Intelligent control type variable diameter stabilizer

Abstract

The application relates to the technical field of well drilling, and discloses an intelligent control type variable-diameter stabilizer, which comprises a variable-diameter mechanism, a driving mechanism and a non-magnetic drill collar, a connecting joint and a variable-diameter joint which are screw-connected together from top to bottom, the variable-diameter mechanism comprises a centralizing block and a moving column, two installation ring grooves are arranged on the outer side of the variable-diameter joint, the centralizing block is slidingly installed in the installation ring grooves, a limiting ring is fixedly installed on the outer side of the variable-diameter joint, a reset spring is arranged between the centralizing block and the limiting ring, a connecting column is arranged in the middle of the centralizing block, a guide column is slidingly installed on the variable-diameter joint, the connecting column is installed on the guide column, a continuous inclined surface is arranged on the outer side of the moving column, the driving mechanism for driving the moving column to move up and down is arranged in the connecting joint, the non-magnetic drill collar is internally provided with a control system for controlling the movement of the driving mechanism and capable of feeding the extension distance of the centralizing block to the ground operator. The variable-diameter stabilizer is reasonable and compact in structure, convenient to use, capable of accurately judging the working state of the downhole variable-diameter stabilizer, and safe, labor-saving and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling, and is an intelligent control type variable-diameter stabilizer. BACKGROUND

[0002] The variable-diameter stabilizer is a downhole tool that changes its outer diameter through a certain control mode. When it is applied in directional well drilling and horizontal well drilling, the lateral force of the drill bit or the rotation angle of the drill bit can be changed, thereby obtaining different mechanical properties of the bottom hole assembly, achieving the purpose of controlling the well trajectory under the condition of not tripping the tool, greatly reducing the drilling cycle, improving the drilling efficiency, and reducing the probability of downhole complex accidents. The existing variable-diameter stabilizer in China cannot accurately judge the working state of the downhole variable-diameter stabilizer when working in the well, the variable-diameter frequency is limited, and the safety and reliability of the pure mechanical variable-diameter stabilizer cannot be guaranteed, which cannot well meet the control requirements of the well trajectory in directional drilling operation. SUMMARY

[0003] The present application provides an intelligent control type variable-diameter stabilizer, which overcomes the shortcomings of the prior art and effectively solves the problems of the existing variable-diameter stabilizer, i.e., the inability to accurately judge the working state of the downhole variable-diameter stabilizer and the inability to accurately control the extension distance of the stabilizing block of the variable-diameter stabilizer.

[0004] The technical scheme of the present application is realized through the following measures: an intelligent control type variable-diameter stabilizer, comprising a variable-diameter mechanism, a driving mechanism, and a non-magnetic drill collar, a connecting joint, and a variable-diameter joint that are threadedly connected together from top to bottom, the variable-diameter mechanism comprises three stabilizing blocks that are uniformly distributed on the outer side of the variable-diameter joint in the circumferential direction and a moving column that is slidingly installed in the inner part of the variable-diameter joint, two installation ring grooves are arranged on the outer side of the middle part of the variable-diameter joint in an up-down interval, the upper and lower ends of the stabilizing block are each provided with an arc-shaped installation table that cooperates with the installation ring groove, the stabilizing block is slidingly installed in the installation ring groove through the installation table, a limiting ring that prevents the installation table from sliding out of the installation ring groove is fixedly installed on the outer side of the variable-diameter joint corresponding to the position of the installation table, a return spring is arranged between the installation table and the limiting ring corresponding thereto, a connecting column is arranged in the middle part of the stabilizing block, a guide hole that penetrates the inside and outside of the variable-diameter joint is arranged on the variable-diameter joint corresponding to the position of the connecting column, a guide column is slidingly installed in the guide hole, an installation hole that cooperates with the connecting column is arranged on the outer end of the guide column, the connecting column is inserted into the installation hole, a continuous inclined surface for driving the stabilizing block to move outward is arranged on the outer side of the moving column corresponding to the inner end position of the guide column, a driving mechanism for driving the moving column to move up and down is arranged in the inner part of the connecting joint corresponding to the position above the moving column, the upper end of the moving column is in transmission connection with the driving mechanism, a control system for controlling the movement of the driving mechanism and capable of feeding back the extension distance of the stabilizing block to the ground operator is arranged in the inner part of the non-magnetic drill collar corresponding to the position above the driving mechanism, and the driving mechanism is in electrical connection with the control system.

[0005] The following is a further optimization or / and improvement of the above technical solutions:

[0006] The driving mechanism can include a micro motor fixedly installed inside the connecting joint, an output shaft of the micro motor is fixedly installed with a transmission screw rod, the transmission screw rod is installed with a screw nut, the transmission screw rod is externally sleeved with an extended sleeve rod, the upper end of the extended sleeve rod is fixedly connected with the lower end of the screw nut, the lower end of the extended sleeve rod is fixedly installed with a connecting sleeve, the lower end of the connecting sleeve is threadedly connected with the upper end of the moving column, the micro motor is externally sleeved with a protective sleeve, the micro motor, the transmission screw rod, the screw nut and the connecting sleeve are sleeved inside the protective sleeve, an internal float is slidingly and sealingly installed inside the connecting sleeve corresponding to the position above the moving column.

[0007] The non-magnetic drill collar corresponding to the position above the protective sleeve can be internally provided with an instrument protection sleeve, the lower end of the instrument protection sleeve is threadedly connected with the upper end of the protective sleeve, the control system includes a pulse decoding circuit, a single-chip microcomputer, a motor control circuit and an MWD instrument, the MWD instrument includes an MWD downhole instrument installed inside the instrument protection sleeve and an MWD uphole instrument placed on the ground, the MWD downhole instrument and the MWD uphole instrument are electrically connected together through an MWD cable, the decoding circuit and the motor control circuit and the MWD downhole instrument are electrically connected with the single-chip microcomputer respectively, the micro motor is a stepping motor with an optical encoder, the stepping motor is electrically connected with the motor control circuit, the battery of the MWD downhole instrument is electrically connected with the decoding circuit, the single-chip microcomputer, the motor control circuit and the stepping motor to supply power for them.

[0008] The lower end of the variable diameter joint can be threadedly connected with a lower joint, the inner side of the variable diameter joint corresponding to the position below the connecting joint and the position above the lower joint is fixedly and sealingly installed with a sealing ring, the upper part and the lower part of the moving column are slidingly and sealingly installed inside the upper and lower sealing rings respectively, the outer side of the moving column corresponding to the position above the lower sealing ring is sealingly sleeved with a lower float, the inner side of the variable diameter joint corresponding to the position of the lower float is provided with a float installation ring groove, the lower float is slidingly and sealingly installed in the float installation ring groove, the variable diameter joint corresponding to the position between the lower float and the lower sealing ring is provided with a pressure balance hole penetrating through the inside and the outside.

[0009] The inside of the moving column can be provided with a center flow channel penetrating through the upper and lower parts, the inside of the connecting sleeve corresponding to the position above the moving column is slidingly and sealingly installed with an internal float, the outer side of the middle part of the moving column is vertically provided with a guide groove, the variable diameter joint corresponding to the position of the guide groove is threadedly connected with a limiting screw, the inner end of the limiting screw is located inside the guide groove.

[0010] The inner end of the guide column can be provided with an inclined surface matched with the continuous inclined surface, the inner end of the guide column is in contact with the continuous inclined surface, the guide column and the guide hole are provided with a sealing ring for sealing the gap therebetween.

[0011] The sealing rings can be arranged between the inner float and the connecting sleeve, between the lower float and the inner wall of the float mounting ring groove, and between the lower float and the moving column.

[0012] The present application has reasonable and compact structure, and is convenient to use. The driving mechanism and the inclined surface of the moving column drive the centralizing block to extend outward. The distance of the extension of the centralizing block is fed back to the operator on the ground in real time through the control system, so that the operator can clearly know the working state of the variable-diameter stabilizer, and the accurate variable-diameter purpose is achieved. The present application has the characteristics of safety, stability and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is a schematic diagram of the upper main view of the structure of the best embodiment of the present application.

[0014] BRIEF DESCRIPTION OF DRAWINGS Figure 2 It is a schematic diagram of the lower main view of the structure of the best embodiment of the present application.

[0015] BRIEF DESCRIPTION OF DRAWINGS Figure 3 It is a control principle block diagram of the best embodiment of the present application.

[0016] The codes in the drawings are as follows: 1 is a variable-diameter joint, 2 is a connecting joint, 3 is a non-magnetic drill collar, 4 is a centralizing block, 5 is a limiting ring, 6 is a reset spring, 7 is a connecting column, 8 is a guide column, 9 is a moving column, 10 is a continuous inclined surface, 11 is a micro motor, 12 is a transmission screw, 13 is a screw nut, 14 is an extended sleeve rod, 15 is a connecting sleeve, 16 is a protective sleeve, 17 is an instrument protection casing, 18 is a MWD downhole instrument, 19 is a lower joint, 20 is a sealing ring, 21 is a lower float, 22 is a pressure balance hole, 23 is an inner float, 24 is a guide groove, 25 is a limiting screw, 26 is a sealing ring, 27 is a pulse decoding circuit, 28 is a single-chip microcomputer, 29 is a motor control circuit, 30 is an optical encoder, 31 is a MWD uphole instrument, and 32 is a mud pump. DETAILED DESCRIPTION

[0017] The present application is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the present application and the actual situation.

[0018] In the present application, the relative position relationship of each component is described according to the layout mode of the drawings attached to the specification, for example, the position relationship of front, back, top, bottom, left and right is determined according to the layout direction of the drawings attached to the specification. Figure 2

[0019] The present application will be further described below in combination with embodiments and drawings:

[0020] As shown in the drawings, Figure 1 , 2 ​The application discloses a kind of intelligent control type variable diameter stabilizer, as shown in Fig. 3, including variable diameter mechanism, drive mechanism and from top to bottom are screwed together non-magnetic drill collar 3, connecting joint 2 and variable diameter joint 1, the variable diameter mechanism includes three centralizing blocks 4 that are evenly distributed on the outside of variable diameter joint 1 along the circumference of variable diameter joint 1 and moving column 9 that is slidingly installed inside variable diameter joint 1, two installation ring grooves are provided on the outside of the middle part of variable diameter joint 1, the upper and lower ends of centralizing block 4 are provided with arc-shaped installation table matched with installation ring groove, centralizing block 4 is slidingly installed in installation ring groove through installation table, a limiting ring 5 is fixedly installed on the outside of variable diameter joint 1 corresponding to the position of installation table to prevent installation table from sliding out of installation ring groove, a return spring 6 is provided between installation table and its corresponding limiting ring 5, a connecting column 7 is provided in the middle of centralizing block 4, a guide hole is provided on variable diameter joint 1 corresponding to the position of connecting column 7, a guide column 8 is slidingly installed in the guide hole, an installation hole is provided on the outer end of guide column 8 matched with connecting column 7, connecting column 7 is inserted into installation hole, a continuous slope 10 is provided on the outside of moving column 9 corresponding to the inner end position of guide column 8 to drive centralizing block 4 to move outward, a drive mechanism is provided in the inside of connecting joint 2 corresponding to the position above moving column 9 to drive moving column 9 to move up and down, the upper end of moving column 9 is in transmission connection with the drive mechanism, a control system is provided in the inside of non-magnetic drill collar 3 corresponding to the position above the drive mechanism to control the movement of the drive mechanism and to feed the extension distance of centralizing block 4 to the ground operator, the drive mechanism is electrically connected with the control system.

[0021] According to the need, the continuous slope 10 is a taper surface with large upper part and small lower part, and the maximum diameter of the continuous slope 10 is slightly smaller than the inner diameter of variable diameter joint 1, the inner end of guide column 8 is in contact with the minimum diameter of continuous slope 10 in the initial state, and the inside of centralizing block 4 is in contact with the inside of variable diameter joint 1 under the elastic force of return spring 6. In use, the application is installed on the pipeline in the well, the movement of the drive mechanism is controlled through the control system, and then the drive mechanism drives moving column 9 to move downward, the continuous slope 10 on moving column 9 drives centralizing block 4 to move outward to realize the action of variable diameter, and the extension distance of centralizing block 4 is fed to the ground operator through the control system for adjustment, after the variable diameter is finished, the drive mechanism is controlled by the control system to drive moving column 9 to rise, and under the elastic force of return spring 6, centralizing block 4 returns to the initial position. The application has reasonable and compact structure, and is convenient to use, the drive mechanism and the slope of moving column 9 drive centralizing block 4 to extend outward, the extension distance of centralizing block 4 is fed to the ground operator in real time through the control system, the extension distance of centralizing block 4 can be accurately controlled, and the operator can clearly know the working state of the variable diameter stabilizer, the purpose of accurate variable diameter is realized, and the application has the characteristics of safety, stability and high efficiency.

[0022] According to the need, the continuous slope 10 is a taper surface with large upper part and small lower part, and the maximum diameter of the continuous slope 10 is slightly smaller than the inner diameter of variable diameter joint 1, the inner end of guide column 8 is in contact with the minimum diameter of continuous slope 10 in the initial state, and the inside of centralizing block 4 is in contact with the inside of variable diameter joint 1 under the elastic force of return spring 6. In use, the application is installed on the pipeline in the well, the movement of the drive mechanism is controlled through the control system, and then the drive mechanism drives moving column 9 to move downward, the continuous slope 10 on moving column 9 drives centralizing block 4 to move outward to realize the action of variable diameter, and the extension distance of centralizing block 4 is fed to the ground operator through the control system for adjustment, after the variable diameter is finished, the drive mechanism is controlled by the control system to drive moving column 9 to rise, and under the elastic force of return spring 6, centralizing block 4 returns to the initial position. The application has reasonable and compact structure, and is convenient to use, the drive mechanism and the slope of moving column 9 drive centralizing block 4 to extend outward, the extension distance of centralizing block 4 is fed to the ground operator in real time through the control system, the extension distance of centralizing block 4 can be accurately controlled, and the operator can clearly know the working state of the variable diameter stabilizer, the purpose of accurate variable diameter is realized, and the application has the characteristics of safety, stability and high efficiency.

[0023] As shown in the accompanying drawings Figure 1 , 2 The driving mechanism includes a micro motor 11 fixedly installed inside the connecting joint 2, a transmission screw rod 12 fixedly installed on the output shaft of the micro motor 11, a screw nut 13 installed on the transmission screw rod 12, and an extended sleeve rod 14 sleeved outside the transmission screw rod 12. The upper end of the extended sleeve rod 14 is fixedly connected with the lower end of the screw nut 13, and the lower end of the extended sleeve rod 14 is fixedly installed with a connecting sleeve 15. The lower end of the connecting sleeve 15 is threadedly connected with the upper end of the moving column 9. A protective sleeve 16 is sleeved outside the micro motor 11, the transmission screw rod 12, the screw nut 13, and the connecting sleeve 15. An internal float 23 is slidingly and sealingly installed inside the connecting sleeve 15 corresponding to the position above the moving column 9. In use, the micro motor 11 drives the transmission screw rod 12 to rotate, and then the screw nut 13 moves up and down along the axial direction, thereby driving the extended sleeve rod 14 and the moving column 9 to move up and down. The transmission screw rod 12 and the screw nut 13 ensure the accuracy of movement, and the protective sleeve 16 prevents the components of the driving mechanism from being corroded by mud.

[0024] As shown in the accompanying drawings Figure 1 , 3 The internal float 23 is slidingly and sealingly installed inside the connecting sleeve 15 corresponding to the position above the moving column 9. In use, the micro motor 11 drives the transmission screw rod 12 to rotate, and then the screw nut 13 moves up and down along the axial direction, thereby driving the extended sleeve rod 14 and the moving column 9 to move up and down. The transmission screw rod 12 and the screw nut 13 ensure the accuracy of movement, and the protective sleeve 16 prevents the components of the driving mechanism from being corroded by mud. The internal float 23 is slidingly and sealingly installed inside the connecting sleeve 15 corresponding to the position above the moving column 9. In use, the micro motor 11 drives the transmission screw rod 12 to rotate, and then the screw nut 13 moves up and down along the axial direction, thereby driving the extended sleeve rod 14 and the moving column 9 to move up and down. The transmission screw rod 12 and the screw nut 13 ensure the accuracy of movement, and the protective sleeve 16 prevents the components of the driving mechanism from being corroded by mud. The internal float 23 is slidingly and sealingly installed inside the connecting sleeve 15 corresponding to the position above the moving column 9. In use, the micro motor 11 drives the transmission screw rod 12 to rotate, and then the screw nut 13 moves up and down along the axial direction, thereby driving the extended sleeve rod 14 and the moving column 9 to move up and down. The transmission screw rod 12 and the screw nut 13 ensure the accuracy of movement, and the protective sleeve 16 prevents the components of the driving mechanism from being corroded by mud. The internal float 23 is slidingly and sealingly installed inside the connecting sleeve 15 corresponding to the position above the moving column 9. In use, the micro motor 11 drives the transmission screw rod 12 to rotate, and then the screw nut 13 moves up and down along the axial direction, thereby driving the extended sleeve rod 14 and the moving column 9 to move up and down. The transmission screw rod 12 and the screw nut 13 ensure the accuracy of movement, and the protective sleeve 16 prevents the components of the driving mechanism from being corroded by mud. The internal float 23 is slidingly and sealingly installed inside the connecting sleeve 15 corresponding to the position above the moving column 9. In use, the micro motor 11 drives the transmission screw rod 12 to rotate, and then the screw nut 13 moves up and down along the axial direction, thereby driving the extended sleeve rod 14 and the moving column 9 to move up and down. The transmission screw rod 12 and the screw nut 13 ensure the accuracy of movement, and the protective sleeve 16 prevents the components of the driving mechanism from being corroded by mud.

[0025] The MWD instrument and the MWD downhole instrument 18 and the MWD uphole instrument 31 are all prior art, and the pulse decoding circuit 27 and the motor control circuit 29 are all prior art. In use, the ground operator sequentially starts and stops the mud pump 32 to generate a pulse signal, the pulse signal is transmitted to the pulse decoding circuit 27 of the control system and is converted into an electrical signal and transmitted to the single-chip microcomputer 28, the single-chip microcomputer 28 controls the number of rotations of the output shaft of the micro motor 11, the optical encoder on the micro motor 11 sends the number of rotations of the output shaft to the single-chip microcomputer 28 in real time, the single-chip microcomputer 28 controls the opening and closing of the valve of the MWD downhole instrument 18 to generate a pulse signal, the pulse signal is transmitted to the MWD uphole instrument 31 so that the operator can know the number of rotations of the micro motor 11, and the number of rotations of the micro motor 11 is converted into the moving distance of the screw nut to calculate the extending distance of the stabilizing block 4. The instrument protection sleeve 17 can effectively prevent the mud from damaging the MWD downhole instrument 18 and the related circuit, and ensure the reliability of use.

[0026] As shown in the accompanying drawings, Figure 2 The lower end of the variable diameter joint 1 is screwed with a lower joint 19, and the inner side of the variable diameter joint 1 corresponding to the position above the lower joint 19 and the position below the connection joint 2 is fixedly and sealingly installed with a sealing ring 20, the upper part and the lower part of the moving column 9 are sealingly and slidingly installed in the upper and lower sealing rings 20 respectively, the outer side of the moving column 9 corresponding to the position above the lower sealing ring 20 is sealingly sleeved with a lower float plug 21, the inner side of the variable diameter joint 1 corresponding to the position of the lower float plug 21 is provided with a float plug installation ring groove, the lower float plug 21 is slidingly and sealingly installed in the float plug installation ring groove, and the variable diameter joint 1 is provided with a pressure balance hole 22 penetrating through the inside and the outside corresponding to the position between the lower float plug 21 and the lower sealing ring 20. According to the need, the sealing ring 20 and the lower float plug 21 are both prior art, and the lower float plug 21 and the pressure balance hole 22 are set to balance the internal and external pressure of the variable diameter joint 1 when the moving column 9 moves, prevent pressure from being blocked, and affect the feedback operation of the operator.

[0027] As shown in the accompanying drawings, Figure 2 The inside of the moving column 9 is provided with a center flow channel penetrating through the upper and lower parts, the inside of the connection sleeve 15 corresponding to the position above the moving column 9 is slidingly and sealingly installed with an inner float plug 23, the outer side of the middle part of the moving column 9 is vertically provided with a guide groove 24, the variable diameter joint 1 corresponding to the position of the guide groove 24 is screwed with a limiting screw 25, and the inner end of the limiting screw 25 is located in the guide groove 24. The limiting screw 25 and the guide groove 24 are set on the variable diameter joint 1 and the moving column 9 respectively to prevent the moving column 9 from rotating when moving, and the inner float plug 23 is set to balance the internal pressure of the connection sleeve 15 and reduce the resistance of the moving column 9.

[0028] As shown in the accompanying drawings, Figure 2As shown, the inner end of the guide column 8 is provided with a slope matched with the continuous slope 10, the inner end of the guide column 8 is in contact with the continuous slope 10, and a sealing ring 26 is arranged between the guide column 8 and the guide hole for sealing the gap therebetween. By arranging the slope matched with the continuous slope 10 at the inner end of the guide column 8, the moving of the centralizing block 4 is more stable, and the wear of the inner end of the guide column 8 and the continuous slope 10 is reduced.

[0029] As shown in the accompanying drawings, the inner end of the guide column 8 is provided with a slope matched with the continuous slope 10, the inner end of the guide column 8 is in contact with the continuous slope 10, and a sealing ring 26 is arranged between the guide column 8 and the guide hole for sealing the gap therebetween. By arranging the slope matched with the continuous slope 10 at the inner end of the guide column 8, the moving of the centralizing block 4 is more stable, and the wear of the inner end of the guide column 8 and the continuous slope 10 is reduced. Figure 2 As shown, the inner end of the guide column 8 is provided with a slope matched with the continuous slope 10, the inner end of the guide column 8 is in contact with the continuous slope 10, and a sealing ring 26 is arranged between the guide column 8 and the guide hole for sealing the gap therebetween. By arranging the slope matched with the continuous slope 10 at the inner end of the guide column 8, the moving of the centralizing block 4 is more stable, and the wear of the inner end of the guide column 8 and the continuous slope 10 is reduced.

[0030] The above technical features constitute the best embodiment of the present application, which has strong adaptability and optimal implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A smart control type variable diameter stabilizer, characterized in that... The device includes a diameter-changing mechanism, a drive mechanism, and a non-magnetic drill collar, a connecting joint, and a diameter-changing connector connected sequentially from top to bottom. The diameter-changing mechanism includes three straightening blocks evenly distributed around the outside of the diameter-changing connector and a movable column slidably installed inside the diameter-changing connector. Two mounting ring grooves are spaced vertically on the outer side of the middle portion of the diameter-changing connector. Each straightening block has an arc-shaped mounting platform at both its upper and lower ends that mates with the mounting ring groove. The straightening block is slidably installed in the mounting ring groove via the mounting platform. A limiting ring is fixedly installed on the outer side of the diameter-changing connector corresponding to the mounting platform position to prevent the mounting platform from sliding out of the mounting ring groove. A return spring is provided between the mounting platform and its corresponding limiting ring. A connecting column is located in the middle of the straightening block, and a through guide hole is provided on the diameter-changing connector corresponding to the connecting column position. A guide post is slidably installed inside the guide post. The outer end of the guide post has a mounting hole that mates with a connecting post. The connecting post is inserted into the mounting hole. A continuous inclined surface is provided on the outer side of a movable post corresponding to the inner end of the guide post, used to drive the straightening block to move outward. A drive mechanism is located inside the connecting joint above the movable post, used to move the movable post up and down. The upper end of the movable post is connected to the drive mechanism. A control system is located inside the non-magnetic drill collar above the drive mechanism, used to control the movement of the drive mechanism and to provide feedback on the extension distance of the straightening block to the ground operator. The drive mechanism is electrically connected to the control system. The drive mechanism includes a micro motor fixedly installed inside the connecting joint. A transmission screw is fixedly installed on the output shaft of the micro motor, and a screw nut is installed on the transmission screw. An extended sleeve is fitted around the lead screw, with its upper end fixedly connected to the lower end of the lead screw nut. A connecting sleeve is fixedly installed at the lower end of the extended sleeve, and its lower end is threadedly connected to the upper end of the moving column. A protective sleeve is fitted around the micro motor, enclosing the micro motor, lead screw, lead screw nut, and connecting sleeve. An instrument protective sleeve is located inside the non-magnetic drill collar above the protective sleeve, with its lower end screwed to the upper end of the protective sleeve. The control system includes a pulse decoding circuit, a microcontroller, a motor control circuit, and an MWD instrument. The MWD instrument includes a downhole MWD instrument installed inside the instrument protective sleeve and a surface MWD instrument placed on the surface. The downhole and surface MWD instruments communicate via MWD. The cables are electrically connected together. The pulse decoding circuit, motor control circuit, and MWD downhole instrument are each electrically connected to the microcontroller. The micro motor is a stepper motor with a photoelectric encoder. The stepper motor and motor control circuit are electrically connected. The battery of the MWD downhole instrument is electrically connected to the pulse decoding circuit, microcontroller, motor control circuit, and stepper motor to supply power. The lower end of the reducing connector is screwed with a lower connector. Sealing rings are fixedly and sealed on the inner side of the reducing connector at the position below the connecting connector and the position above the lower connector. The upper and lower parts of the moving column are slidably and sealed in the upper and lower sealing rings, respectively. A lower float plug is fitted on the outer sealing sleeve of the moving column at the position above the lower sealing ring. A float plug mounting ring groove is provided on the inner side of the reducing connector at the position of the lower float plug.The lower float plug sliding seal is installed in the float plug mounting ring groove, and the reducing joint corresponding to the position between the lower float plug and the lower sealing ring is provided with an internal and external through pressure balance hole.

2. The intelligent control type variable diameter stabilizer according to claim 1, characterized in that... The moving column has a central flow channel that runs vertically through it. The connecting sleeve at the upper position of the moving column has an internal float plug that is slidably sealed inside. A guide groove is vertically provided on the outer side of the middle part of the moving column. A limit screw is screwed onto the reducing joint at the position of the guide groove, and the inner end of the limit screw is located in the guide groove.

3. The intelligent control type variable diameter stabilizer according to claim 1 or 2, characterized in that... The inner end of the guide post is provided with an inclined surface that matches the continuous inclined surface. The inner end of the guide post is in contact with the continuous inclined surface. A sealing ring is provided between the guide post and the guide hole to seal the gap between them.

4. The intelligent control type variable diameter stabilizer according to claim 2, characterized in that... Sealing rings are provided between the internal float and the connecting sleeve, between the lower float and the inner wall of the float mounting ring groove, and between the lower float and the moving column.

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