Composite drill rod automatic deviation correction guiding device and method for kilometer directional drilling

Abstract

The application relates to the technical field of drilling, in particular to a composite drill rod automatic deviation rectifying and guiding device and method for kilometer directional drilling, which comprises a shell, a driving shaft, a sensor assembly, an MCU controller assembly and an eccentric assembly. The eccentric assembly comprises a driving ring, a sliding block, a spring, a sleeve, a transfer cavity, an electromagnetic three-way valve, a one-way valve, an electromagnetic valve and a flowmeter. The driving ring, the sliding block, the electromagnetic valve and the flowmeter are arranged, an electric driving system is not needed, the eccentric operation of the driving shaft can be realized only by relying on the self drilling hydraulic pressure, the consumption of electric energy is reduced, and more durable guiding work is realized. The annular piston is additionally arranged in the transfer cavity, and the magneto-rheological fluid is arranged as the hydraulic medium, so that the failure rate of the guiding device is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling, in particular to a composite drill rod automatic deviation correction guide device and method for kilometer directional drilling. BACKGROUND

[0002] In coal mining, kilometer directional drilling technology is needed for gas extraction, geological structure exploration and coal seam occurrence detection, underground emergency rescue passage construction, and coalbed methane development and comprehensive utilization. For example, in gas extraction, kilometer directional drilling is used to pre-extract coal seam gas over a long distance, and the drilling can cover multiple mining faces, with extraction efficiency improved by more than 30% compared to traditional drilling. Kilometer directional drilling constructs directional holes along the strike or inclination of the coal seam, continuously collects coal seam thickness and inclination data, and optimizes mining process design. In geological structure exploration and coal seam occurrence detection, kilometer directional drilling is used in combination with horizontal well technology to achieve large-scale coalbed methane extraction, promote clean energy transformation in coal mines, and early rotary steering tools use side-pushing bits to apply external force to the bit, forcing the bit to deviate from the drill tool axis to achieve build-up capability. Some tools use retractable wing ribs to push against the well wall to achieve build-up capability, using the friction between the wing ribs and the well wall to achieve directional drilling effect. Currently, the main method of guidance is the measurement-while-drilling (MWD) system, which uses a gyroscope guidance method to display real-time trajectory data in the ground receiving equipment using a gyroscope, accelerometer, and magnetometer, and generates a deviation curve by comparing the design trajectory, and makes corrections according to the deviation.

[0003] Currently, the Geo-Pilot rotary steering drilling system developed by the United States' Sperry Corporation and Japan's National Oil Company uses an eccentric device composed of two eccentric rings to bend the drive shaft, and then uses a center bearing to form a support point to make the bit point in the opposite direction of the bend in the shaft, generating build-up capability. However, this eccentric ring device requires an additional electric drive system to adjust the eccentric ring, and additional power is needed. During guidance, the electric drive system needs to continuously apply torque to overcome the thrust on the bit, resulting in high energy consumption. When the rated capacity of the lithium battery is constant, the continuous working time of the system will be shortened. At the same time, as the mining depth increases and the mining distance lengthens, the geological conditions underground become more complex, and problems are more likely to occur. When drilling through fault fracture zones, the bit will be subjected to a large external force, which can easily damage the electric drive system. Therefore, when encountering fault fracture zones, the failure rate of the system will increase. To address this, the applicant proposes a composite drill rod automatic deviation correction guide device and method for kilometer directional drilling that can use its own high-pressure water flow to drive the eccentric device, saving electrical energy and reducing the failure rate when encountering fault fracture zones. SUMMARY

[0004] The purpose of the present application is to provide a composite drill rod automatic deviation correction guide device for kilometer directional drilling to solve the problems raised in the background art.

[0005] The first purpose of the present application is to provide a composite drill rod automatic deviation correction guide device for kilometer directional drilling, which comprises a housing, a drive shaft, a sensor assembly, an MCU controller assembly, an eccentric assembly, a centering bearing, and a sealing kit. The drive shaft is provided with a main drilling fluid channel inside, and the drive shaft is installed in the eccentric assembly and penetrates the centering bearing. The sensor assembly and the MCU controller assembly are arranged on the inner wall of the housing, and two sealing kits are arranged at both ends of the housing. The eccentric assembly comprises a drive ring, a sliding block, a sleeve, a transfer cavity, an electromagnetic three-way valve, a check valve, an electromagnetic valve, and a flowmeter. A plurality of hydraulic grooves are formed in the outer periphery of the drive ring, and the sliding block is slidingly connected in the hydraulic grooves. A sliding sealing ring is arranged between the sliding block and the hydraulic groove. The hydraulic grooves are connected to the transfer cavities on both sides through two first high-pressure hoses. The electromagnetic valve and the flowmeter are arranged on the first high-pressure hose. The end portions of the plurality of sliding blocks are supported on the housing, and the inner ring of the drive ring is connected to the drive shaft through a bearing. The transfer cavities are connected to the sleeve through a second high-pressure hose, and the electromagnetic three-way valve is arranged on the second high-pressure hose. The check valve is arranged on the housing and is used to discharge fluid outside the housing. The sleeve is rotatably sleeved on the drive shaft, and a through hole is formed in the drive shaft and located in the sleeve, which is used to communicate the internal space of the sleeve with the main drilling fluid channel.

[0006] Preferably, the sliding block is installed in the hydraulic groove through a spring, which is used to support the sliding block and reduce the required liquid pressure.

[0007] Preferably, an annular piston is arranged in the transfer cavity, which divides the transfer cavity into two independent parts. One part is connected to the hydraulic groove and filled with bubble-free hydraulic medium, and the other part is connected to the sleeve and filled with drilling fluid.

[0008] Preferably, the hydraulic medium is a magneto-rheological fluid, and an electromagnetic coil is arranged on the drive ring.

[0009] Preferably, the drive ring is made of magnetic shielding material.

[0010] Preferably, a rotary sealing ring is arranged at the connection between the sleeve and the drive shaft.

[0011] Preferably, a lithium battery is built in the MCU controller assembly.

[0012] Preferably, the sealing kit is a high-elastic air rubber sealing ring.

[0013] Preferably, the shell is provided with retractable wing ribs.

[0014] A second object of the present application is to provide a composite drill rod automatic deviation correction guiding method for kilometer directional drilling, characterized in that the method comprises the following steps:

[0015] S1: continuously monitoring the current posture and working condition information of the drill rod through the sensor assembly, and transmitting the data to the MCU controller assembly in real time;

[0016] S2: comparing the preset target trajectory with the posture and working condition information monitored by the sensor assembly, determining the required eccentric direction and eccentricity, and then calculating the liquid inlet amount of each hydraulic groove on the driving ring through the MCU controller assembly;

[0017] S3: using the pressure of the drilling fluid main flow channel in the driving shaft as a power source, the through hole on the driving shaft communicates the drilling fluid main flow channel with the inside of the sleeve, so that the drilling fluid pressure is maintained in the sleeve, the MCU controller assembly controls the opening of the electromagnetic three-way valve corresponding to the target direction, the drilling fluid enters the drilling fluid side of the transfer cavity, and pushes the annular piston to extrude the hydraulic medium on the other side;

[0018] S4: the MCU controller assembly opens the electromagnetic valve corresponding to the hydraulic groove that needs to inlet liquid, the hydraulic medium enters the hydraulic groove through the first high-pressure hose, pushes the sliding block to extend outward, the end of the sliding block abuts against the shell, generates a deviation force, and the flow meter is used to monitor the liquid inlet amount in real time, when the calculated value is reached, the MCU controller assembly controls the electromagnetic valve to be closed, so as to ensure the accurate extension amount of the sliding block, the electromagnetic valve on the side of the hydraulic groove that needs to discharge liquid is opened, the hydraulic medium in the hydraulic groove flows into the other transfer cavity through the first high-pressure hose under the action of external pressure, and is discharged outside the shell through the third passage of the electromagnetic three-way valve and the one-way valve;

[0019] S5: by the differential extension of the sliding block, the driving ring generates a preset direction eccentricity in the shell, and then the driving shaft is driven to eccentricity synchronously through the bearing, and at the same time, the driving shaft remains stable rotation under the constraint of the centering bearing, so as to realize the guiding and deviation correction of the drill bit to the target direction.

[0020] Preferably, the magneto-rheological fluid is used as the hydraulic medium, and when the sensor detects severe vibration or enters the fault fracture zone, the MCU controller assembly controls the electromagnetic coil on the driving ring to be electrified. Beneficial effects

[0021] By arranging the driving ring, the sliding block, the electromagnetic valve, the flow meter and other structures, the eccentric operation of the driving shaft can be realized only by relying on the drilling fluid pressure without using the electric drive system, so as to reduce the consumption of electric energy and realize more durable guiding work.

[0022] By adding a ring-shaped piston in the transfer cavity and setting the magnetorheological fluid as the hydraulic medium, on one hand, the precision control of the liquid inflow is improved, and the precision of the eccentric control is improved; on the other hand, when severe vibration or the drill bit enters a fault fracture zone, the magnetorheological fluid is excited, the rigidity of the magnetorheological fluid is greatly increased, the magnetorheological fluid itself absorbs a large amount of impact force, so that the pressure bearing of the electromagnetic valve and the first high-pressure hose is greatly reduced, and the failure rate of the guiding device is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0024] Fig. 1 is a schematic diagram of the three-dimensional structure of the present application;

[0025] Fig. 2 is a schematic diagram of the three-dimensional structure of the eccentric assembly described in the present application;

[0026] Fig. 3 is a sectional view of the eccentric assembly described in the present application. DETAILED DESCRIPTION

[0027] The composite drill rod automatic deviation correction guiding device for kilometer directional drilling proposed by the present application will be further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more clear according to the following description. It should be noted that the drawings are all very simplified and use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the present application.

[0028] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or

[0029] implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0030] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and thus

[0031] The illustrations only show the components relevant to this invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the state, quantity and proportion of each component can be changed arbitrarily, and the layout of the components may also be more complex.

[0032] A composite drill pipe automatic correction and guidance device for kilometer-long directional drilling, such as Figs. 1-3 As shown, the device includes a housing 1, a drive shaft 2, a sensor assembly 3, an MCU controller assembly 4, an eccentric assembly 5, a central bearing 6, and a sealing kit 7. One end of the drive shaft 2 is connected to a hydraulic motor, and the other end is connected to a drill bit. The drive shaft 2 has a drilling fluid main channel. The drive shaft 2 is installed in the eccentric assembly 5. The drive shaft 2 rotates through the central bearing 6. The sensor assembly 3 and the MCU controller assembly 4 are both located on the inner wall of the housing 1. The two sealing kits 7 are respectively located at both ends of the housing 1 for elastic sealing between the housing 1 and the drive shaft 2.

[0033] The eccentric assembly 5 includes a drive ring 51, a slider 52, a sleeve 54, a transfer cavity 55, a solenoid three-way valve 56, a one-way valve 57, a solenoid valve 58, and a flow meter 59. The drive ring 51 is a hollow annular structure with multiple hydraulic grooves 511 on its outer periphery. The slider 52 is slidably connected to the hydraulic grooves 511, and a sliding seal ring is provided between the slider 52 and the hydraulic grooves 511 to prevent leakage of hydraulic medium in the hydraulic grooves. The hydraulic grooves 511 are connected to the transfer cavities 55 on both sides through two first high-pressure hoses 512. The solenoid valve 58 and the flow meter 59 are provided on the first high-pressure hoses 512. The ends of the multiple sliders 52 are supported on the outer shell 1. The inner ring of the drive ring 51 is connected to the drive shaft 2 through a bearing. The transfer cavity 55 is connected to the second high-pressure hose 55. 1. A solenoid three-way valve 56 is installed on the sleeve 54 and the second high-pressure hose 551. The first passage of the solenoid three-way valve 56 is connected to the transfer chamber 55, the second passage is connected to the sleeve 54, and the third passage is connected to a one-way valve 57. The one-way valve 57 is installed on the outer shell 1 and is used to discharge fluid to the outside of the outer shell 1. The working mode of the solenoid three-way valve 56 is set as follows: when it is open, the first and second passages are connected and the third passage is closed; when it is closed, the first and third passages are connected and the second passage is closed. The sleeve 54 is rotatably sleeved on the drive shaft 2. A rotary sealing ring 541 is provided at the rotatable sleeve. A through hole is opened on the drive shaft 2. The through hole is located inside the sleeve 54 and is used to connect the internal space of the sleeve 54 with the main channel of the drilling fluid, so that the sleeve 54 has the pressure of the main channel of the drilling fluid.

[0034] In some embodiments, the slider 52 is mounted in the hydraulic groove 511 by a spring 53, which supports the slider 52 and reduces the required inlet pressure.

[0035] The MCU controller assembly 4 is electrically connected with the electromagnetic three-way valve 56, the electromagnetic valve 58 and the flow meter 59. The MCU controller assembly 4 is used to calculate the liquid inlet amount of each hydraulic groove 511 according to the eccentric requirement. When the driving ring 51 needs to be driven to be upwardly eccentric, the lower hydraulic groove 511 needs to inlet liquid, and the upper hydraulic groove 511 needs to outlet liquid. The hydraulic groove 511 which needs to inlet liquid opens the electromagnetic valve 58 and the electromagnetic three-way valve 56 on one side of the hydraulic groove 511. When the flow meter 59 detects that the liquid inlet amount meets the requirement, the electromagnetic valve 58 is closed. The hydraulic groove 511 which does not need to inlet liquid opens the electromagnetic valve 58 on the other side, so that the liquid in the hydraulic groove 511 is pressed into the transfer cavity 55 on the other side, and is finally discharged from the one-way valve 57 to the outside of the shell 1. After the eccentricity is completed, all the electromagnetic valves 58 are closed. The driving shaft 2 is guided under the action of the driving ring 51 and the centering bearing 6. The system only needs to rely on the pressure of the drilling fluid 554 to realize the eccentric operation of the driving shaft 2, reduces the consumption of electric energy, and realizes more durable guiding work.

[0036] Because there may be bubbles in the water flow in the main flow channel of the drilling fluid, when entering the hydraulic groove 511, the flow meter 59 may produce errors, causing the extension distance of the sliding block 52 to be not accurate enough. Therefore, in an embodiment, the transfer cavity 55 is provided with an annular piston 552. The annular piston 552 divides the transfer cavity 55 into two independent parts. One part is connected with the hydraulic groove 511, and the other part is connected with the sleeve 54. The part connected with the hydraulic groove 511 is filled with bubble-free hydraulic medium 553, and the part connected with the sleeve 54 is connected with the drilling fluid 554. When the eccentric operation is performed, the electromagnetic three-way valve 56 on one side works, so that the drilling fluid pushes the annular piston 552, and the hydraulic medium 553 on the same side is pressed into the hydraulic groove 511 which needs to inlet liquid. The hydraulic groove 511 which needs to outlet liquid discharges the hydraulic medium 553 into the transfer cavity 55 on the other side for the next eccentric operation. When the eccentric operation is performed, the electromagnetic three-way valve 56 on the other side works, so that the annular piston 552 is pushed back. In this way, the hydraulic medium 553 only flows back and forth in the transfer cavity 55 and the hydraulic groove 511, and no bubbles are generated. The flow meter 59 can accurately measure the liquid inlet amount.

[0037] In one embodiment, the hydraulic medium 553 is a magneto-rheological fluid, and the drive ring 51 is provided with an electromagnetic coil 513. The magneto-rheological fluid is a suspension system formed by dispersing micron-sized soft magnetic particles (such as carbonyl iron) in a non-magnetic carrier liquid (silicone oil or mineral oil). When an external magnetic field is applied, the particles will quickly form a chain structure, causing the material to change from a liquid to a semi-solid state, and the shear yield strength can jump from the 1 kPa level to the 50 kPa level. When the sensor assembly 3 detects severe vibration or the drill bit enters a fault fracture zone, the MCU controller assembly 4 energizes the electromagnetic coil 513 to generate a magnetic field, excites the magneto-rheological fluid, and greatly increases the rigidity of the magneto-rheological fluid. The magneto-rheological fluid itself absorbs a large amount of impact force, thereby greatly reducing the pressure that the electromagnetic valve 58 and the first high-pressure hose 512 bear, reducing the failure rate of the guiding device. The drive ring 51 is made of magnetic shielding material such as permalloy and silicon steel, so that the magnetic field generated by the electromagnetic coil 513 only acts on the magneto-rheological fluid, reducing the influence of the magnetic field on the sensor assembly 3. The MCU controller assembly 4 is built-in with a lithium battery for power supply.

[0038] The sealing kit 7 is a high-elastic air rubber seal ring that realizes flexible sealing. The housing 1 is provided with retractable wing ribs that are used together with the eccentric assembly 5 to realize the collaborative deviation function.

[0039] A composite drill rod automatic deviation correction and guiding method for kilometer directional drilling, the method comprising the following steps:

[0040] S1: Continuously monitor the current posture and working condition information of the drill rod through the sensor assembly 3, and transmit the data to the MCU controller assembly 4 in real time;

[0041] S2: The MCU controller assembly 4 compares the preset target trajectory with the posture and working condition information monitored by the sensor assembly 3 to determine the required eccentric direction and eccentric amount, and then calculates the liquid inlet amount of each hydraulic groove 511 on each drive ring 51;

[0042] S3: The pressure in the main drilling fluid channel in the drive shaft 2 is used as a power source. The through hole on the drive shaft 2 connects the main drilling fluid channel with the inside of the sleeve 54, so that the drilling fluid pressure is maintained in the sleeve 54. The MCU controller assembly 4 controls the electromagnetic three-way valve 56 in the target direction to open, and the drilling fluid enters the drilling fluid side of the transfer cavity 55, pushing the annular piston 552 to extrude the hydraulic medium 553 on the other side;

[0043] S4: MCU controller component 4 opens the electromagnetic valve 58 corresponding to the side of the hydraulic tank 511 that needs to enter the liquid, and the hydraulic medium 553 enters the hydraulic tank 511 through the first high-pressure hose 512, pushing the sliding block 52 to extend outward, and the sliding block end abuts against the shell 1, generating a biasing force. The flow meter 59 is used to monitor the liquid inflow in real time, and when the calculated value is reached, the MCU controller component 4 controls the electromagnetic valve 58 to close, ensuring the accuracy of the sliding block extension. The electromagnetic valve 58 on the side of the hydraulic tank 511 that needs to discharge liquid is opened, and the hydraulic medium 553 in the hydraulic tank 511 flows into the other side of the transfer cavity 55 under external pressure, and is discharged outside the shell 1 through the third passage of the electromagnetic three-way valve 56 and the one-way valve 57;

[0044] S5: By the differential extension of the sliding block 52, the driving ring 51 generates a preset direction eccentricity in the shell 1, and then drives the driving shaft 2 to synchronously eccentric through the bearing, while the driving shaft 2 remains stable rotation under the constraint of the centering bearing 6, realizing the guiding and correction of the drill bit to the target direction.

[0045] In one embodiment, the magnetorheological fluid is used as the hydraulic medium 553, and when the sensor detects severe vibration or enters the fault fracture zone, the MCU controller component 4 controls the electromagnetic coil 513 on the driving ring 51 to be electrified, so that the magnetorheological fluid hardens, absorbs the impact force, and reduces the pressure load of the electromagnetic valve 58, high-pressure hose and other components.

[0046] In one embodiment, the annular piston 552 in the transfer cavity 55 isolates the hydraulic medium 553 from the drilling fluid 554, ensuring that the hydraulic medium has no air bubbles, avoiding measurement errors of the flow meter 59, and improving the extension and retraction accuracy of the sliding block.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A composite drill pipe automatic correction and guidance device for kilometer-long directional drilling, comprising a housing, a drive shaft, a sensor assembly, an MCU controller assembly, an eccentric assembly, a central bearing, and sealing kits, wherein the drive shaft has a drilling fluid main channel, is mounted in the eccentric assembly, and rotates through the central bearing; the sensor assembly and the MCU controller assembly are both disposed on the inner wall of the housing, and the two sealing kits are respectively disposed at both ends of the housing; characterized in that: The eccentric assembly includes a drive ring, a slider, a sleeve, a transfer cavity, a solenoid three-way valve, a check valve, a solenoid valve, and a flow meter. The drive ring has multiple hydraulic grooves on its outer periphery. The slider is slidably connected within the hydraulic grooves, and a sliding seal is provided between the slider and the hydraulic grooves. The hydraulic grooves are connected to the transfer cavities on both sides via two first high-pressure hoses. A solenoid valve and a flow meter are installed on the first high-pressure hoses. The ends of the multiple sliders are supported on the outer casing. The inner ring of the drive ring is connected to the drive shaft via a bearing. The transfer cavity is connected to the sleeve via a second high-pressure hose, which has a solenoid three-way valve. The check valve is located on the outer casing and is used to discharge fluid to the outside of the casing. The sleeve is rotatably fitted onto the drive shaft, which has a through hole located inside the sleeve. The through hole connects the internal space of the sleeve to the main drilling fluid channel. The transfer chamber is equipped with an annular piston, which divides the transfer chamber into two independent parts. One part is connected to the hydraulic tank, and the other part is connected to the sleeve. The part connected to the hydraulic tank is filled with air-free hydraulic medium, and the part connected to the sleeve is drilling fluid. The hydraulic medium is a magnetorheological fluid, and an electromagnetic coil is provided on the drive ring. The drive ring is made of magnetically shielded material.

2. The composite drill rod automatic correction and guidance device for kilometer-long directional drilling according to claim 1, characterized in that, The slider is mounted in the hydraulic groove by a spring, which supports the slider.

3. The composite drill rod automatic correction and guidance device for kilometer-long directional drilling according to claim 1, characterized in that, A rotary sealing ring is provided at the connection between the sleeve and the drive shaft.

4. The composite drill rod automatic correction and guidance device for kilometer-long directional drilling according to claim 1, characterized in that, The MCU controller assembly has a built-in lithium battery.

5. The composite drill rod automatic correction and guidance device for kilometer-long directional drilling according to claim 1, characterized in that, The sealing kit is a high-elasticity air rubber sealing ring.

6. A method for using a composite drill rod automatic correction and guidance device for kilometer-long directional drilling as described in any one of claims 1-5, characterized in that, The method includes the following steps: S1: The current attitude and working condition of the drill pipe are continuously monitored by the sensor components, and the data is transmitted to the MCU controller component in real time. S2: The MCU controller component compares the preset target trajectory with the attitude and working condition information monitored by the sensor component to determine the required eccentric direction and eccentricity, and then calculates the amount of liquid entering each hydraulic groove on each drive ring. S3: Using the pressure of the main drilling fluid channel inside the drive shaft as a power source, the through hole on the drive shaft connects the main drilling fluid channel with the inside of the sleeve, so that the drilling fluid pressure inside the sleeve is maintained. The MCU controller component controls the opening of the electromagnetic three-way valve corresponding to the target direction, and the drilling fluid enters the drilling fluid side of the transfer chamber, pushing the annular piston to squeeze the hydraulic medium on the other side. S4: The MCU controller component opens the solenoid valve corresponding to the hydraulic tank on the side that needs to be filled with liquid. The hydraulic medium enters the hydraulic tank through the first high-pressure hose, pushing the slider to extend outward. The end of the slider presses against the outer shell, generating a deflection force. The flow meter monitors the liquid inflow in real time. When the calculated value is reached, the MCU controller component controls the solenoid valve to close, ensuring that the slider extension is accurate. The solenoid valve on the side of the hydraulic tank that needs to be drained opens. Under the action of external pressure, the hydraulic medium in the hydraulic tank flows into the transfer chamber on the other side through the first high-pressure hose, and is discharged outside the outer shell through the third passage of the solenoid three-way valve and the check valve. S5: Through the differential extension and retraction of the slider, the drive ring generates a preset eccentricity in the outer shell, which in turn drives the drive shaft to be synchronously eccentric through the bearing. At the same time, the drive shaft maintains stable rotation under the constraint of the central bearing, thereby achieving the guidance and correction of the drill bit in the target direction.

7. The method according to claim 6, characterized in that, Magnetorheological fluid is used as the hydraulic medium. When the sensor detects severe vibration or enters the fault fracture zone, the MCU controller component controls the electromagnetic coil on the drive ring to be energized.

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