Small hydraulic system using electromagnetic valve for pressure control

Abstract

The invention relates to the technical field of oil field hydraulic systems, in particular to a small hydraulic system for pressure control through an electromagnetic valve. The system comprises a motor used for driving a hydraulic system to work; the one-way valve is used for controlling the flowing direction of the hydraulic system; the temperature sensor is used for monitoring the temperature change of the hydraulic system; the pressure difference sensor is used for detecting the pressure difference in the hydraulic system; the oil path is used for conveying a hydraulic medium into the hydraulic module; the piston type oil tank is used for storing a hydraulic medium and connected with the hydraulic module, and the safety valve can be automatically opened when the internal pressure of the system exceeds the designed pressure or a set threshold value; the hydraulic pump is used for generating hydraulic thrust; and the electromagnetic valve is used for controlling the opening and closing of the hydraulic system and controlling the opening and closing of the electromagnetic valve through the on-off of a control line. According to the invention, a motor is not needed to control the thrust, the power-off work of the hydraulic module is realized, and the underground working time is shortened. The service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield hydraulic systems, and particularly to a small hydraulic system that uses a solenoid valve for pressure control. Background Art

[0002] With the in-depth exploration and development of the Daqing Oilfield, the development focus has gradually shifted from the interior of the Changyuan to the peripheral thin and poor oil layers. There are many faults and thin layers in the peripheral oil layers. Using vertical wells for development results in low production efficiency, and only special well types such as horizontal wells, extended reach wells, and multilateral wells can be used for development. However, compared with foreign technical levels, the current drilling of special wells in the Daqing Oilfield mainly has problems such as slow drilling speed and weak displacement extension ability, and there is an urgent need to improve the construction technology of horizontal wells. Using a rotary steerable tool for construction can not only solve the above problems, but also greatly increase the length of the horizontal section and improve the development efficiency of a single well. The rotary steerable drilling tool consists of mechanical components, an electronic circuit system, a hydraulic module, etc. The small hydraulic system is the key execution component of this tool. Its external dimensions are small, but it needs to provide a pushing force of 2 tons to achieve precise control of the wellbore trajectory. The hydraulic module is the main thrust-providing component of the rotary steerable system, and each rotary steerable system consists of three hydraulic modules. It is an integrated hydraulic device that converts electrical energy into internal energy and finally provides thrust. It consists of a DC oil-immersed motor, a micro hydraulic pump, etc.

[0003] However, the hydraulic module without a solenoid valve must ensure continuous rotation of the motor to provide continuous thrust. However, each drilling operation needs to work continuously for 100 - 200 hours. Each hydraulic module needs to be disassembled, repaired, and replaced with accessories after serving 2 - 3 wells. The long-term power-on operation causes relatively large losses to its components and high costs. Therefore, those skilled in the art have proposed a small hydraulic system that uses a solenoid valve for pressure control to solve the above problems. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a small hydraulic system that uses a solenoid valve for pressure control, and solves the problem in the prior art that the hydraulic module without a solenoid valve needs to be powered on for a long time, resulting in relatively large losses to its components and high costs.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A small hydraulic system that uses a solenoid valve for pressure control, comprising: A motor for driving the hydraulic system to work; A check valve for controlling the flow direction of the hydraulic system; A temperature sensor for monitoring the temperature change of the hydraulic system; A differential pressure sensor for detecting the pressure difference in the hydraulic system; An oil circuit for transporting hydraulic medium to the hydraulic module; A piston-type oil tank for storing hydraulic medium and connected to a hydraulic module; A safety valve that automatically opens when the internal pressure of the system exceeds the design pressure or set threshold, allowing excess hydraulic oil to flow out of the system to prevent the system from being damaged or having an accident due to overload; A hydraulic pump for generating hydraulic thrust; A solenoid valve for controlling the opening and closing of the hydraulic system. By energizing and de-energizing the control line, the valve that controls its opening and closing is realized. The pressure holding after the hydraulic module is powered off is achieved.

[0006] Preferably, it further includes an oil pump mounting nozzle through which the hydraulic pump injects hydraulic medium into the system.

[0007] Preferably, it further includes a first valve group mounting hole for mounting the valves of the first valve group, and the check valve is fixedly connected inside the first valve group mounting hole.

[0008] Preferably, it further includes a second valve group mounting hole, and the differential pressure sensor is fixedly connected inside the second valve group mounting hole.

[0009] Preferably, the oil circuit connects the hydraulic pump, the first valve group and other hydraulic components to ensure the flow and transmission of the hydraulic medium.

[0010] Preferably, both the motor and the hydraulic pump are remotely controlled by a controller.

[0011] A method of using a small hydraulic system that applies a solenoid valve for pressure control, including the following steps: Step 1: When the solenoid valve is not working, it is in the normally open state to ensure the return of hydraulic oil to prevent sticking of the drill. After going down the well, the motor is powered on and started, and the solenoid valve is energized and closed. At this time, the motor drives the hydraulic pump to output high-pressure oil externally. The high-pressure oil passes through the check valve and enters the high-pressure chamber of the system, pushing the piston inside the piston-type oil tank to extend outwards, thereby pushing the wing ribs against the well wall and applying a guiding force to the drill bit. Step 2: When the predetermined pressure is reached, the controller controls the motor to stop. At this time, the high-pressure oil will be sealed in the high-pressure area, and the wing ribs are in the extended state, making the guiding head in the eccentric centralizer state to achieve the guiding purpose. When the system pressure reaches the opening pressure of the safety valve, the system will unload to the oil tank to achieve the purpose of stabilizing the system pressure and protecting the system safety. The differential pressure sensor monitors the system working pressure in real time to provide a target signal for the guiding vector closed-loop monitoring. When the hydraulic system needs to change from a high-pressure state to a low-pressure state, first cut off the power of the electromagnetic switch valve to relieve the pressure of the system, then energize the electromagnetic switch valve, and then control the motor to drive the oil pump to supply oil to the high-pressure system. Stop after reaching the target pressure.

[0012] The present invention provides a small hydraulic system that uses a solenoid valve for pressure control. It has the following beneficial effects: After the hydraulic module of the present invention reaches the predetermined thrust, the solenoid valve is in the closed state, the motor can stop, the pressure of the hydraulic module will not decrease, and it enters the state of pressure-holding drilling. When the target thrust is less than the actual thrust, controlling the instantaneous opening and then closing of the solenoid valve can achieve the pressure relief function to reduce the thrust. There is no need to control the thrust size by the motor, realizing the power-off operation of the hydraulic module, reducing the downhole working time and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the schematic diagram of the hydraulic system of the present invention; Figure 2 is the sectional view of the product of the present invention.

[0014] Among them, 1, safety valve; 2, first valve group mounting hole; 3, differential pressure sensor; 4, temperature sensor; 5, solenoid valve; 6, second valve group mounting hole; 7, oil circuit; 8, check valve; 9, oil pump mounting nozzle; 10, motor; 11, piston-type fuel tank; 12, hydraulic pump. EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0016] Please refer to the attached Figure 1 -attached Figure 2 , the embodiment of the present invention provides a small hydraulic system that uses a solenoid valve for pressure control, including: A motor 10 for driving the hydraulic system to work; A check valve 8 for controlling the flow direction of the hydraulic system; A temperature sensor 4 for monitoring the temperature change of the hydraulic system; Specifically, the temperature sensor 4 is usually installed in the hydraulic system to monitor the temperature change of the hydraulic system. It can sense the temperature by connecting to the pipeline or fuel tank of the system. The function of the temperature sensor 4 is to monitor the temperature of the hydraulic system in real time and feed back the temperature data to the control system or operator. The main functions include: Providing temperature information: The temperature sensor 4 can measure the liquid temperature in the hydraulic system and provide real-time temperature data.

[0017] Early warning and protection: When the temperature exceeds the set safe range, the temperature sensor 4 can trigger an alarm or take corresponding control measures to avoid system failures or damages caused by overheating.

[0018] System optimization: By monitoring temperature changes, it can help adjust the operating parameters of the hydraulic system to keep the system working within an appropriate temperature range, improving the system's efficiency and reliability.

[0019] Differential pressure sensor 5, used to detect the pressure difference in the hydraulic system; Specifically, the differential pressure sensor 5 is used to detect the pressure difference in the hydraulic system. It provides information about the state of the hydraulic system by measuring the pressure difference between different points. The functions of the differential pressure sensor 5 include: Pressure monitoring: The differential pressure sensor 5 can measure the pressure difference between two positions in the hydraulic system to provide the pressure state of the hydraulic system.

[0020] System protection: When an abnormal pressure difference appears in the hydraulic system, the differential pressure sensor 5 can trigger an alarm or take corresponding control measures to avoid system overload or damage.

[0021] Flow control: By monitoring the pressure difference, the differential pressure sensor 5 can help adjust the valves and flow control devices in the hydraulic system to achieve the required thrust and flow rate.

[0022] Fault diagnosis: By comparing the pressure differences at different positions, the differential pressure sensor 5 can help detect possible faults or leaks in the system and provide fault diagnosis information Oil circuit 7, used to convey hydraulic media such as oil to the hydraulic module; Piston-type oil tank 11, used to store hydraulic media and is connected to the hydraulic module; Safety valve 1, when the internal pressure of the system exceeds the design pressure or set threshold, it will automatically open and discharge the excess hydraulic oil from the system, thus preventing the system from being damaged due to overload or accidents. Hydraulic pump 12, used to generate hydraulic thrust; Solenoid valve 5, used to control the opening and closing of the hydraulic system. By controlling the on-off of the control wire, it controls the opening and closing of the valve, achieving pressure maintenance after the hydraulic module is powered off.

[0023] It also includes an oil pump mounting nozzle 9. The hydraulic pump 12 injects hydraulic media into the system through the oil pump mounting nozzle 9.

[0024] It also includes a first valve group mounting hole 2, used to install the valves of the first valve group. The check valve 8 is fixedly connected inside the first valve group mounting hole 2.

[0025] Specifically, this design enables the first valve group to effectively control the flow direction of the hydraulic medium, ensuring the stability and reliability of the hydraulic system.

[0026] It also includes a second valve group mounting hole 6, and the differential pressure sensor 5 is fixedly connected inside the second valve group mounting hole 6.

[0027] Specifically, this design enables the differential pressure sensor to accurately measure the pressure difference at two different positions in the hydraulic system, thus providing important feedback information for the stable operation of the hydraulic system.

[0028] The oil circuit 7 connects the hydraulic pump 12, the first valve group and other hydraulic components to ensure the flow and transmission of the hydraulic medium.

[0029] Specifically, this design enables the hydraulic medium to flow smoothly throughout the hydraulic system and can accurately transmit hydraulic signals and power, thus ensuring the normal operation of the hydraulic system.

[0030] Both the motor 10 and the hydraulic pump 12 are remotely controlled by the controller Both the motor 10 and the hydraulic pump 12 are remotely controlled by the controller, which means they can be operated and monitored through remote devices or systems. This way of remote control enables the operator to operate the motor 10 and the hydraulic pump 12 away from the equipment, thus improving the safety and efficiency of the operation.

[0031] In addition, the controller can also precisely control the motor 10 and the hydraulic pump 12 to ensure their stability and reliability during operation. The controller can control the operating states of the motor 10 and the hydraulic pump 12 by receiving instructions from remote devices, thus achieving efficient control of the equipment.

[0032] In addition, since both the motor 10 and the hydraulic pump 12 are remotely controlled by the controller, this also means that the operator can conduct real-time monitoring and adjustment during the operation of the equipment. If the equipment fails or malfunctions, the controller can immediately receive the alarm signal from the equipment and take corresponding measures to handle it, thus ensuring the safety and stability of the equipment.

[0033] A method of using a small hydraulic system that applies a solenoid valve for pressure control includes the following steps: Step 1: When the solenoid valve 5 is not working, it is in the normally open state to ensure the return of the hydraulic oil and prevent sticking of the drill. After going down the well, the motor 10 is powered on and started, and the solenoid valve 5 is energized and closed. At this time, the motor 10 drives the hydraulic pump 12 to output high-pressure oil externally. The high-pressure oil enters the high-pressure cavity of the system through the check valve 8, pushing the piston inside the piston-type oil tank 11 to extend outwards, thereby pushing the wing ribs to lean against the well wall and applying a guiding force to the drill bit. Step 2: When the preset pressure is reached, the controller controls the motor 10 to stop. At this time, the high-pressure hydraulic fluid will be enclosed in the high-pressure area, and the wing rib is in the extended state, making the guide head in the eccentric centralizer state to achieve the guiding purpose. When the system pressure reaches the opening pressure of the safety valve 1, the system will unload to the oil tank to stabilize the system pressure and protect the system safety. The differential pressure sensor 3 monitors the system working pressure in real time to provide target signal monitoring for the guiding vector closed-loop. When the hydraulic system needs to change from the high-pressure state to the low-pressure state, first cut off the power of the electromagnetic switch valve to relieve the system pressure, then turn on the power of the electromagnetic switch valve, and then control the motor 10 to drive the oil pump to supply oil to the high-pressure system. Stop after reaching the target pressure.

[0034] Specifically, after the hydraulic module adopted by the present invention reaches the preset thrust, the solenoid valve 5 is in the closed state, and the motor 10 can stop. The pressure of the hydraulic module will not decrease, and it enters the state of pressure-holding drilling. When the target thrust is less than the actual thrust, controlling the instantaneous opening and closing of the solenoid valve 5 can achieve the pressure-relief function to reduce the thrust. There is no need for the motor 10 to control the magnitude of the thrust, realizing the power-off operation of the hydraulic module, reducing the downhole working time and extending the service life.

[0035] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small hydraulic system for pressure control using a solenoid valve, characterized in that, it includes: A motor (10) for driving the hydraulic system to work; A check valve (8) for controlling the flow direction of the hydraulic system; A temperature sensor (4) for monitoring the temperature change of the hydraulic system; A differential pressure sensor (5) for detecting the pressure difference in the hydraulic system; An oil circuit (7) for delivering a hydraulic medium (such as oil) to a hydraulic module; A piston-type oil tank (11) for storing the hydraulic medium and connected to the hydraulic module; A safety valve (1) which will automatically open when the internal pressure of the system exceeds the design pressure or a set threshold, allowing the excess hydraulic oil to flow out of the system, thereby preventing the system from being damaged or having an accident due to overload; A hydraulic pump (12) for generating hydraulic thrust; A solenoid valve (5) for controlling the opening and closing of the hydraulic system. By controlling the power on and off of the control line, the valve that opens and closes is controlled, achieving pressure maintenance after the hydraulic module is powered off.

2. A small hydraulic system for pressure control using a solenoid valve according to claim 1, characterized in that, it further includes an oil pump mounting nozzle (9), and the hydraulic pump (12) injects the hydraulic medium into the system through the oil pump mounting nozzle (9).

3. A small hydraulic system for pressure control using a solenoid valve according to claim 1, characterized in that, it further includes a first valve group mounting hole (2) for mounting the valves of the first valve group, and the check valve (8) is fixedly connected inside the first valve group mounting hole (2).

4. A small hydraulic system for pressure control using a solenoid valve according to claim 1, characterized in that, it further includes a second valve group mounting hole (6), and the differential pressure sensor (5) is fixedly connected inside the second valve group mounting hole (6).

5. A small hydraulic system for pressure control using a solenoid valve according to claim 1, characterized in that, the oil circuit (7) connects the hydraulic pump (12), the first valve group and other hydraulic components to ensure the flow and transmission of the hydraulic medium.

6. A small hydraulic system for pressure control using a solenoid valve according to claim 1, characterized in that, both the motor (10) and the hydraulic pump (12) are remotely controlled by a controller.

7. A method for using a small hydraulic system for pressure control using a solenoid valve, applying a small hydraulic system for pressure control using a solenoid valve according to any one of claims 1-6, characterized in that, it includes the following steps: Step 1: When the solenoid valve (5) is not working, it is in an open state to ensure the return of the hydraulic oil to prevent sticking of the drill. After going down the well, the motor (10) is powered on and started, and the solenoid valve (5) is powered on and closed. At this time, the motor (10) drives the hydraulic pump (12) to output high-pressure oil. The high-pressure oil enters the high-pressure chamber of the system through the check valve (8), pushing the piston inside the piston-type oil tank (11) to extend outwards, thereby pushing the wing ribs against the well wall and applying a guiding force to the drill bit; Step 2: When the predetermined pressure is reached, the controller controls the motor (10) to stop. At this time, the high-pressure hydraulic oil will be sealed in the high-pressure area, and the wing rib is in the extended state, making the guide head in the eccentric centralizer state to achieve the guiding purpose. When the system pressure reaches the opening pressure of the safety valve (1), the system will unload to the oil tank to stabilize the system pressure and protect the system safety. The differential pressure sensor (3) monitors the system working pressure in real time to provide target signal monitoring for the guiding vector closed-loop. When the hydraulic system needs to change from the high-pressure state to the low-pressure state, first cut off the power of the electromagnetic switch valve to relieve the system pressure, then turn on the power of the electromagnetic switch valve, and then control the motor (10) to drive the oil pump to supply oil to the high-pressure system. After reaching the target pressure, stop the machine.

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