Hydraulic centralizer

Abstract

The utility model relates to the technical field of centralizers, and discloses a hydraulic centralizer which comprises a connecting pipe body, a plurality of positioning grooves are formed around the outer wall of the connecting pipe body at intervals, hydraulic cylinders are arranged in groove bodies at the front ends of the positioning grooves, pistons and piston rods are arranged in the hydraulic cylinders, and the outer ends of the piston rods extend out of the rear ends of the hydraulic cylinders. A limiting elastic piece is arranged at the outer end of the piston rod, a limiting locking device is arranged on the limiting elastic piece close to the connecting position of the limiting elastic piece and the piston rod, and a limiting sinking groove is formed in the rear side of the hydraulic cylinder. The device can adapt to oil wells of different sizes and can stably support oil pipes, the hydraulic cylinders, the limiting elastic pieces and the limiting locking devices are arranged in the positioning grooves, damage caused by collision between the devices and the well wall can be effectively prevented, the limiting locking devices are matched with the limiting sinking grooves, and the oil pipes can be stably supported through the limiting locking devices. The bent limiting elastic piece can be effectively positioned, and the phenomenon that the limiting elastic piece rebounds when hydraulic pressure in an oil pipe is unstable is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of centralizers, in particular to a hydraulic centralizer. Background Art

[0002] In the process of oil and gas extraction, cementing technology plays a vital role. It is a key technology to ensure the stability of the well and the smooth extraction of oil and gas. As an important auxiliary tool in the cementing process, the centralizer is widely used to assist the positioning of the casing in the wellbore and maintain the vertical direction. However, traditional centralizers have encountered significant challenges when applied to horizontal wells. Its large outer diameter makes it difficult to deploy in narrow horizontal well sections, limiting its application in complex well conditions.

[0003] To solve this problem, hydraulic centralizers were developed. They effectively help the pipe maintain its center position in the wellbore through the adjustable support force provided by the hydraulic system, thus ensuring the quality of construction. However, existing hydraulic centralizers are not without defects. Their support force is completely dependent on the pressure of the hydraulic system. Once the system has pressure fluctuations or leaks, the support force will be weakened or even eliminated, causing the centralizer to become unstable and rebound. This situation will not only delay the construction progress, but also may cause serious safety hazards, increasing the uncertainty and risk in the construction process.

[0004] Therefore, there is an urgent need for a new type of hydraulic centralizer, which can not only adapt to the narrow horizontal well section but also has stable supporting performance. Utility Model Content

[0005] The purpose of the utility model is to provide a hydraulic centralizer which can adapt to oil wells of different sizes and can stably support the oil pipe in view of the above problems.

[0006] To achieve the above-mentioned purpose, the utility model discloses a hydraulic straightener, including a connecting pipe body, whose structural feature is that a plurality of positioning grooves arranged along the length direction of the connecting pipe body are arranged at intervals on the outer wall of the connecting pipe body, a hydraulic cylinder connected to the connecting pipe body is arranged in the groove body at the front end of the positioning groove, a piston and a piston rod arranged along the axial direction of the connecting pipe body are arranged in the hydraulic cylinder, and the outer end of the piston rod extends out of the rear end of the hydraulic cylinder, and a limiting spring piece connected to the rear side wall of the positioning groove is arranged on the outer end of the piston rod, a limiting locking device is arranged on the limiting spring piece near the connection between the limiting spring piece and the piston rod, and a limiting groove matching the limiting locking device is arranged on the bottom wall of the positioning groove located on the rear side of the hydraulic cylinder.

[0007] After adopting the above structure, by arranging a plurality of positioning grooves on the connecting pipe body, and arranging a hydraulic cylinder, a limiting spring piece and a limiting locking device in the positioning grooves, it can effectively prevent the connecting pipe body from being damaged due to collision with the well wall when the connecting pipe body follows the oil pipe to extend into the wellbore. By cooperating with the limiting spring piece through the piston and the piston rod and the limiting spring piece, it can be convenient to adapt to oil wells of different calibers and provide stable support for the oil pipe. By cooperating with the limiting locking device and the limiting sink, the bent limiting spring piece can be effectively positioned to prevent the limiting spring piece from rebounding due to hydraulic instability in the oil pipe.

[0008] Preferably, the positioning groove is a strip-shaped groove body and is located near the front end of the pipe body, and multiple positioning grooves are arranged opposite to each other along the central axis of the pipe body. By arranging multiple positioning grooves opposite to each other, it can effectively ensure that the limiting springs in the positioning grooves are in full contact with the well wall, so as to ensure the stability of the oil pipe when it is centered.

[0009] Preferably, the hydraulic cylinder includes a cylindrical shell fixedly connected to the front end of the positioning groove, and a connecting port connected to the inner cavity of the connecting pipe body is provided on the inner wall of the front end of the cylindrical shell. The piston is arranged in the hydraulic cylinder and a plurality of sealing rings matching the hydraulic cylinder are provided on the piston.

[0010] Preferably, a piston rod is provided at the rear end of the piston and the piston rod extends out of the hydraulic cylinder along the direction of piston movement. A limiting spring is fixedly connected to the outer end of the piston rod. The width of the limiting spring is adapted to the width of the slot of the positioning slot. The limiting spring comprises two connecting plate bodies arranged in the horizontal direction and on the same horizontal plane. An outer convex plate body protruding toward the outer end of the slot of the positioning slot is connected between the two connecting plate bodies. One end of the limiting spring is fixedly connected to the outer end of the piston rod, and the other end of the limiting spring is fixedly connected to the rear side wall of the positioning slot. By fixing the rear end of the limiting spring to the rear side wall of the positioning slot, the front end is fixedly connected to the piston rod and moves backward with the piston rod, and the middle part is an outer convex structure, the bending of the limiting spring is more convenient.

[0011] Preferably, the position-limiting locking device comprises a fixed housing screwed on the front end of the position-limiting spring piece in the vertical direction, the fixed housing is a cylindrical housing structure and a through hole communicating with the interior is arranged on the bottom surface of the fixed housing, a guide column arranged in the vertical direction is fixedly connected to the inner wall of the fixed housing at one end away from the positioning groove, the length of the guide column is adapted to the depth of the chamber of the fixed housing, the outer end of the guide column is sleeved with a locking column which moves up and down along the guide column and extends out of the through hole and cooperates with the position-limiting sink groove, and the guide column is sleeved with a first return spring which is clamped on the inner end of the locking column and the inner end of the guide column. The first return spring cooperates with the locking column and the guide column, so that the locking column can extend out of the fixed housing and reciprocate along the length direction of the guide column.

[0012] Preferably, the locking column includes a clamping part located in the fixed housing and clamped at the through hole, and also includes a positioning part arranged on the outer end surface of the clamping part and extending into the limiting groove through the through hole. A limiting cavity arranged along the length direction of the locking column and adapted to the guide column is provided at the middle position of the inner end surface of the locking column. The longitudinal section of the front edge of one end of the locking column extending into the limiting groove is in the shape of a right angle, and the longitudinal section of the rear edge of one end of the locking column extending into the limiting groove is in the shape of an arc. By respectively setting the two side edges of the front and rear ends of the locking column end to be a right angle and an arc, the locking of the limiting spring piece can be facilitated, and the rebound phenomenon of the limiting spring piece can be effectively prevented.

[0013] Preferably, the limiting groove is arranged along the length direction of the positioning groove and the front end of the limiting groove is in contact with the front side wall of the positioning groove. The length of the limiting groove is adapted to the distance that the piston slides forward and backward in the hydraulic cylinder. The width of the limiting groove is adapted to the width of the body of the limiting locking device extending into the limiting groove. The bottom of the limiting groove is provided with a plurality of positioning blocks that cooperate with the limiting locking device at intervals along the length direction of the limiting groove. Through the interval arrangement of the plurality of positioning blocks, the limiting spring piece can be matched with the limiting locking device to control the limiting spring piece at different curvatures to ensure stable support for the oil pipe.

[0014] Preferably, the height of the positioning block is smaller than the depth of the limiting groove, the longitudinal section of the front edge of the positioning block is arc-shaped, and the longitudinal section of the rear edge of the positioning block is right-angled.

[0015] Preferably, an adjustable partition covering the slot of the limiting slot and sliding forward and backward along the slot is provided at the slot of the limiting slot. The setting of the adjustable partition can prevent debris in the well wall from entering the limiting slot, effectively ensuring that the limiting locking device locks the limiting spring piece.

[0016] Preferably, the adjustable partition includes a sliding baffle arranged in the horizontal direction and having a size adapted to the notch of the limiting sink groove, a receiving cavity adapted to the size of the sliding baffle is arranged on the rear side wall of the notch of the limiting sink groove and along the length direction of the pipe body, the receiving cavity is provided with a guide rod arranged along the length direction of the receiving cavity, the sliding baffle is provided with a guide hole arranged along the length direction of the plate body and matched with the guide rod, and the guide rod is sleeved with a second return spring clamped on the bottom of the receiving cavity and the rear end face of the sliding baffle. By clamping the second return spring on the bottom of the receiving cavity and the rear end face of the sliding baffle, the front end of the sliding baffle can always follow the limiting locking device to move to the rear end, effectively preventing debris in the wellbore from falling into the limiting sink groove at the rear end of the locking column.

[0017] To sum up, the beneficial effects of the utility model are: the utility model can adapt to oil wells of different sizes and can stably support the oil pipe. By arranging a plurality of positioning grooves on the connecting pipe body, and arranging a hydraulic cylinder, a limiting spring piece and a limiting locking device in the positioning groove, it can effectively prevent the connecting pipe body from being damaged due to collision with the well wall when the connecting pipe body extends into the wellbore following the oil pipe. By cooperating with the limiting spring piece through the piston and the piston rod and the limiting spring piece, it can be conveniently adapted to oil wells of different calibers and stably support the oil pipe. By cooperating with the limiting locking device and the limiting sink, the bent limiting spring piece can be effectively positioned to prevent the limiting spring piece from rebounding due to hydraulic instability in the oil pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the utility model when the limiting spring piece and the limiting locking device cooperate with each other in a locked state;

[0020] Figure 3 This is a schematic diagram of the structure of the limit locking device of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the adjustable partition of the utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the limit locking device of the utility model cooperating with the adjustable partition.

[0023] In the figure: 1. pipe body; 2. positioning groove; 3. hydraulic cylinder; 4. piston; 5. piston rod; 6. limiting spring; 7. limiting locking device; 8. limiting sink groove; 9. cylindrical shell; 10. connecting port; 11. sealing ring; 12. connecting part plate; 13. outer protruding part plate; 14. fixed shell; 15. through hole; 16. guide column; 17. locking column; 18. first return spring; 19. clamping part; 20. positioning part; 21. limiting cavity; 22. positioning block; 23. adjustable partition; 24. sliding baffle; 25. accommodating cavity; 26. guide rod; 27. guide hole; 28. second return spring. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0028] like Figure 1 and Figure 2 As shown, the utility model comprises a pipe body 1, and a plurality of positioning grooves 2 arranged along the length direction of the pipe body 1 are arranged at intervals on the outer wall of the pipe body 1. A hydraulic cylinder 3 connected to the pipe body 1 is arranged in the groove body at the front end of the positioning groove 2. When designing, a piston 4 and a piston rod 5 arranged along the axial direction of the pipe body 1 are arranged in the hydraulic cylinder 3, and the outer end of the piston rod 5 extends out of the rear end of the hydraulic cylinder 3. When manufacturing, the positioning groove 2 is a strip-shaped groove body and is close to the front end of the pipe body 1, wherein the plurality of positioning grooves 2 are arranged along the pipe body 1. The central axes are arranged opposite to each other in pairs, and the hydraulic cylinder 3 includes a cylindrical shell 9 fixedly connected to the front end of the positioning groove 2, and a connecting port 10 connected to the inner cavity of the connecting pipe body 1 is arranged on the inner wall of the front end of the cylindrical shell 9, and the piston 4 is movably connected in the hydraulic cylinder 3. At the same time, a plurality of sealing rings 11 cooperating with the hydraulic cylinder 3 are arranged on the piston 4. In this way, when pressure is injected into the connecting pipe body 1, hydraulic pressure can enter the hydraulic cylinder 3 through the connecting port 10, thereby pushing the piston 4 and the piston rod 5 in the hydraulic cylinder 3 to move backward and making the outer end of the piston rod 5 extend backward all the time.

[0029] like Figure 1 and Figure 2 as well as Figure 3As shown, in a preferred embodiment of the utility model, a limiting spring piece 6 connected to the rear side wall of the positioning groove 2 is fixedly connected to the outer end of the piston rod 5, the width of the limiting spring piece 6 is adapted to the width of the slot of the positioning groove 2, and at the same time, the installation direction of the limiting spring piece 6 is consistent with the movement direction of the piston rod 5. When designed, the limiting spring piece 6 includes two connecting plate bodies 12 arranged along the horizontal direction and located on the same horizontal plane, and the middle of the two connecting plate bodies 12 is connected with an outer convex plate body 13 protruding toward the outer end of the slot of the positioning groove 2. One end of the limiting spring piece 6 is fixedly connected to the outer end of the piston rod 5, and the other end of the limiting spring piece 6 is fixedly connected to the rear side wall of the positioning groove 2. In this way, by fixing the rear end of the limiting spring piece 6 to the rear side wall of the positioning groove 2, the front end is fixedly connected to the piston rod 5 and moves backward with the piston rod 5, and the middle body is a convex structure, so that the limiting spring piece 6 body is more convenient to bend.

[0030] like Figure 2 and Figure 3 As shown, in another preferred embodiment of the utility model, a limited locking device 7 is provided on the limited spring piece 6 near the connection between the limited spring piece 6 and the piston rod 5, and the limited locking device 7 includes a fixed shell 14 screwed to the front end of the limited spring piece 6 in the vertical direction, the fixed shell 14 is a cylindrical shell 9 structure and a through hole 15 communicating with the interior is provided on the bottom surface of the fixed shell 14, a thread is provided on the outer wall of the lower part of the fixed shell 14, and the inner wall of the fixed shell 14 at the end away from the positioning groove 2 is provided. A guide column 16 arranged in the vertical direction is fixedly connected to the upper part, and the length of the guide column 16 is adapted to the depth of the chamber of the fixed housing 14. The inner end of the guide column 16 is fixed to the inner end of the fixed housing 14. At the same time, a locking column 17 is sleeved on the outer end of the guide column 16, which moves up and down along the guide column 16 and extends out of the through hole 15 and cooperates with the limiting sink groove 8. The guide column 16 is also sleeved with a first return spring 18 clamped on the inner end of the locking column 17 and the inner end of the guide column 16. In this way, the first return spring 18 cooperates with the locking column 17 and the guide column 16, so that the locking column 17 can extend out of the fixed housing 14 and reciprocate along the length direction of the guide column 16. During design, the locking column 17 includes a clamping portion 19 located in the fixed housing 14 and clamped at the through hole 15, and also includes a positioning portion 20 arranged on the outer end surface of the clamping portion 19 and extending into the limiting recessed groove 8 through the through hole 15. A limiting cavity 21 arranged along the length direction of the locking column 17 and adapted to the guide column 16 is provided at the middle position of the inner end surface of the locking column 17. During manufacturing, the longitudinal section of the front edge of one end of the locking column 17 extending into the limiting recessed groove 8 is a right angle, and the longitudinal section of the rear edge of one end of the locking column 17 extending into the limiting recessed groove 8 is an arc. By setting the two side edges at the front and rear ends of the locking column 17 to be a right angle and an arc respectively, the locking of the limiting spring sheet 6 can be facilitated, and the rebound phenomenon of the limiting spring sheet 6 can be effectively prevented.

[0031] like Figure 2 and Figure 3 as well as Figure 4 As shown, in a specific embodiment of the utility model, a limiting groove 8 cooperating with the limiting locking device 7 is arranged on the bottom wall of the positioning groove 2 located at the rear side of the hydraulic cylinder 3, and the limiting groove 8 is arranged along the length direction of the positioning groove 2 and the front end of the limiting groove 8 is in contact with the front side wall of the positioning groove 2. The length of the limiting groove 8 is adapted to the distance that the piston 4 slides back and forth in the hydraulic cylinder 3, and the width of the limiting groove 8 is adapted to the width of the end of the locking column 17 extending into the limiting groove 8 by the limiting locking device 7. When designing, a plurality of positioning blocks 22 cooperating with the end of the locking column 17 are arranged at intervals at the bottom of the limiting groove 8 along the length direction of the limiting groove 8, wherein The height of the positioning block 22 is less than the depth of the limiting groove 8 and is adapted to the end of the locking column 17 extending into the limiting groove 8. The shape of the longitudinal section of the front edge of each positioning block 22 is an arc, and the shape of the longitudinal section of the rear edge of the positioning block 22 is a right angle, so that the front and rear edges of the end of the locking column 17 are respectively arranged to be right angles and arcs, so that when the limiting locking device 7 moves backward with the front end of the limiting spring piece 6, the end of the locking column 17 extending into the limiting groove 8 is more convenient to move to the rear end and cannot move to the front end. In this way, the limiting spring piece 6 can be controlled at different curvatures to prevent the rebound of the limiting spring piece 6 and ensure stable support for the oil pipe.

[0032] like Figure 1 and Figure 2 as well as Figure 4 and Figure 5 As shown, in another specific embodiment of the utility model, an adjustable partition 23 covering the notch of the limiting groove 8 and sliding back and forth along the notch is provided at the notch of the limiting groove 8, and the adjustable partition 23 includes a sliding baffle 24 arranged in the horizontal direction and adapted in size to the notch of the limiting groove 8, and an accommodating cavity 25 adapted in size to the sliding baffle 24 is provided on the rear side wall of the notch of the limiting groove 8 and along the length direction of the pipe body 1, and a guide rod 26 arranged along the length direction of the accommodating cavity 25 is fixedly connected in the accommodating cavity 25, and a guide hole 27 arranged along the length direction of the plate body and matched with the guide rod 26 is provided on the sliding baffle 24, and at the same time, a second return spring 28 clamped on the bottom of the accommodating cavity 25 and on the rear end face of the sliding baffle 24 is also sleeved on the guide rod 26. By clamping the second return spring 28 on the bottom of the accommodating chamber 25 and the rear end surface of the sliding baffle 24, the front end of the sliding baffle 24 can always follow the limit locking device 7 to move toward the rear end, effectively preventing debris in the wellbore from falling into the limit groove 8 at the rear end of the locking column 17. Of course, during the manufacturing process, the above-mentioned adjustable partition 23 can also be set as a detachable structure, by setting a clamping groove on the bottom wall of the positioning groove 2 on the rear side of the limit groove 8, and setting the accommodating chamber 25 into a rectangular shell structure and clamping it at the clamping groove.

[0033] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. 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 utility model.

Claims

1. A hydraulic centralizer, comprising a pipe body (1), characterized in that: The outer wall of the annular pipe body (1) is provided with a plurality of positioning grooves (2) arranged along the length direction of the pipe body (1), a hydraulic cylinder (3) connected to the pipe body (1) is arranged in the groove body at the front end of the positioning groove (2), a piston (4) and a piston rod (5) arranged along the axial direction of the pipe body (1) are arranged in the hydraulic cylinder (3), and the outer end of the piston rod (5) extends out of the rear end of the hydraulic cylinder (3), and the outer end of the piston rod (5) is provided with a limiting spring piece (6) connected to the rear side wall of the positioning groove (2), and a limiting locking device (7) is provided on the limiting spring piece (6) near the connection between the limiting spring piece (6) and the piston rod (5), and a limiting sink groove (8) matched with the limiting locking device (7) is provided on the bottom wall of the positioning groove (2) located on the rear side of the hydraulic cylinder (3).

2. The hydraulic centralizer according to claim 1, characterized in that: The positioning groove (2) is a strip-shaped groove body and is located close to the front end of the connecting pipe body (1). A plurality of positioning grooves (2) are arranged opposite to each other in pairs along the central axis of the connecting pipe body (1).

3. The hydraulic centralizer according to claim 1, characterized in that: The hydraulic cylinder (3) comprises a cylindrical housing (9) fixedly connected to the front end of the positioning groove (2); a communication port (10) communicating with the inner cavity of the pipe body (1) is provided on the inner wall of the front end of the cylindrical housing (9); the piston (4) is arranged in the hydraulic cylinder (3) and a plurality of sealing rings (11) matching with the hydraulic cylinder (3) are provided on the piston (4).

4. The hydraulic centralizer according to claim 3, characterized in that: A piston rod (5) is provided at the rear end of the piston (4), and the piston rod (5) extends outward from the hydraulic cylinder (3) along the movement direction of the piston (4). A limiting spring piece (6) is fixedly connected to the outer end of the piston rod (5). The width of the limiting spring piece (6) is adapted to the width of the slot of the positioning groove (2). The limiting spring piece (6) comprises two connecting plate bodies (12) arranged in a horizontal direction and located on the same horizontal plane. An outer convex plate body (13) protruding toward the outer end of the slot of the positioning groove (2) is connected between the two connecting plate bodies (12). One end of the limiting spring piece (6) is fixedly connected to the outer end of the piston rod (5), and the other end of the limiting spring piece (6) is fixedly connected to the rear side wall of the positioning groove (2).

5. The hydraulic centralizer according to claim 1, characterized in that: The limit locking device (7) comprises a fixed shell (14) screwed to the front end of the limit spring sheet (6) in the vertical direction, the fixed shell (14) is a cylindrical shell (9) structure and a through hole (15) communicating with the interior is arranged on the bottom surface of the fixed shell (14), a guide column (16) arranged in the vertical direction is fixedly connected to the inner wall of the fixed shell (14) at one end away from the positioning groove (2), the length of the guide column (16) is adapted to the depth of the chamber of the fixed shell (14), the outer end of the guide column (16) is sleeved with a locking column (17) which moves up and down along the guide column (16) and extends out of the through hole (15), and the guide column (16) is sleeved with a first return spring (18) which is clamped on the inner end of the locking column (17) and the inner end of the guide column (16).

6. The hydraulic centralizer according to claim 5, characterized in that: The locking column (17) comprises a clamping portion (19) located in the fixed housing (14) and clamped at the through hole (15), and also comprises a positioning portion (20) arranged on the outer end surface of the clamping portion (19) and extending into the limiting recessed groove (8) through the through hole (15). A limiting cavity (21) arranged along the length direction of the locking column (17) and adapted to the guide column (16) is provided at the middle position of the inner end surface of the locking column (17). The longitudinal section of the front edge of one end of the locking column (17) extending into the limiting recessed groove (8) is in the shape of a right angle, and the longitudinal section of the rear edge of one end of the locking column (17) extending into the limiting recessed groove (8) is in the shape of an arc.

7. The hydraulic centralizer according to claim 1, characterized in that: The limiting groove (8) is arranged along the length direction of the positioning groove (2) and the front end of the limiting groove (8) is in contact with the front side wall of the positioning groove (2). The length of the limiting groove (8) is adapted to the distance that the piston (4) slides forward and backward in the hydraulic cylinder (3). The width of the limiting groove (8) is adapted to the width of the body of the limiting locking device (7) extending into the limiting groove (8). A plurality of positioning blocks (22) cooperating with the limiting locking device (7) are arranged at intervals at the bottom of the limiting groove (8) along the length direction of the limiting groove (8).

8. The hydraulic centralizer according to claim 7, characterized in that: The height of the positioning block (22) is smaller than the depth of the limiting sink (8), the longitudinal section of the front edge of the positioning block (22) is in the shape of an arc, and the longitudinal section of the rear edge of the positioning block (22) is in the shape of a right angle.

9. The hydraulic centralizer according to claim 1, characterized in that: An adjustable partition (23) is provided at the notch of the position-limiting sink groove (8), covering the notch of the position-limiting sink groove (8) and sliding forward and backward along the notch.

10. The hydraulic centralizer according to claim 9, characterized in that: The adjustable partition (23) comprises a sliding baffle (24) arranged in a horizontal direction and having a size adapted to the slot opening of the limiting sink groove (8); a receiving cavity (25) adapted to the size of the sliding baffle (24) is arranged on the rear side wall of the slot opening of the limiting sink groove (8) and along the length direction of the pipe body (1); a guide rod (26) arranged along the length direction of the receiving cavity (25) is arranged in the receiving cavity (25); a guide hole (27) arranged along the length direction of the plate body and cooperating with the guide rod (26) is arranged on the sliding baffle (24); a second return spring (28) is sleeved on the guide rod (26) and is clamped on the bottom of the receiving cavity (25) and the rear end surface of the sliding baffle (24).

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