. During this process, the solenoid shut-off valve is de-energized and opens, allowing the oil in the pipeline to flow to the wellhead and apply pressure. As the pressure at the inlet of the output oil pump gradually rises to the holding pressure, the pressure increases.

[0038] Step 5: Maintain wellhead pressure until the wellhead holding time is reached. During this process, the wellhead pressure remains constant under the action of the output oil pump and the return oil pipeline. When the wellhead pressure remains constant after the predetermined holding time, the pressure holding operation ends. If the inlet pressure continues to drop during the wellhead pressure holding operation and the oil pressure continues to drop after the output oil pump is started, it indicates that there is a wellhead leak. When the wellhead pressure value is lower than the upper limit of the water pressure, the oil pressure system is shut down and the water pressure system is started. Repeat steps one to five above to re-pressurize.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic pressure replenishment system for cementing during curing, characterized in that, include: The system comprises an oil pressure system and a water pressure system. The oil pressure system is filled with pressurized oil, and the water pressure system is filled with water. The output ends of both the oil pressure system and the water pressure system are connected to the wellhead. The water pressure system includes a water tank (22) and a water pump (26). The input end of the water pump (26) is connected to the water tank (22), and the output end is connected to the wellhead. The oil pressure system includes an oil tank (1), an output oil pump (5), and an accumulator (19). The input end of the output oil pump (5) is connected to the oil tank (1), and the output end is connected to the wellhead.

2. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 1, characterized in that, A water pump motor (25) is provided next to the water pump (26). The output end of the water pump motor (25) is connected to the water pump (26) to drive the water pump (26) to work. A pressure regulating valve (27), a water pressure gauge (28) and a water check valve (29) are provided on the pipeline connecting the output end of the water pump (26) to the wellhead. A second pressure sensor (17) is provided around the wellhead.

3. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 1, characterized in that, The water tank (22) is equipped with a water tank level gauge (23) and a level relay (30). The level relay (30) is connected to the control equipment on site and sends an electrical signal to the control equipment according to the liquid level in the water tank (26).

4. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 1, characterized in that, The water tank (26) is provided with a water tank ball valve (21) below it and a water inlet above it. The water inlet is provided with a water tank air filter (24).

5. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 1, characterized in that, The hydraulic system also includes a return oil line, the input end of which is connected to the output end of the output oil pump (5), and the output end of which is connected to the oil tank (1); the return oil line is equipped with an electromagnetic overflow valve (9), and the end of the return oil line is equipped with a return oil filter (13).

6. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 5, characterized in that, The output end of the output oil pump (5) is equipped with an electromagnetic reversing valve (14) and an accumulator (19). The input end of the electromagnetic reversing valve (14) is connected to the output oil pump (5) and the return oil filter (13), and the output end is connected to the wellhead and the accumulator (19).

7. The automatic pressure replenishment system for cementing under conditions of settling according to claim 6, characterized in that, An accumulator base (18) is provided below the accumulator (19), and an accumulator safety valve (20) is provided at the bottom of the accumulator (19).

8. The automatic pressure replenishment system for cementing under conditions of settling according to claim 5, characterized in that, The pipeline between the output end of the output oil pump (5) and the electromagnetic reversing valve (14) is equipped with a first check valve (8), an oil pressure gauge (10), and a first pressure sensor (12); the pipeline between the output end of the electromagnetic reversing valve (14) and the wellhead is equipped with a pressure reducing valve (15) and several electromagnetic shut-off valves (16).

9. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 1, characterized in that, The oil tank (1) is equipped with an oil tank level gauge (3) and an oil drain ball valve (2) at the bottom of the oil tank (1); the input end of the output oil pump (5) extends into the oil tank (1) and is equipped with an oil suction filter (4) at the inlet; the oil tank (1) is equipped with an oil filling port and an oil tank air filter (11) is provided at the oil filling port.

10. The automatic pressure replenishment system for cementing under conditions of condensation according to claim 1, characterized in that, An explosion-proof motor (7) is provided next to the output oil pump (5). The output end of the explosion-proof motor (7) is provided with a coupling (6) and is connected to the output oil pump (5) through the coupling (6) to drive the output oil pump (5).

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