Hydraulic casing centralizer and method of use

Abstract

The present application belongs to the technical field of drilling, and particularly relates to a hydraulic casing centralizer and a use method thereof. The hydraulic casing centralizer comprises an upper joint and a lower joint. A sliding assembly is slidably connected in the upper joint. An operating plate is connected to one end of the sliding assembly facing the lower joint. A centralizing arm is hingedly connected to one end of the lower joint facing the upper joint. The wedge shape on the operating plate matches the wedge shape on the centralizing arm. A hydraulic separation device and a flow channel are arranged on the sliding assembly. Liquid flows into the space between the sliding assembly and the upper joint through the flow channel. The hydraulic separation device drives the operating plate to move towards the centralizing arm according to the pressure setting value. A limiting assembly is arranged between the sliding assembly and the upper joint to limit the position of the operating plate after movement. The operating plate drives the centralizing arm to rotate and support the well wall by using the wedge shape matching the centralizing arm. The centralizer forces the casing string to be centered in the wellbore, thereby improving the cementing quality.

Description

Technical Field

[0001] This invention belongs to the field of drilling technology, and specifically relates to a hydraulic casing centralizer and its usage method. Background Technology

[0002] Currently, more and more wells are being developed for oil and gas using horizontal well technology, both domestically and internationally. Centralizers of various forms and specifications are among the most commonly used tools in cementing operations. Their main function is to ensure that the casing is centered in the wellbore and improve cementing quality.

[0003] In oil drilling, wellbore enlargement is a common occurrence. Existing casing centralizers have several shortcomings when dealing with such complex wellbore conditions. Traditional centralizers often fail to adapt well to changes in wellbore diameter, resulting in the casing not being accurately centered in the wellbore. This not only affects the quality of subsequent cementing but may also lead to a series of problems such as casing wear and reservoir damage, seriously impacting the efficiency and safety of oil extraction operations. Summary of the Invention

[0004] To address the above problems, this invention proposes a hydraulic sleeve straightener, comprising an upper connector and a lower connector. A sliding component is slidably connected inside the upper connector, and an operating plate is connected to the end of the sliding component facing the lower connector. A straightener arm is hinged to the end of the lower connector facing the upper connector.

[0005] The wedge shape on the control panel matches the wedge shape on the straightening arm;

[0006] The sliding assembly is equipped with a hydraulic separation device and a flow channel. Liquid flows into the space between the sliding assembly and the upper connector through the flow channel. The hydraulic separation device drives the operating plate to move toward the straightening arm according to the pressure setting value. A limit component is provided between the sliding assembly and the upper connector to limit the position of the operating plate after movement.

[0007] Furthermore, the sliding assembly includes a sliding sleeve and an impact sleeve; the sliding sleeve and the impact sleeve are slidably and sealingly connected to the inner wall of the upper connector; a hydraulic separation device is installed between the sliding sleeve and the impact sleeve; the hydraulic separation device disconnects when the pressure set value is reached; the flow channel is opened on the sliding sleeve; the end of the impact sleeve away from the hydraulic separator is connected to the operating plate; a sealing ring is installed between the sliding sleeve and the upper connector.

[0008] Furthermore, the hydraulic separation device includes a tension separator, which is mounted on the sliding assembly; a first annular cavity is formed between the sliding assembly and the inner wall of the upper connector, and a first elastic assembly is disposed within the first annular cavity.

[0009] Furthermore, the limiting component includes a fixed plate and a hinge plate. The fixed plate is mounted on the impact sleeve. One end of the hinge plate is hinged to one end of the fixed plate. A second elastic component is installed between the other end of the hinge plate and the other end of the fixed plate. A fixing block is provided on the hinge plate. A fixing groove matching the fixing block is provided on the upper connector.

[0010] Furthermore, the tension separator includes a pressure pulse valve, which initiates separation after a preset pressure value is reached inside the centralizer.

[0011] Furthermore, the sliding sleeve includes a horizontal sleeve and a vertical sleeve that are perpendicular to each other. One end of the horizontal sleeve is slidably connected to the inner wall of the upper connector, and the other end of the horizontal sleeve is connected to the tension separator; the vertical sleeve is slidably connected to the inner wall of the upper connector.

[0012] Furthermore, a second annular cavity is formed between the sliding sleeve and the upper connector; a first annular cavity is formed between the sliding sleeve, the impact sleeve, and the upper connector.

[0013] Furthermore, the straightening arm is connected to the lower connector via a pin.

[0014] Furthermore, the fixing block includes a longitudinal block and a transverse block, and the fixing groove includes a longitudinal groove and a transverse groove; the transverse groove matches the transverse block, and the sum of the widths of the longitudinal groove and the transverse groove is greater than the sum of the widths of the longitudinal block and the transverse block and the width of the transverse block.

[0015] This invention proposes a method for using a hydraulic casing centralizer, characterized by employing a hydraulic casing centralizer as described in any one of claims; specifically including the following steps:

[0016] After connecting the upper and lower connectors to the casing string, they are lowered into the wellbore.

[0017] After the fixing is completed, the drilling fluid enters the No. 1 annular cavity through the flow channel, which drives the sliding component to move in the direction of casing string removal, and the No. 1 elastic component is in a contracted state.

[0018] When the pressure reaches the set value of the tension separator, the tension separator disconnects, causing the sliding components to separate. The first elastic component pushes the part of the sliding component connected to the operation plate to move in the direction of the centralizer's downward movement.

[0019] The control panel pushes the centering arm to rotate around the pivot pin, and the centering arm supports the well wall.

[0020] Beneficial effects

[0021] The advantages of this invention over the prior art are as follows:

[0022] 1. This application allows the centralizing arm to be in an inaccessible state before cementing, facilitating the insertion of the centralizing tool. After cementing, the pressure inside the casing string increases, and this pressure is transmitted to the centralizing tool through the casing string. When the pressure of the hydraulic separation device reaches a preset value, the hydraulic separation device is disconnected, causing the sliding components to separate. This allows the sliding components connected to the operating plate to move the operating plate toward the centralizing arm. The operating plate, using a wedge shape that matches the centralizing arm, drives the centralizing arm to rotate and support the well wall. The centralizing tool forces the casing string to be centered within the wellbore, improving cementing quality.

[0023] 2. In this application, after the pressure inside the centralizer increases, the tension separator disconnects, causing the impact force of the energy-storing first elastic component to drive the impact sleeve toward the centralizing arm. While the impact sleeve drives the operating plate to push the centralizing arm against the well wall, the impact sleeve drives the limiting component to move and fix it to the inner wall of the upper connector, ensuring the centralizing effect of the centralizing arm.

[0024] 3. This application, by setting up horizontal and vertical blocks, allows the impact sleeve to move to the right, driving the fixed plate and hinge plate to move to the right. When the fixed block moves to the corresponding position in the fixed groove, the second elastic component begins to gradually extend. The second elastic component drives the hinge plate to rotate around the fixed plate, thereby driving the fixed block into the fixed groove. The horizontal and vertical blocks of the fixed block simultaneously enter the vertical groove. When the impact sleeve has a tendency to retreat to the left, the horizontal block enters the horizontal groove, further limiting the impact sleeve and further ensuring the position limitation effect of the straightening arm.

[0025] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A cross-sectional view of the straightening arm without opening is shown in an embodiment of the present invention.

[0028] Figure 2 An overall cross-sectional view of the straightening arm in an embodiment of the present invention is shown.

[0029] Figure 3A partial cross-sectional view of the straightening arm in an embodiment of the present invention is shown with the arm not open.

[0030] Figure 4 A partial cross-sectional view of the straightening arm in an embodiment of the present invention is shown.

[0031] Figure 5 A cross-sectional view of the limiting component in an embodiment of the present invention is shown.

[0032] Figure 6 It shows Figure 2 A magnified view of a portion of point A in the middle.

[0033] In the diagram, 1. Upper connector; 2. Sealing ring; 3. Lower connector; 4. Operating panel; 5. Straightening arm; 6. Flow channel; 7. Annular cavity No. 1; 8. Annular cavity No. 2; 9. Pin.

[0034] 20. Sliding component; 201. Sliding sleeve; 2011. Horizontal sleeve; 2012. Vertical sleeve; 202. Impact sleeve;

[0035] 30. Limiting component; 301. Fixing plate; 302. Hinge plate; 303. Second elastic component; 304. Fixing block; 3041. Longitudinal block; 3042. Transverse block; 305. Fixing groove;

[0036] 3051, longitudinal groove; 3052, transverse groove;

[0037] 40. Hydraulic separation device; 401. Tension separator; 402. Elastic component No. 1. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This application provides a hydraulic sleeve centralizer, referenced... Figure 1 and Figure 2 It includes an upper connector 1 and a lower connector 3. The upper connector 1 is slidably connected to a sliding component 20. The end of the sliding component 20 facing the lower connector 3 is connected to an operating plate 4. The end of the lower connector 3 facing the upper connector 1 is hinged to a straightening arm 5.

[0040] The wedge shape on the operation panel 4 matches the wedge shape on the straightening arm 5;

[0041] The sliding assembly 20 is provided with a hydraulic separation device 40 and a flow channel 6. Liquid flows into the space between the sliding assembly 20 and the upper connector 1 through the flow channel 6. The hydraulic separation device 40 drives the operating plate 4 to move toward the straightening arm 5 according to the pressure setting value. A limit component 30 is provided between the sliding assembly 20 and the upper connector 1. The limit component 30 limits the position of the operating plate 4 after it has moved.

[0042] During implementation, the female thread of the upper connector 1 and the male thread of the lower connector 3 are connected to the casing string, and then lowered into the wellbore. After the casing string is lowered to the designated position, cementing operations are performed. After cementing is completed, the pressure gradually builds up, and the pressure inside the casing string increases. The pressure is transmitted to the centralizer tool through the casing string. The drilling fluid flows into the sliding assembly 20 and the upper connector 1 through the flow channel 6 in the direction of centralizer removal. The drilling fluid drives the sliding assembly 20 and the hydraulic separation device 40 to move in the direction of centralizer removal. Figure 1 (Left side of the middle); After the pressure of the hydraulic separation device 40 reaches the set value, the hydraulic separation device 40 drives the operating plate 4 to move in the direction of the straightener's downward movement (left side of the middle); Figure 1 (on the right side of the middle), the operating plate 4 pushes the straightening arm 5 to rotate around the lower connector 3. After the straightening arm 5 rotates, the support faces the well wall, and the straightener forces the casing string to be centered in the wellbore, improving the cementing quality. During the process of the sliding component 20 moving to the right, it drives the limiting component 30 to move to the right. After the limiting component 30 moves to the designated position, the limiting component 30 is fixed to the position of the upper connector 1, thereby fixing the position of the sliding component 20 and the operating plate 4, ensuring the straightening angle and straightening effect of the straightening arm 5.

[0043] This application allows the centralizing arm 5 to be in an open state before cementing, facilitating the insertion of the centralizing tool. After cementing, the pressure increases after the pressure is released, causing the hydraulic separation device 40 to open, thereby moving the operating plate 4 toward the centralizing arm 5, which in turn rotates to support the well wall. The centralizing tool forces the casing string to be centered in the wellbore, improving the cementing quality.

[0044] In one embodiment of the present invention, reference is made to Figure 3 and Figure 4 The sliding assembly 20 includes a sliding sleeve 201 and an impact sleeve 202; the sliding sleeve 201 and the impact sleeve 202 are slidably and sealingly connected to the inner wall of the upper connector 1, and the hydraulic separation device 40 is installed between the sliding sleeve 201 and the impact sleeve 202; the flow channel 6 is opened on the sliding sleeve 201; the end of the impact sleeve 202 away from the hydraulic separator is connected to the operating plate 4.

[0045] During implementation, drilling fluid flows into the space between the sliding sleeve 201 and the upper connector 1 through the flow channel 6. The pressure drives the sliding sleeve 201, the hydraulic separation device 40, and the impact sleeve 202 to move in the direction of removing the centralizer. Figure 1(Left side of the image) After the hydraulic separation device 40 reaches the preset pressure value, the hydraulic separation device 40 causes the impact sleeve 202 and the sliding sleeve 201 to separate, and the impact sleeve 202 drives the operating plate 4 to move in the direction of the centralizer's downward movement. Figure 1 (on the right side of the middle), the operating panel 4 pushes the centralizing arm 5 to rotate around the lower connector 3. After the centralizing arm 5 rotates, the support faces the well wall. The centralizer forces the casing string to be centered in the wellbore, improving the cementing quality. During the process of the impact sleeve 202 moving to the right, the impact sleeve 202 drives the limiting component 30 to move to the right. After the limiting component 30 moves to the designated position, the limiting component 30 matches and fixes with the upper connector 1 to limit the position of the impact sleeve 202.

[0046] In one embodiment of the present invention, reference is made to Figure 3 and Figure 4 The hydraulic separation device 40 includes a tension separator 401, which is mounted on the sliding assembly 20; a first annular cavity 7 is formed between the sliding assembly 20 and the inner wall of the upper connector 1, and a first elastic assembly 402 is disposed in the first annular cavity 7.

[0047] During the process, drilling fluid enters the first annular cavity 7 through the flow channel 6, thereby driving the sliding sleeve 201, the impact sleeve 202, and the first elastic component 402 to move in the direction of centralizer removal. Figure 1 (Left side of the middle), during the leftward movement of the first elastic component 402, it is in a contracted state. When the pressure reaches the preset value set by the tension separator 401, the tension separator 401 disconnects. The impact force provided by the energy-storing first elastic component 402 pushes the impact sleeve 202 to move toward the direction of the centralizer's entry, thereby the impact sleeve 202 drives the operating plate 4 to move to the right. The operating plate 4 pushes the centralizing arm 5 to rotate around the lower connector 3. The centralizing arm 5 supports the well wall, so that the centralizer forces the casing to be centered in the wellbore.

[0048] In one embodiment of the present invention, reference is made to Figure 5 The limiting component 30 includes a fixing plate 301 and a hinge plate 302. The fixing plate 301 is mounted on the impact sleeve 202. One end of the hinge plate 302 is hinged to one end of the fixing plate 301. A second elastic component 303 is installed between the other end of the hinge plate 302 and the other end of the fixing plate 301. A fixing block 304 is provided on the hinge plate 302. A fixing groove 305 matching the fixing block 304 is provided on the upper connector 1.

[0049] During implementation, as the impact sleeve 202 moves the operating plate 4 to the right, the second elastic component 303 is in a compressed state. When the fixed block 304 moves to the fixed groove 305, the second elastic component 303 gradually extends, and the hinge plate 302 rotates around the fixed plate 301, causing the fixed block 304 to gradually enter the fixed groove 305, thus fixing and limiting the position of the operating plate 4. This prevents the impact sleeve 202 from moving in the opposite direction and causing the operating plate 4 to detach from the straightening arm 5, which would prevent the straightening arm 5 from working continuously.

[0050] In one embodiment of the present invention, the tension separator 401 includes a pressure pulse valve, and the tension separator 401 starts to separate after a preset pressure value is reached inside the stabilizer.

[0051] During the process, after the drilling fluid enters the first annular cavity 7 through the flow channel 6, the internal pressure gradually increases. After the pressure pulse valve reaches a certain pressure, the tension separator 401 will open to form a passage, and the drilling fluid will flow into it. The soluble material inside will decompose, causing the tension separator 401 to separate, thereby causing the impact sleeve 202 and the sliding sleeve 201 to separate.

[0052] In one embodiment of the present invention, reference is made to Figure 3 The sliding sleeve 201 includes a horizontal sleeve 2011 and a vertical sleeve 2012 that are perpendicular to each other. One end of the horizontal sleeve 2011 is slidably connected to the inner wall of the upper connector 1, and the other end of the horizontal sleeve 2011 is connected to the tension separator 401. The vertical sleeve 2012 is slidably connected to the inner wall of the upper connector 1.

[0053] In one embodiment of the present invention, a second annular cavity 8 is formed between the sliding sleeve 201 and the upper connector 1; a first annular cavity 7 is formed between the sliding sleeve 201, the impact sleeve 202 and the upper connector 1.

[0054] In one embodiment of the present invention, the straightening arm 5 is connected to the lower connector 3 via a pin 9.

[0055] During implementation, the drilling fluid enters the first annular cavity 7 through the flow channel 6, thereby causing the sliding sleeve 201 and the impact sleeve 202 to move to the left. The area of ​​the first annular cavity 7 and the second annular cavity 8 decreases. The first elastic component 402 is compressed during the leftward movement of the impact sleeve 202. At the same time, the pressure of the pressure pulse valve gradually increases during this process. After reaching the preset value, the tension separator 401 separates, and the impact sleeve separates from the sliding sleeve 201. The potential energy accumulated in the first elastic component 402 causes the impact sleeve 202 and the operating plate 4 to move to the right. The operating plate 4 pushes the straightening arm 5 to rotate around the pin 9. During the rightward movement of the impact sleeve 202, the limiting component 30 is activated, which limits the position of the operating plate 4 and the straightening arm 5.

[0056] In one embodiment of the present invention, reference is made to Figure 6 The fixing block 304 includes a longitudinal block 3041 and a transverse block 3042, and the fixing groove 305 includes a longitudinal groove 3051 and a transverse groove 3052; the transverse groove 3052 matches the transverse block 3042, and the sum of the widths of the longitudinal groove 3051 and the transverse groove 3052 is greater than the sum of the widths of the longitudinal block 3041 and the transverse block 3042.

[0057] In one embodiment of the present invention, a sealing ring 2 is installed between the sliding sleeve 201 and the upper connector 1. The sealing ring 2 is an O-ring rubber sealing ring 2. By setting the sealing ring 2 between the sliding sleeve 201 and the upper connector 1, the sealing effect between the sliding sleeve 201 and the upper connector 1 is improved, ensuring the working effect of the centralizer tool.

[0058] During implementation, as the impact sleeve 202 moves to the right, it drives the fixing plate 301 and the hinge plate 302 to move to the right. When the fixing block 304 moves to the corresponding position of the fixing groove 305, the second elastic component 303 begins to gradually extend. The second elastic component 303 drives the hinge plate 302 to rotate around the fixing plate 301, thereby driving the fixing block 304 into the fixing groove 305. The transverse block 3042 and the longitudinal block 3041 of the fixing block 304 simultaneously enter the longitudinal groove 3051. After the longitudinal block 3041 is completely inside the longitudinal groove 3051, the position of the transverse block 3042 corresponds to the position of the transverse groove 3052. When the impact sleeve 202 has a tendency to retreat to the left, the transverse block 3042 enters the transverse groove 3052, further limiting the impact sleeve 202 and further ensuring the position limitation effect of the straightening arm 5.

[0059] When the limit needs to be released during non-operation, the impact sleeve 202 is moved to the right, causing the transverse block 3042 to disengage from the transverse groove 3052. Then, the hinge plate 302 is pressed down, causing the fixing block 304 to disengage from the fixing groove 305.

[0060] This application provides a method for using a hydraulic casing centralizer, employing any of the hydraulic casing centralizers described above; specifically, it includes the following steps:

[0061] After connecting the upper connector 1 and the lower connector 3 to the casing string respectively, they are lowered into the wellbore.

[0062] After the fixing is completed, the drilling fluid enters the first annular cavity 7 through the flow channel 6, which drives the sliding component 20 to move in the direction of casing string removal, and the first elastic component 402 is in a contracted state.

[0063] When the pressure reaches the set value of the tension separator 401, the tension separator 401 disconnects, causing the sliding assembly 20 to separate, and the first elastic component 402 pushes the part of the sliding assembly 20 connected to the operation plate 4 to move in the direction of the straightener's downward movement.

[0064] The control panel 4 pushes the straightening arm 5 to rotate around the pin 9, and the straightening arm 5 supports the well wall.

[0065] Specific work process:

[0066] Connect the female thread of the upper connector 1 and the male thread of the lower connector 3 to the casing string, and then lower them into the wellbore. After the casing string is lowered to the designated position, cementing operations are performed. After cementing is completed, the pressure will gradually build up and solidify. The pressure is transmitted to the centralizer tool through the casing string, and the drilling fluid flows into the space between the sliding sleeve 201 and the upper connector 1 through the flow channel 6, thereby causing the sliding sleeve 201, the impact sleeve 202, and the first elastic component 402 to move to the left. Figure 1 (Left side) During the leftward movement of the first elastic component 402, it is in a contracted state. When the pressure reaches the preset value set by the tension separator 401, the tension separator 401 will open to form a passage, and the drilling fluid will flow into it. The soluble material inside will decompose, causing the tension separator 401 to disconnect. The impact force provided by the energy-storing first elastic component 402 pushes the impact sleeve 202 to move to the right, thereby driving the operating plate 4 to move to the right. The operating plate 4 pushes the centralizing arm 5 to rotate around the lower connector 3. The centralizing arm 5 supports the well wall, so that the centralizer forces the casing to be centered in the wellbore. During the rightward movement of the impact sleeve 202 and the operating plate 4, the second elastic component 303 is in a compressed state. When the fixed block 304 moves to the position of the fixed groove 305, the second elastic component 303 gradually extends, and the hinge plate 302 rotates around the fixed plate 301, so that the fixed block 304 gradually enters the fixed groove 305, fixing and limiting the position of the operating plate 4.

[0067] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic casing centralizer, characterized in that, It includes an upper connector (1) and a lower connector (3). The upper connector (1) is slidably connected to a sliding component (20). The sliding component (20) is connected to an operating plate (4) at one end facing the lower connector (3). The lower connector (3) is hinged to a straightening arm (5) at one end facing the upper connector (1). The wedge shape on the operating plate (4) matches the wedge shape on the straightening arm (5); The sliding assembly (20) is provided with a hydraulic separation device (40) and a flow channel (6). Liquid flows into the space between the sliding assembly (20) and the upper connector (1) through the flow channel (6). The hydraulic separation device (40) drives the operating plate (4) to move toward the straightening arm (5) according to the pressure setting value. A limit component (30) is provided between the sliding assembly (20) and the upper connector (1). The limit component (30) limits the position of the operating plate (4) after it has moved.

2. The hydraulic sleeve centralizer according to claim 1, characterized in that, The sliding assembly (20) includes a sliding sleeve (201) and an impact sleeve (202); the sliding sleeve (201) and the impact sleeve (202) are slidably and sealingly connected to the inner wall of the upper connector (1); the hydraulic separation device (40) is installed between the sliding sleeve (201) and the impact sleeve (202); the hydraulic separation device (40) disconnects when the pressure setting value is reached; the flow channel (6) is opened on the sliding sleeve (201); the end of the impact sleeve (202) away from the hydraulic separator is connected to the operating plate (4); a sealing ring (2) is installed between the sliding sleeve (201) and the upper connector (1).

3. A hydraulic sleeve centralizer according to claim 1, characterized in that, The hydraulic separation device (40) includes a tension separator (401), which is mounted on the sliding assembly (20); a first annular cavity (7) is formed between the sliding assembly (20) and the inner wall of the upper connector (1), and a first elastic assembly (402) is provided in the first annular cavity (7).

4. A hydraulic sleeve centralizer according to claim 1, characterized in that, The limiting component (30) includes a fixing plate (301) and a hinge plate (302). The fixing plate (301) is mounted on the impact sleeve (202). One end of the hinge plate (302) is hinged to one end of the fixing plate (301). A second elastic component (303) is installed between the other end of the hinge plate (302) and the other end of the fixing plate (301). A fixing block (304) is provided on the hinge plate (302). A fixing groove (305) matching the fixing block (304) is provided on the upper connector (1).

5. A hydraulic sleeve centralizer according to claim 3, characterized in that, The tension separator (401) includes a pressure pulse valve, and the tension separator (401) starts to separate after the preset pressure value is reached inside the centralizer.

6. A hydraulic sleeve centralizer according to claim 2, characterized in that, The sliding sleeve (201) includes a horizontal sleeve (2011) and a vertical sleeve (2012) that are perpendicular to each other. One end of the horizontal sleeve (2011) is slidably connected to the inner wall of the upper connector (1), and the other end of the horizontal sleeve (2011) is connected to the tension separator (401). The vertical sleeve (2012) is slidably connected to the inner wall of the upper connector (1).

7. A hydraulic sleeve centralizer according to claim 2, characterized in that, A second annular cavity (8) is formed between the sliding sleeve (201) and the upper connector (1); a first annular cavity (7) is formed between the sliding sleeve (201), the impact sleeve (202) and the upper connector (1).

8. A hydraulic sleeve centralizer according to claim 1, characterized in that, The straightening arm (5) is connected to the lower connector (3) via a pin (9).

9. A hydraulic sleeve centralizer according to claim 4, characterized in that, The fixing block (304) includes a longitudinal block (3041) and a transverse block (3042), and the fixing groove (305) includes a longitudinal groove (3051) and a transverse groove (3052); the transverse groove (3052) matches the transverse block (3042), and the sum of the widths of the longitudinal groove (3051) and the transverse groove (3052) is greater than the sum of the widths of the longitudinal block (3041) and the transverse block (3042) and the width of the transverse block (3042).

10. A method of using a hydraulic sleeve centralizer, characterized in that, The hydraulic casing centralizer described in any one of claims 1-9 specifically includes the following steps: After connecting the upper connector (1) and the lower connector (3) to the casing string respectively, they are lowered into the wellbore; After the fixing is completed, the drilling fluid enters the first annular cavity (7) through the flow channel (6), which drives the sliding component (20) to move in the direction of casing string removal, and the first elastic component (402) is in a contracted state. When the pressure reaches the set value of the tension separator (401), the tension separator (401) disconnects, causing the sliding assembly (20) to separate, and the first elastic component (402) pushes the part of the sliding assembly (20) connected to the operation plate (4) to move in the direction of the straightener's downward movement; The control panel (4) pushes the straightening arm (5) to rotate around the pin (9), and the straightening arm (5) supports the well wall.

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