Stepless variable-diameter stabilizer combining electric control system and hydraulic control system

Abstract

The invention provides a stepless variable-diameter stabilizer combining an electric control system and a hydraulic control system. The stepless variable-diameter stabilizer combining the electric control system and the hydraulic control system comprises a mechanical structure and a hydraulic control structure, the mechanical structure comprises a stabilizer shell, an upper connector arranged on the stabilizer shell, a lower connector arranged on the stabilizer shell, an axial wedge face body, a telescopic palm, a driven rod, a torque conversion system, a hydraulic system, a first bearing, a second bearing and a stabilizer sleeve arranged on the outer side of the first bearing. According to the stepless variable-diameter stabilizer combining the electric control system and the hydraulic control system, through cooperative work of the DSP microprocessor, the displacement sensor and the pressure sensor, high-precision real-time diameter adjustment is achieved, and the stepless variable-diameter stabilizer can meet the requirements of different well conditions. The hydraulic control system serves as a standby scheme of the electric control system, when the electric control system fails due to underground disturbance or hardware faults, control can be automatically taken over, and it is ensured that the basic functions of the stabilizer are not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling equipment, and specifically to a continuously variable diameter stabilizer combining an electric control system and a hydraulic control system. Background Art

[0002] As a core tool in modern drilling technology, variable diameter stabilizers are widely used in drilling operations in deep wells, high-temperature and high-pressure formations, and complex formations. Existing variable diameter stabilizers are mainly divided into two types: mechanical and electro-hydraulic. The mechanical stabilizer controls the expansion and contraction of the blades through multiple-stage chutes or fixed inclined planes to achieve diameter adjustment. It has a simple structure but poor flexibility and is difficult to meet the high-precision requirements of complex wellbores. The electro-hydraulic stabilizer combines a hydraulic system and an electric control system. By adjusting the pressure difference on both sides of the blades in real time, it can precisely control the diameter of the stabilizer, has stronger adaptability, can meet the requirements of complex wellbore trajectories, improve drilling efficiency, and reduce accident risks.

[0003] Although existing variable diameter stabilizers can meet the needs of drilling operations to a certain extent, there are still various defects. The mechanical stabilizer only supports preset multi-step radial adjustment and lacks continuous adjustment ability, making it unable to cope with more complex downhole environments. Although the electro-hydraulic stabilizer can achieve higher-precision radial adjustment, it relies on complex hydraulic and electric control systems, increasing structural complexity and maintenance costs. At the same time, problems such as wear and response lag may occur during long-term use. Existing technologies also generally have defects such as the outer diameter being unable to change continuously and the multi-stage control operation being cumbersome. Especially in terms of adapting to high-precision control, stability, and intelligence, existing technologies still cannot fully meet the drilling requirements under harsh working conditions. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a continuously variable diameter stabilizer combining an electric control system and a hydraulic control system, which solves the problems of the outer diameter being unable to change continuously and the multi-stage control operation being cumbersome.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A continuously variable diameter stabilizer combining an electric control system and a hydraulic control system, comprising:

[0006] A mechanical structure, the mechanical structure includes a stabilizer housing, an upper sub provided on the stabilizer housing, a lower sub provided on the stabilizer housing, an axial wedge body, retractable blades, a driven rod, a torque conversion system, a hydraulic system, a first bearing, a second bearing, and a stabilizer sleeve outside the first bearing;

[0007] An electric control system, which is located inside the stabilizer housing, and the electric control system includes a DSP microprocessor, a high-temperature battery pack, a motor, a displacement sensor, and a pressure sensor;

[0008] Hydraulic control system: It includes a hydraulic chamber, a hydraulic drive mechanism, and a solenoid valve located inside the lower sub;

[0009] Closed-loop control unit: It collects data in real time through displacement sensors and pressure sensors, runs the PID control algorithm in combination with a DSP microprocessor, and coordinates the adjustment of the electric control system and the hydraulic control system to achieve stepless radial expansion and contraction of the palm;

[0010] Redundant design: When the electric control system fails, the hydraulic control system automatically takes over the control to maintain the basic functions of the stabilizer.

[0011] Preferably, the axial wedge is connected to the motor through a driven rod, and the torque output by the motor is converted into an axial force through a torque conversion system to drive the lateral displacement of the axial wedge;

[0012] The inclined plane angle of the axial wedge is linked with the longitudinal displacement of the palm to convert the axial force into a radial supporting force;

[0013] The surface of the stabilizer sleeve is coated with a high-temperature and wear-resistant coating, and its diameter is larger than that of the front sleeve. The mechanical structure also includes:

[0014] Palm support arm, which directly contacts the wellbore to provide radial supporting force;

[0015] Baffle, which prevents external impact forces from damaging the internal structure;

[0016] Thrust structure, which is linked with the axial wedge to transmit the axial force driven by hydraulic or electric control;

[0017] Drill string body, the outer diameter of the drill string body and the stabilizer form a matching structure through a connecting body. The connecting body is the part where the stabilizer transmission mechanism is connected to the drill string body, which plays the role of protecting the internal structure of the stabilizer, supporting the working platform of the stabilizer, and at the same time protecting the drill collar drill string and ensuring the normal operation of the drill collar operation.

[0018] Preferably, the DSP microprocessor integrates an adaptive parameter adjustment module to dynamically optimize the PID parameters according to downhole temperature, pressure, and formation resistance;

[0019] The displacement sensor monitors the extension amount of the palm in real time, the pressure sensor monitors the pressure difference on both sides of the hydraulic system, and the DSP microprocessor inputs data that has been filtered and temperature compensated;

[0020] The high-temperature battery pack uses high-temperature resistant materials.

[0021] Preferably, the hydraulic drive mechanism controls the hydraulic oil flow rate and pressure difference by adjusting the opening degree of the solenoid valve to drive the displacement of the axial wedge;

[0022] The hydraulic system is designed in parallel with the electric control system. When the electric control system fails, the hydraulic control system operates independently based on pressure difference feedback.

[0023] Preferably, the control method of the closed-loop control unit includes the following steps:

[0024] Real-time collect displacement, pressure and temperature data, and calculate the error value through the DSP microprocessor;

[0025] Taking PID control as an example, generate control instructions based on the PID algorithm to adjust the motor speed and the opening degree of the solenoid valve;

[0026] The PID control algorithm is the core of the closed-loop system, and its formula is:

[0027]

[0028] In the rapid adjustment stage, the electric control system is the main guide, and the hydraulic control system is used for auxiliary fine adjustment. In the steady state stage, the hydraulic control system compensates for external disturbances. The system force balance equation is:

[0029] ∑F 轴向 =F 液压 -F 摩擦 -F 岩层反力

[0030] ∑F 径向 =F 支撑 -F 井壁反力

[0031] ∑T=T0 - T 阻力

[0032] Preferably, the parameters of the PID control algorithm are dynamically adjusted in the following way:

[0033] The initial parameters are set by the step response method;

[0034] According to the downhole environment parameters, the proportional, integral and differential coefficients are optimized in real time through fuzzy logic or neural network.

[0035] Preferably, it further includes a fault diagnosis and redundancy switching module: real-time monitor the motor current, hydraulic leakage and sensor anomalies. When the electric control system fails, automatically switch to the hydraulic control system to operate independently and send an alarm signal to the ground control system.

[0036] Preferably, a balanced bridge composed of strain gauges is attached to the surface of the axial wedge body to detect the magnitude of the force and achieve temperature compensation.

[0037] Preferably, the stabilizer communicates with the ground control system through the CAN bus, transmits downhole data in real time and receives remote instructions.

[0038] A control method for a continuously variable diameter stabilizer, comprising the following steps:

[0039] a. Real-time collect the displacement of the blade and the pressure difference of the hydraulic system through a displacement sensor and a pressure sensor;

[0040] b. The DSP microprocessor generates a PID control instruction according to the error between the preset target value and the actual value;

[0041] c. The electric control system drives the motor to adjust the lateral displacement of the axial wedge body, and the hydraulic control system adjusts the hydraulic pressure difference through a solenoid valve:

[0042] Through motor control: duty cycle

[0043] Through hydraulic control: solenoid valve opening φ = K v ·ΔP

[0044] d. When the electric control system fails, the hydraulic control system independently controls the telescopic amount of the blade based on the pressure difference feedback to ensure the continuous operation of the stabilizer.

[0045] The present invention provides a continuously variable diameter stabilizer combining an electric control system and a hydraulic control system. It has the following

[0046] Beneficial effects:

[0047] The continuously variable diameter stabilizer combining the electric control system and the hydraulic control system realizes high-precision real-time diameter adjustment through the collaborative work of the DSP microprocessor and the displacement and pressure sensors, and can adapt to the requirements of different well conditions. The hydraulic control system serves as a backup solution for the electric control system. When the electric control system fails due to downhole disturbances or hardware failures, it can automatically take over the control to ensure that the basic functions of the stabilizer are not affected. This dual-system design significantly enhances the reliability, fault tolerance ability of the stabilizer, and extends its service life, and is especially suitable for high-pressure, high-temperature and complex drilling environments.

[0048] Real-time intelligent monitoring and closed-loop control The real-time monitoring function of this technical solution is realized through the built-in sensors and microprocessors, forming a complete closed-loop control system. The displacement sensor can accurately measure the diameter change and feedback the data to the control system to avoid problems of over-adjustment or under-adjustment. The pressure sensor monitors the pressure difference at both ends of the blade in real time, and combines with the hydraulic control system to dynamically adjust the position of the blade to ensure that the diameter of the stabilizer always remains stable. The closed-loop design enables the system to have an adaptive ability, which can automatically adjust the diameter according to the real-time changes of the downhole environment, providing accurate construction guarantee, and is especially suitable for drilling operations with complex wellbore trajectories.

[0049] Breaking through the traditional chute design, the present invention breaks through the limitations of the traditional chute design and provides a stepless adjustment function. Without sacrificing flexibility, stepless adjustment avoids the mechanical wear problems caused by multi-stage switching, thereby improving the durability and stability of the equipment. This innovative design greatly enhances the adaptability of the stabilizer and can better meet the drilling requirements in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0051] Figure 2 It is a schematic diagram of the variable diameter structure change of the present invention;

[0052] Figure 3 It is a combined hydraulic and electric control system diagram of the present invention;

[0053] Figure 4 It is a closed-loop control system diagram of the present invention;

[0054] Figure 5 It is a block diagram of the pressure sensor control system;

[0055] Figure 6 It is a block diagram of the displacement sensor control;

[0056] Figure 7 It is a schematic diagram of the hardware structure.

[0057] Wherein, 1. upper sub; 2. DSP microprocessor; 3. high-temperature battery pack; 4. motor; 5. torque conversion system; 6. hydraulic system; 7. follower rod; 8. first bearing; 9. axial wedge; 10. blade; 11. stabilizer sleeve; 12. second bearing; 13. hydraulic chamber; 14. lower sub; 15. baffle; 16. connecting body; 17. propulsion structure; 18. blade support arm; 19. stabilizer housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of 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.

[0059] Such as Figure 1-7As shown in the figure, an embodiment of the present invention provides a continuously variable diameter stabilizer combining an electric control system and a hydraulic control system, including a mechanical structure. The mechanical structure includes a stabilizer housing 19, an upper sub 1 provided on the stabilizer housing 19, a lower sub 14 provided on the stabilizer housing 19, an axial wedge body 9, a retractable jaw 10, a driven rod 7, a torque conversion system 5, a hydraulic system 6, a first bearing 8, a second bearing 12, and a stabilizer sleeve 11 outside the first bearing 8. The axial wedge body 9 is connected to the motor 4 through the driven rod 7. The torque output by the motor 4 is converted into an axial force through the torque conversion system 5 to drive the lateral displacement of the axial wedge body 9;

[0060] The inclined plane angle of the axial wedge body 9 is linked with the longitudinal displacement of the jaw 10 to convert the axial force into a radial supporting force;

[0061] The surface of the stabilizer sleeve 11 is coated with a high-temperature and wear-resistant coating, and its diameter is larger than that of the front sleeve. The mechanical structure further includes:

[0062] A jaw support arm 18 that directly contacts the wellbore to provide a radial supporting force;

[0063] A baffle 15 to prevent external impact forces from damaging the internal structure;

[0064] A propulsion structure 17 that is linked with the axial wedge body 9 to transmit the axial force driven by hydraulic or electric control;

[0065] A drill string body. The outer diameter of the drill string body and the stabilizer form a matching structure through a connector 16. The connector 16 is the part where the stabilizer transmission mechanism is connected to the drill string body, which plays a role in protecting the internal structure of the stabilizer, supporting the operation of the stabilizer platform, and at the same time protecting the drill collar drill string and ensuring the normal operation of the drill collar operation;

[0066] An electric control system, which is located inside the stabilizer housing 19. The electric control system includes a DSP microprocessor 2, a high-temperature battery pack 3, a motor 4, a displacement sensor, and a pressure sensor. The DSP microprocessor 2 integrates an adaptive parameter adjustment module to dynamically optimize the PID parameters according to the downhole temperature, pressure, and formation resistance;

[0067] The displacement sensor monitors the extension amount of the jaw 10 in real time, the pressure sensor monitors the pressure difference on both sides of the hydraulic system 6, and the DSP microprocessor 2 inputs the data after filtering and temperature compensation;

[0068] The high-temperature battery pack 3 uses high-temperature resistant materials;

[0069] A hydraulic control system: including a hydraulic chamber 13, a hydraulic drive mechanism, and a solenoid valve inside the lower sub 14. The hydraulic drive mechanism controls the hydraulic oil flow rate and pressure difference by adjusting the opening of the solenoid valve to drive the displacement of the axial wedge body 9;

[0070] The hydraulic system 6 is designed in parallel with the electronic control system. When the electronic control system fails, the hydraulic control system operates independently based on pressure difference feedback. The axial pressure P0 exerted by the hydraulic system 6 and the driving torque T0 transmitted by the motor 4 through the torque conversion system 5 are analyzed for the force on the palm 10 as follows:

[0071] 1. Axial force balance: The propulsion structure 17 and the hydraulic system 6

[0072] The hydraulic system 6 drives the propulsion structure 17 through the pressure P0 to generate an axial force F 轴向 , and the calculation formula is:

[0073] F 轴向 = P0·A 活塞

[0074] where A 活塞 is the effective acting area of the hydraulic piston.

[0075] 2. Radial support force conversion: The axial force between the axial wedge 9 and the palm support arm 18 is converted into a radial support force F through the inclined plane angle θ of the wedge, 径向 , and the formula is:

[0076] F 径向 = F 轴向 ·tan(θ)

[0077] This force is used to stabilize the wellbore and prevent wellbore collapse or deviation.

[0078] 3. Torque transmission and balance: The motor 4 and the transmission mechanism

[0079] The motor 4 outputs a torque T0 to drive the hydraulic pump or the mechanical transmission system. The relationship between it and the power P 电机 and the rotational speed ω of the motor 4 is:

[0080]

[0081] The torque needs to overcome the rotational resistance of the drill string and mechanical friction losses.

[0082] 4. Reaction force of the baffle 15

[0083] The baffle 15 bears the external rock formation impact force F 冲击 , and is balanced through structural strength design:

[0084] F 冲击 ≤ σ 材料 ·A 挡板

[0085] where σ 材料 is the yield strength of the material of the baffle 15, and A 挡板 is the stress area

[0086] Closed-loop control unit: It collects data in real time through a displacement sensor and a pressure sensor, combines with the DSP microprocessor 2 to run the PID control algorithm, and coordinately adjusts the electric control system and the hydraulic control system to achieve stepless radial expansion and contraction of the palm 10. The control method of the closed-loop control unit includes the following steps:

[0087] Collect displacement, pressure and temperature data in real time, and calculate the error value through the DSP microprocessor 2;

[0088] Taking PID control as an example, generate control instructions based on the PID algorithm to adjust the speed of the motor 4 and the opening of the solenoid valve;

[0089] In the rapid adjustment stage, the electric control system is the main guide, and the hydraulic control system is used for auxiliary fine adjustment. In the steady state stage, the hydraulic control system compensates for external disturbances. The system force balance equation is:

[0090] ∑F 轴向 =F 液压 -F 摩擦 -F 岩层反力

[0091] ∑F 径向 =F 支撑 -F 井壁反力

[0092] ∑T=T0 - T 阻力

[0093] Force analysis of the closed-loop control system

[0094] 1. Sensor feedback mechanism

[0095] Displacement sensor:

[0096] Function: Monitor the extension amount x of the palm support arm 18 in real time, that is, the actual displacement of the stabilizer palm 10.

[0097] Data flow: The sensor converts the displacement signal analog quantity into an electric signal, which is input into the DSP microprocessor 2 through the analog-to-digital converter ADC. The DSP compares the actual displacement with the target displacement and calculates the error.

[0098] Adjustment function: According to the error value, the DSP generates a control instruction, such as adjusting the speed of the motor 4 or the opening of the hydraulic valve, to drive the palm 10 to expand and contract until the error approaches zero.

[0099] Pressure sensor:

[0100] Function: Monitor the pressure difference on both sides of the hydraulic system 6 to ensure stable axial force.

[0101] Data flow: The pressure difference signal is fed back to the DSP, and combined with the displacement sensor data, it is judged whether the system is in a balanced state.

[0102] Regulating function: If it deviates from the set value, the DSP dynamically adjusts the opening of the solenoid valve to change the hydraulic flow rate or pressure to compensate for external disturbances, including formation resistance and temperature changes.

[0103] 2. Analysis of PID control algorithm

[0104] A variety of control algorithms can be used to achieve the control of the palm 10. Taking PID control as an example, the control algorithm is the core of the closed-loop system, and its formula is:

[0105]

[0106] Where:

[0107] K p ·e(t): Proportional term, which responds quickly to the current error.

[0108] Function: Directly adjust the output according to the size of the error. The larger the error, the stronger the adjustment force.

[0109] Example: If the actual displacement is 2 mm less than the target, the proportional term immediately increases the speed of motor 4 to compensate.

[0110] Integral term, which eliminates the steady-state error.

[0111] Function: Accumulate historical errors to solve the residual deviation that cannot be completely eliminated by proportional control.

[0112] Example: If the system has a continuous deviation due to hydraulic leakage, the integral term gradually increases the control amount until the error is zero.

[0113] Differential term, which suppresses overshoot and oscillation.

[0114] Function: Predict the change trend of the error, decelerate or reverse the adjustment in advance to avoid system overshoot.

[0115] Example: When the palm 10 quickly approaches the target displacement, the differential term reduces the adjustment speed to prevent exceeding the set value due to inertia.

[0116] 3. Closed-loop control process:

[0117] Data acquisition: The displacement and pressure sensors collect downhole data in real time.

[0118] Error calculation: The DSP calculates the displacement error e(t) and the pressure difference deviation.

[0119] PID operation: Generate the control quantity u(t) according to the formula, and dynamically adjust the speed of motor 4 or the opening of the solenoid valve.

[0120] Execute adjustment:

[0121] Electric control system: The motor 4 drives the axial wedge 9 through the torque conversion system 5 to change the extension amount of the palm 10.

[0122] Hydraulic control system: The hydraulic valve adjusts the oil pressure to compensate for the axial force fluctuation.

[0123] Feedback loop: The new state data is fed back to the DSP again to form a closed-loop control until the system is stable.

[0124] A control method for a continuously variable diameter stabilizer, comprising the following steps:

[0125] a. The displacement of the palm 10 and the pressure difference of the hydraulic system 6 are collected in real time through the displacement sensor and the pressure sensor;

[0126] b. The DSP microprocessor 2 generates a PID control instruction according to the error between the preset target value and the actual value;

[0127] c. The electric control system drives the motor 4 to adjust the lateral displacement of the axial wedge 9, and the hydraulic system 6 adjusts the hydraulic pressure difference through the solenoid valve;

[0128] Control by the motor 4: Duty ratio

[0129] Control by hydraulic pressure: The solenoid valve opening φ = K v ·ΔP

[0130] d. When the electric control system fails, the hydraulic control system independently controls the telescopic amount of the palm 10 based on the pressure difference feedback to ensure the continuous operation of the stabilizer.

[0131] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stepless variable diameter stabilizer combining an electric control system and a hydraulic control system, characterized in that: include: A mechanical structure, comprising a stabilizer housing (19), an upper joint (1) arranged on the stabilizer housing (19), a lower joint (14) arranged on the stabilizer housing (19), an axial wedge (9), a retractable palm (10), a driven rod (7), a torque conversion system (5), a hydraulic system (6), a first bearing (8), a second bearing (12), and a stabilizer sleeve (11) outside the first bearing (8); An electric control system, which is located inside the stabilizer housing (19), and includes a DSP microprocessor (2), a high-temperature battery pack (3), a motor (4), a displacement sensor, and a pressure sensor; The hydraulic control system comprises a hydraulic chamber (13) located inside the lower joint (14), a hydraulic drive mechanism and a solenoid valve; Closed-loop control unit: collects data in real time through displacement sensors and pressure sensors, and runs PID control algorithm in conjunction with DSP microprocessor (2).

2. The stepless variable diameter stabilizer combining an electric control system and a hydraulic control system according to claim 1 is characterized in that: The axial wedge body (9) is connected to the motor (4) via a driven rod (7); the torque output by the motor (4) is converted into an axial force via a torque conversion system (5) to drive the axial wedge body (9) to move laterally; the torque conversion system (5), the driven rod (7), the axial wedge body (9) and the hydraulic system (6) form a transmission mechanism; The inclined surface angle of the axial wedge (9) is linked with the longitudinal displacement of the leg (10) to convert the axial force into a radial supporting force; The stabilizer sleeve (11) is coated with a high temperature and wear resistant coating on its surface and has a diameter greater than that of the front sleeve. The mechanical structure further comprises: The palm support arm (18) directly contacts the well wall to provide radial support force; A baffle (15) to prevent external impact forces from damaging the internal structure; A propulsion structure (17) which is linked with the axial wedge (9) to transmit the axial force driven by hydraulic or electric control; A drill string body, wherein the drill string body and the outer diameter and the stabilizer form a matching structure through a connector (16), and the connector (16) is a part connecting the stabilizer transmission mechanism and the drill string body.

3. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized in that: The DSP microprocessor (2) is integrated with an adaptive parameter adjustment module to dynamically optimize PID parameters according to downhole temperature, pressure and rock formation resistance; The displacement sensor monitors the extension amount of the palm (10) in real time, the pressure sensor monitors the pressure difference on both sides of the hydraulic system (6), and the DSP microprocessor (2) inputs filtered and temperature-compensated data; The high-temperature battery pack (3) is made of high-temperature resistant material.

4. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized in that: The hydraulic drive mechanism controls the flow rate and pressure difference of the hydraulic oil by adjusting the opening of the solenoid valve, thereby driving the axial wedge-shaped body (9) to move; The hydraulic system (6) is designed in parallel with the electronic control system. When the electronic control system fails, the hydraulic control system operates independently based on pressure difference feedback.

5. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized in that: The control method of the closed-loop control unit comprises the following steps: Collect displacement, pressure and temperature data in real time and calculate error values ​​through DSP microprocessor (2); The PID control algorithm is the core of the closed-loop system, and its formula is: The force balance equation of the system is: ∑F 轴向 =F 液压 -F 摩擦 -F 岩层反力 ∑F 径向 =F 支撑 -F 井壁反力 ∑T=T0-T 阻力 。 6. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized in that: The PID control algorithm parameters are dynamically adjusted in the following ways: The initial parameters were set using the step response method.

7. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized in that: It also includes fault diagnosis and redundant switching modules.

8. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized by: A balance bridge composed of strain gauges is attached to the surface of the axial wedge (9) and is used to detect the magnitude of force and achieve temperature compensation.

9. The stepless variable diameter stabilizer combining electric control and hydraulic control system according to claim 1 is characterized in that: The stabilizer communicates with the ground control system via the CAN bus, transmits downhole data in real time and receives remote commands.

10. A control method for a stepless variable diameter stabilizer, characterized in that: The following steps are involved: a. Real-time acquisition of the displacement of the palm (10) and the pressure difference of the hydraulic system through a displacement sensor and a pressure sensor; b. The DSP microprocessor (2) generates a PID control instruction according to the error between the preset target value and the actual value; c. The electric control system drives the motor (4) to adjust the lateral displacement of the axial wedge (9), and the hydraulic control system (6) adjusts the hydraulic pressure difference through the solenoid valve; Controlled by motor (4): Duty cycle Through hydraulic control: solenoid valve opening φ = K v ΔP d. When the electronic control system fails, the hydraulic control system independently controls the extension and contraction of the palm (10) based on the pressure difference feedback to ensure that the stabilizer continues to work.

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