Closed-loop electric control variable-diameter stabilizer

Abstract

The invention relates to the field of petroleum drilling equipment, in particular to a closed-loop electric control variable-diameter stabilizer, and aims to relieve the technical problem of low stretching precision of a centralizing block in related technologies. According to the closed-loop electric control variable-diameter stabilizer, a dovetail block is fixedly connected with a centralizing block and can slide along with the centralizing block in the direction perpendicular to the axis of a variable-diameter body, a dovetail sleeve is in sliding fit with the variable-diameter body and can slide in the axial direction of the variable-diameter body, and the dovetail sleeve and the dovetail block form a wedge mechanism, so that when a driving assembly drives the dovetail sleeve to slide, the dovetail sleeve can slide along with the axis of the variable-diameter body; the dovetail block slides correspondingly, the dovetail sleeve is matched with the dovetail block, axial movement is changed into radial movement, and therefore the centralizing block is driven to expand or shrink correspondingly. According to the closed-loop electronic control variable-diameter stabilizer, axial movement is changed into radial movement to drive the centralizing block to stretch out and draw back in the radial direction, compared with the mode that stretching out and drawing back of the centralizing block are controlled through a spring in the prior art, the closed-loop electronic control variable-diameter stabilizer can accurately meet the orientation requirement under multiple conditions, operation is easy, and meanwhile efficiency and safety are achieved.

Description

Technical Field

[0001] The invention relates to the field of oil drilling equipment, in particular to a closed-loop electrically controlled variable-diameter stabilizer. Background Art

[0002] In horizontal wells, ultra-deep wells and large-reach drilling technologies, tools are needed to assist in drilling orientation. Orientation using tools such as bent joints requires multiple trips in and out of the well according to the drilling parameters, and the drilling cycle is long. Orientation using rotary steerable tools is highly accurate but expensive. The control signal of the variable diameter stabilizer is generally a mud pulse. Through the action of mechanical force and hydraulic pressure, the variable diameter block achieves radial expansion and contraction to achieve the purpose of diameter change. The key technology of the variable diameter stabilizer is the expansion and contraction of the straightening block. If the expansion and contraction accuracy is poor, such as using a spring to control the expansion and contraction of the straightening block, the reliability and efficiency of the variable diameter stabilizer will be low. Summary of the invention

[0003] The object of the present invention is to provide a closed-loop electrically controlled variable diameter stabilizer to alleviate the technical problem of low telescopic accuracy of the straightening block in the related art.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] The closed-loop electrically controlled variable diameter stabilizer provided by the present invention comprises: a variable diameter assembly and a driving assembly;

[0006] The reducer assembly includes a reducer body, a straightening block, a dovetail block and a dovetail sleeve;

[0007] The diameter-changing body is cylindrical and is provided with a plurality of hollow holes penetrating its side wall, and the plurality of hollow holes are evenly distributed around the axis of the diameter-changing body;

[0008] The straightening blocks correspond to the hollow holes one by one, are arranged in the hollow holes, and can move in a direction perpendicular to the axis of the variable diameter body;

[0009] The dovetail blocks correspond to the straightening blocks one by one, are fixedly connected to the straightening blocks, and are located between the straightening blocks;

[0010] The dovetail sleeve is located in the diameter-changing body and is slidably matched with the diameter-changing body. The dovetail sleeve is also plug-matched with the dovetail blocks, located between the dovetail blocks, and forms an inclined wedge mechanism with the dovetail blocks.

[0011] The driving assembly is arranged in the diameter-changing body and is drivingly connected with the dovetail sleeve to drive the dovetail sleeve to slide along the axial direction of the diameter-changing body.

[0012] Furthermore, the dovetail block is divided into two sub-dovetail blocks, and the two sub-dovetail blocks are spaced apart along the axial direction of the variable diameter body;

[0013] The dovetail sleeve is divided into an upper dovetail sleeve and a lower dovetail sleeve. Along the axial direction of the diameter-changing body, the upper dovetail sleeve and the lower dovetail sleeve are spaced apart, and one of them is inserted and matched with one of the sub-dovetail blocks, and the other is inserted and matched with the other sub-dovetail block.

[0014] Furthermore, the drive assembly includes an electric control mechanism;

[0015] The electric control mechanism includes an electric control cavity, a brushless motor, a transmission core shaft, and a transmission nut;

[0016] The electric control cavity is threadedly connected to the upper dovetail sleeve;

[0017] The brushless motor is arranged in the electric control cavity, and its output shaft is fixedly connected to the transmission core shaft;

[0018] The transmission core shaft passes through the upper dovetail sleeve and the lower dovetail sleeve;

[0019] The transmission nut is sleeved on the transmission core shaft and fixedly connected to the transmission core shaft to rotate with the transmission core shaft;

[0020] The lower dovetail sleeve is sleeved on the transmission nut and threadedly connected to the transmission nut.

[0021] Furthermore, the electric control mechanism further includes a clamp and a compression cap;

[0022] The transmission nut is key-connected to the transmission core shaft;

[0023] The clamp is embedded on the side surface of the transmission core shaft and contacts the end surface of the transmission nut;

[0024] The compression cap is threadedly connected to the end of the transmission core shaft, and its inner wall abuts against the outer wall of the clamp.

[0025] Furthermore, a bearing is arranged in the upper dovetail sleeve, and the transmission core shaft passes through the bearing and is in transitional fit with the bearing.

[0026] Furthermore, the electric control mechanism further includes a high-temperature battery, and the high-temperature battery is arranged in the electric control cavity and electrically connected to the brushless motor.

[0027] Furthermore, the drive assembly further includes a sensing mechanism;

[0028] The sensing mechanism includes a sensor, and the sensor is communicatively connected to the brushless motor and is used for receiving the pulse signal transmitted by the mud pump.

[0029] Furthermore, the sensing mechanism further includes a base and a sensing cavity;

[0030] The sensing cavity is cylindrical, one end of which is fixedly connected to the base, and the other end of which is fixedly connected to the electric control cavity;

[0031] The sensor is arranged in a space enclosed by the base and the sensing cavity.

[0032] Furthermore, along the axial direction of the reducer body, the reducer body is divided into an upper joint, a reducer section and a lower joint;

[0033] The two ends of the reducing section are respectively threadedly connected to the upper joint and the lower joint;

[0034] Along the axial direction of the diameter-changing section, a bypass flow channel is provided on the side wall of the diameter-changing section, and the bypass flow channel is communicated with the lower joint.

[0035] Furthermore, a piston is inserted into the end of the reducing section close to the lower joint, and a retaining ring is provided on the piston sleeve. The retaining ring is embedded in the inner wall of the reducing section to limit the piston from sliding out of the reducing section in the axial direction of the reducing section.

[0036] In summary of the above technical solutions, the technical effects that can be achieved by the closed-loop electronically controlled variable diameter stabilizer provided by the present invention are:

[0037] The closed-loop electrically controlled variable diameter stabilizer comprises a variable diameter assembly and a driving assembly; the variable diameter assembly comprises a variable diameter body, a straightening block, a dovetail block and a dovetail sleeve; the variable diameter body is cylindrical and is provided with a plurality of hollow holes penetrating its side wall, and the plurality of hollow holes are evenly spaced around the axis of the variable diameter body; the straightening blocks correspond one to one with the hollow holes, are arranged in the hollow holes, and can move in a direction perpendicular to the axis of the variable diameter body; the dovetail blocks correspond one to one with the straightening blocks, are fixedly connected with the straightening blocks, and are located between the straightening blocks; the dovetail sleeve is located in the variable diameter body, and is slidably matched with the variable diameter body, the dovetail sleeve is also plug-matched with the dovetail blocks, is located between the dovetail blocks, and forms an inclined wedge mechanism with each dovetail block; the driving assembly is arranged in the variable diameter body, and is transmission-connected with the dovetail sleeve to drive the dovetail sleeve to slide along the axial direction of the variable diameter body.

[0038] In the closed-loop electrically controlled variable diameter stabilizer, the dovetail block is fixedly connected to the straightening block and can slide along the direction perpendicular to the axis of the variable diameter body with the straightening block. The dovetail sleeve is slidably matched with the variable diameter body and can slide along the axial direction of the variable diameter body. The dovetail sleeve and the dovetail block form an inclined wedge mechanism. In this way, when the driving assembly drives the dovetail sleeve to slide, the dovetail block slides accordingly. Here, the dovetail sleeve cooperates with the dovetail block to change the axial movement into radial movement, thereby driving the straightening block to expand or shrink the diameter accordingly.

[0039] It can be seen that the closed-loop electronically controlled variable-diameter stabilizer drives the centralizer to expand and contract radially by changing axial movement into radial movement. Compared with the prior art in which the expansion and contraction of the centralizer is controlled by a spring, this design can accurately meet the directional requirements in various situations, and is simple to operate, efficient and safe at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is a cross-sectional view of the closed-loop electronically controlled variable-diameter stabilizer provided by an embodiment of the present invention;

[0042] Figures 2 to 4 is Figure 1 a schematic diagram of each section from top to bottom;

[0043] Figure 5 It is a sectional view of the closed-loop electronically controlled variable-diameter stabilizer provided by an embodiment of the present invention.

[0044] Reference numerals: 1 - variable-diameter body; 101 - upper sub; 102 - variable-diameter section; 103 - lower sub;

[0045] 2 - centralizer;

[0046] 3 - dovetail block; 301 - male dovetail block;

[0047] 4 - dovetail sleeve; 401 - upper dovetail sleeve; 402 - lower dovetail sleeve;

[0048] 5 - electronically controlled cavity; 6 - brushless motor; 7 - drive mandrel; 8 - drive nut; 9 - clamp; 10 - compression nut; 11 - bearing; 12 - high-temperature battery; 13 - sensor; 14 - base; 15 - sensing cavity; 16 - piston; 17 - snap ring; 18 - sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0052] In horizontal wells, ultra-deep wells and large-reach drilling technologies, tools are needed to assist in drilling orientation. Orientation using tools such as bent joints requires multiple trips in and out of the well according to the drilling parameters, and the drilling cycle is long. Orientation using rotary steerable tools is highly accurate but expensive. The control signal of the variable diameter stabilizer is generally a mud pulse. Through the action of mechanical force and hydraulic pressure, the variable diameter block achieves radial expansion and contraction to achieve the purpose of diameter change. The key technology of the variable diameter stabilizer is the expansion and contraction of the straightening block. If the expansion and contraction accuracy is poor, such as using a spring to control the expansion and contraction of the straightening block, the reliability and efficiency of the variable diameter stabilizer will be low.

[0053] In view of this, the present invention provides a closed-loop electrically controlled variable diameter stabilizer, comprising a variable diameter assembly and a driving assembly; the variable diameter assembly comprises a variable diameter body 1, a straightening block 2, a dovetail block 3 and a dovetail sleeve 4; the variable diameter body 1 is cylindrical and is provided with a plurality of hollow holes penetrating its side wall, and the plurality of hollow holes are evenly spaced around the axis of the variable diameter body 1; the straightening block 2 corresponds to the hollow holes one by one, is arranged in the hollow holes, and can move in a direction perpendicular to the axis of the variable diameter body 1; the dovetail block 3 corresponds to the straightening block 2 one by one, is fixedly connected to the straightening block 2, and is located between the straightening blocks 2; the dovetail sleeve 4 is in the variable diameter body 1, and is slidably matched with the variable diameter body 1, the dovetail sleeve 4 is also plug-fitted with the dovetail block 3, is located between the dovetail blocks 3, and forms an inclined wedge mechanism with each dovetail block 3; the driving assembly is arranged in the variable diameter body 1, and is transmission-connected with the dovetail sleeve 4 to drive the dovetail sleeve 4 to slide along the axial direction of the variable diameter body 1.

[0054] In the closed-loop electrically controlled variable diameter stabilizer, the dovetail block 3 is fixedly connected to the straightening block 2 and can slide along the direction perpendicular to the axis of the variable diameter body 1 with the straightening block 2. The dovetail sleeve 4 is slidably matched with the variable diameter body 1 and can slide along the axial direction of the variable diameter body 1. The dovetail sleeve 4 and the dovetail block 3 form an inclined wedge mechanism. In this way, when the driving assembly drives the dovetail sleeve 4 to slide, the dovetail block 3 slides accordingly. Here, the dovetail sleeve 4 cooperates with the dovetail block 3 to change the axial movement into radial movement, thereby driving the straightening block 2 to expand or shrink the diameter accordingly.

[0055] It can be seen that the closed-loop electronically controlled variable-diameter stabilizer drives the centralizer 2 to expand and contract radially by changing axial movement into radial movement. Compared with the prior art where the expansion and contraction of the centralizer 2 are controlled by springs, this design can accurately meet the directional requirements in various situations, and is simple to operate, efficient, and safe.

[0056] The following will combine Figures 1 to 5 to elaborate in detail on the structure and shape of the closed-loop electronically controlled variable-diameter stabilizer provided in this embodiment:

[0057] Referring to Figures 1 to 5 , the variable-diameter assembly further includes a piston 16. The variable-diameter body 1 is successively divided into an upper sub-joint 101, a variable-diameter section 102, and a lower sub-joint 103 from top to bottom. The dovetail block 3 is divided into two sub-dovetail blocks 301, and the dovetail sleeve 4 is divided into an upper dovetail sleeve 401 and a lower dovetail sleeve 402. The drive assembly includes a sensing mechanism and an electronic control mechanism. Among them, the sensing mechanism includes a sensor 13, a base 14, and a sensing cavity 15; the electronic control mechanism includes an electronic control cavity 5, a brushless motor 6, a transmission mandrel 7, a transmission nut 8, a bearing 11, and a high-temperature battery 12.

[0058] Regarding the variable-diameter assembly, specifically:

[0059] Referring to Figures 1 to 4 , the upper end of the variable-diameter section 102 is threadedly connected to the lower end of the upper sub-joint 101, and the lower end of the variable-diameter section 102 is threadedly connected to the upper end of the lower sub-joint 103; the upper dovetail sleeve 401 and the lower dovetail sleeve 402 are respectively dovetail inserted and overlapped with the upper sub-dovetail block 301 and the lower sub-dovetail block 301; the centralizer 2 is placed on two corresponding axial sub-dovetail blocks 301 and is in end face contact with them. The sub-dovetail block 301 and the centralizer 2 are connected into one body by connecting bolts and are placed in the hollow hole of the variable-diameter section 102.

[0060] Continuing from the above, sealing rings 18 are provided between the outer diameter of the upper dovetail sleeve 401 and the inner diameter of the variable-diameter section 102, between the outer diameter of the lower dovetail sleeve 402 and the inner diameter of the variable-diameter section 102, between the inner diameter of the upper dovetail sleeve 401 and the outer diameter of the transmission mandrel 7, and between the inner diameter of the lower dovetail sleeve 402 and the outer diameter of the transmission mandrel 7. A sealing ring 18 is also provided on the threaded connection surface between the lower sub-joint 103 and the variable-diameter section 102.

[0061] Continuing from the above, the piston 16 is placed at the lower end of the variable-diameter section 102, and the snap ring 17 is placed in the lower groove of the variable-diameter section 102, and its upper end is in contact with the live step surface. A sealing ring 18 is also provided between the contact surface of the variable-diameter section 102 and the piston 16.

[0062] Regarding the sensing mechanism, specifically:

[0063] Referring to Figures 1 to 4, a sealing ring 18 is provided between the outer diameter of the base 14 and the inner diameter of the sensing cavity 15, and between the outer diameter of the sensing cavity 15 and the inner diameter of the electronic control cavity 5. The base 14 and the sensor 13 are placed inside the sensing cavity 15. The lower end face of the base 14 is limited by the step inside the sensing cavity 15, and the snap ring 17 limits the step surface of the base 14. The lower end of the sensing cavity 15 is placed inside the electronic control cavity 5, and its lower end contacts the step surface inside the electronic control cavity 5 and is limited by another snap ring 17.

[0064] Regarding the electronic control mechanism, specifically:

[0065] Refer to Figures 1 to 4 , the high-temperature battery 12 is located inside the electronic control cavity 5, with the sensing cavity 15 at its upper end and the brushless motor 6 at its lower end; the bearing 11 is placed at the lower end of the electronic control cavity 5, the drive core shaft 7 passes through the bearing 11, and its upper end is key-connected to the brushless motor 6; the drive nut 8 is threadedly connected to the lower end of the lower dovetail block 3 and is connected to the drive core shaft 7 through a connection key; the clamp 9 is placed at the lower part of the drive core shaft 7 and contacts the lower end surface of the drive nut 8, and the compression cap 10 is threadedly connected to the lower end of the drive core shaft 7, and its inner wall contacts the outer wall of the clamp 9. It should also be added here that the lower end of the electronic control cavity 5 is threadedly connected to the upper end of the upper dovetail sleeve 401, and a sealing ring 18 is also provided between their contact surfaces.

[0066] With the above design, the variable diameter range of the centralizer 2 is 206mm - 212mm, and the radial expansion and contraction of the centralizer 2 are controlled by the thread pitch. Compared with the spring control of the expansion and contraction of the centralizer 2, this design can accurately meet the directional requirements in multiple situations, and is simple, efficient and safe to operate. In addition, the variable diameter control signal comes from the sensor 13, not directly from the drilling fluid, eliminating the influence of the instability of the drilling fluid on the signal. Here, the sensor 13 can accurately receive and transmit liquid pulse signals, and its circuit board can issue secondary instructions. The primary instruction drives the electronic control mechanism to act, and the secondary instruction details actions including torque, torsion, etc., to achieve smooth and accurate expansion and contraction of the centralizer 2.

[0067] The working process of the closed-loop electronically controlled variable diameter stabilizer provided by this embodiment is as follows:

[0068] This closed-loop electronically controlled variable diameter stabilizer includes three components, namely: a sensing mechanism, an electronic control mechanism and a variable diameter assembly; the sensing mechanism receives mud pulse signals and sends instructions to the electronic control mechanism, and the high-temperature battery 12 is used to provide energy; the variable diameter assembly completes specified actions according to the instructions.

[0069] Among them, along the axial direction of the variable diameter section 102, a bypass flow channel is provided on the side wall of the variable diameter section 102, such as Figure 5As shown, after the mud enters the bottom hole assembly, it flows towards the drill bit through the bypass channel on the reduced-diameter section 102, realizing the circulation of the drilling mud. More preferably, there are 4 hollow holes on the reduced-diameter section 102, and the centralizer 2 is placed therein.

[0070] In specific applications, the central inner cavity of the closed-loop electronically controlled variable-diameter stabilizer forms a sealed space. The mud pump transmits a pulse signal to the bottom hole assembly. The sensor 13 first receives the signal and transmits it to the motor. The transmitted signals are divided into two types. One is to control the centralizer 2 to radially extend and expand the outer diameter; the other is to control the centralizer 2 to radially retract and reduce the outer diameter. The signal for controlling the lifting of the centralizer 2 ensures that the outer diameter can reach 206mm, 209mm, and 212mm after the centralizer 2 extends; the signal for controlling the descent ensures that the three outer diameters of the centralizer 2 can be retracted from 206mm, 209mm, and 212mm to the required outer diameter height.

[0071] Furthermore, the brushless motor 6 rotates the drive core shaft 7 according to the instruction and controls its speed. The drive core shaft 7 drives the drive nut 8 to rotate through the connecting key, and the electronic control cavity 5 also rotates, thereby prompting the upper dovetail sleeve 401 and the lower dovetail sleeve 402 to move axially along the thread. The corresponding upper and lower sub-dovetail blocks 301 move in the dovetail groove and drive the centralizer 2 to achieve radial movement. When the centralizer 2 needs to be radially lifted, the upper dovetail sleeve 401 and the lower dovetail sleeve 402 move along the thread towards the centralizer 2; when the centralizer 2 needs to descend, the upper dovetail sleeve 401 and the lower dovetail sleeve 402 move along the thread away from the centralizer 2.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A closed-loop electronically controlled variable-diameter stabilizer, characterized in that, include: Reducer assembly and drive assembly; The reducer assembly comprises a reducer body (1), a straightening block (2), a dovetail block (3) and a dovetail sleeve (4); The diameter-changing body (1) is cylindrical and is provided with a plurality of hollow holes penetrating its side wall, and the plurality of hollow holes are evenly spaced around the axis of the diameter-changing body (1); The straightening blocks (2) correspond to the hollow holes one by one, are arranged in the hollow holes, and can move in a direction perpendicular to the axis of the variable diameter body (1); The dovetail blocks (3) correspond to the straightening blocks (2) one by one, are fixedly connected to the straightening blocks (2), and are located between the straightening blocks (2); The dovetail sleeve (4) is located in the diameter-changing body (1) and is slidably matched with the diameter-changing body (1). The dovetail sleeve (4) is also plug-fitted with the dovetail blocks (3), located between the dovetail blocks (3), and forms an inclined wedge mechanism with the dovetail blocks (3). The driving assembly is arranged in the diameter-changing body (1) and is drivingly connected to the dovetail sleeve (4) so ​​as to drive the dovetail sleeve (4) to slide axially along the diameter-changing body (1).

2. The closed-loop electronically controlled variable-diameter stabilizer according to claim 1, wherein The dovetail block (3) is divided into two sub-dovetail blocks (301), and along the axial direction of the variable diameter body (1), the two sub-dovetail blocks (301) are spaced apart from each other; The dovetail sleeve (4) is divided into an upper dovetail sleeve (401) and a lower dovetail sleeve (402). Along the axial direction of the reducer body (1), the upper dovetail sleeve (401) and the lower dovetail sleeve (402) are spaced apart, and one of the upper dovetail sleeve (401) is plugged into and matched with one of the sub-dovetail blocks (301), and the other is plugged into and matched with the other sub-dovetail block (301).

3. The closed-loop electronically controlled variable-diameter stabilizer according to claim 2, characterized in that, The drive assembly includes an electric control mechanism; The electric control mechanism comprises an electric control cavity (5), a brushless motor (6), a transmission spindle (7) and a transmission nut (8); The electric control cavity (5) is threadedly connected to the upper dovetail sleeve (401); The brushless motor (6) is arranged in the electric control cavity (5), and its output shaft is fixedly connected to the transmission core shaft (7); The transmission core shaft (7) is inserted through the upper dovetail sleeve (401) and the lower dovetail sleeve (402); The transmission nut (8) is sleeved on the transmission core shaft (7) and is fixedly connected to the transmission core shaft (7) so as to rotate along with the transmission core shaft (7); The lower dovetail sleeve (402) is sleeved on the transmission nut (8) and is threadedly connected to the transmission nut (8).

4. The closed-loop electronically controlled variable-diameter stabilizer according to claim 3, wherein, The electric control mechanism also includes a clamp (9) and a pressure cap (10); The transmission nut (8) is key-connected to the transmission spindle (7); The clamp (9) is embedded in the side surface of the transmission core shaft (7) and contacts the end surface of the transmission nut (8); The pressing cap (10) is threadedly connected to the end of the transmission core shaft (7), and its inner wall is in contact with the outer wall of the clamp (9).

5. The closed-loop electronically controlled variable-diameter stabilizer according to claim 3, wherein, A bearing (11) is arranged in the upper dovetail sleeve (401), and the transmission core shaft (7) passes through the bearing (11) and is transitionally matched with the bearing (11).

6. The closed-loop electronically controlled variable-diameter stabilizer according to claim 3, wherein The electric control mechanism further includes a high-temperature battery (12), which is arranged in the electric control cavity (5) and electrically connected to the brushless motor (6).

7. The closed-loop electronically controlled variable-diameter stabilizer according to claim 3, wherein The drive assembly further includes a sensing mechanism; The sensing mechanism includes a sensor (13), which is communicatively connected to the brushless motor (6) and is used for receiving the pulse signal transmitted by the mud pump.

8. The closed-loop electronically controlled variable-diameter stabilizer according to claim 7, wherein, The sensing mechanism further includes a base (14) and a sensing cavity (15); The sensing cavity (15) is cylindrical, one end of which is fixedly connected to the base (14), and the other end is fixedly connected to the electric control cavity (5); The sensor (13) is arranged in the space formed by enclosing the base (14) and the sensing cavity (15).

9. The closed-loop electronically controlled variable-diameter stabilizer according to any one of claims 1 to 8, characterized in that, Axially along the variable-diameter body (1), the variable-diameter body (1) is divided into an upper joint (101), a variable-diameter section (102) and a lower joint (103); Both ends of the variable-diameter section (102) are respectively threadedly connected to the upper joint (101) and the lower joint (103); Axially along the variable-diameter section (102), a bypass flow channel is arranged on the side wall of the variable-diameter section (102), and the bypass flow channel is communicated with the lower joint (103).

10. The closed-loop electronically controlled variable-diameter stabilizer according to claim 9, characterized in that, A piston (16) is inserted into the end of the variable-diameter section (102) close to the lower joint (103). A snap ring (17) is sleeved outside the piston (16), and the snap ring (17) is embedded in the inner wall of the variable-diameter section (102) to limit the piston (16) from sliding out of the variable-diameter section (102) axially in the variable-diameter section (102).

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