A centralizer for oil drilling

Abstract

The utility model discloses a kind of centralisers for oil drilling, it is related to oil drilling equipment technical field, including centraliser body and rolling auxiliary device, rolling auxiliary device is set on centraliser body, and rolling auxiliary device includes: mounting assembly, mounting assembly is set on centraliser body;Several elastic adjusting assemblies, several elastic adjusting assemblies are respectively set on mounting assembly;Several rolling components, several rolling components are respectively set on several elastic adjusting assemblies;Wherein, rolling component includes mounting arm and several rolling balls, mounting arm side is detachably connected with elastic adjusting assembly, and several rolling balls are set on the other side of mounting arm, and are rotatably connected with mounting arm, solve the current centraliser for oil drilling when using, centraliser outer wall and well wall long-time sliding friction, prone to cause centraliser outer wall serious abrasion, shorten service life, even affect the problem that drilling work carries out normally.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling equipment technology, specifically to a centralizer for oil drilling. Background Technology

[0002] In oil drilling operations, centralizers are key tools to ensure the smooth progress of the drilling process. Their function is to stabilize the downhole drilling tools, ensure that the wellbore trajectory meets design requirements, and prevent well deviation changes. During operation, centralizers need to be in contact with the wellbore for extended periods and move relative to it, enduring complex forces and friction.

[0003] Currently, most centralizers on the market achieve their centralizing function through direct contact between their outer wall and the wellbore. As drilling continues, this constant sliding friction between the centralizer's outer wall and the wellbore causes significant wear on the centralizer's outer wall over extended periods. When this wear reaches a certain level, the centralizer's centralizing effect is greatly reduced, or it may even malfunction, severely impacting the continuity and stability of drilling operations. Furthermore, frequent centralizer replacements increase the time and economic costs of drilling operations, and if a drilling accident occurs due to centralizer malfunction, it can cause substantial losses to the entire drilling project.

[0004] In conclusion, developing a new type of oil drilling centralizer that can effectively reduce sliding friction between the outer wall of the centralizer and the well wall, reduce wear on the outer wall of the centralizer, improve its service life, and ensure the smooth progress of drilling operations is of great practical significance. Utility Model Content

[0005] Based on this, and in response to the above problems, this utility model proposes a centralizer for oil drilling, which solves the problem that when current centralizers are used, the outer wall of the centralizer slides and rubs against the well wall for a long time, which easily leads to severe wear of the outer wall of the centralizer, shortens its service life, and even affects the normal operation of drilling.

[0006] The technical solution of this utility model is:

[0007] A centralizer for oil drilling includes a centralizer body and a rolling auxiliary device. The rolling auxiliary device is disposed on the centralizer body and includes:

[0008] The mounting component is mounted on the body of the centralizer and is detachably connected to the body of the centralizer;

[0009] Several flexible adjustment components are respectively disposed on the mounting component and are detachably connected to the mounting component;

[0010] Several rolling components are respectively disposed on several elastic adjustment components and are detachably connected to the elastic adjustment components;

[0011] The rolling assembly includes a mounting arm and several rolling balls. One side of the mounting arm is detachably connected to the elastic adjustment assembly, and the rolling balls are located on the other side of the mounting arm and are rotatably connected to the mounting arm. The rolling balls can contact and roll with the well wall.

[0012] Preferably, the mounting arm includes a main arm and a tilting arm. One end of the main arm is fixedly connected to the tilting arm, and one side of the main arm is detachably connected to the elastic adjustment component. The other side of the main arm is provided with a mounting groove and an L-shaped buckle plate. One end of the L-shaped buckle plate is inserted into the main arm, and the other end is detachably connected to the main arm by bolts to close the mounting groove. The L-shaped buckle plate is provided with mating ports that cooperate with a number of rolling balls. The rolling balls are disposed in the mounting groove and extend out of the mating ports respectively. The rolling balls are rotatably connected to the mounting groove and the mating ports.

[0013] Preferably, one end of the L-shaped buckle is fixedly provided with a plug-in part, and the main arm is provided with a plug-in groove that cooperates with the plug-in part, and the plug-in part is plugged into the plug-in groove.

[0014] Preferably, a leveling block is fixedly provided at the lower end of the main boom, and the leveling block can slide in contact with the well wall.

[0015] Preferably, the mounting assembly includes a pair of mounting semicircular rings, which are mounted on the centralizer body and detachably connected to it. Each of the two mounting semicircular rings has a semicircular gasket on one side that contacts the centralizer body. The semicircular gasket is fixedly connected to the mounting semicircular ring, with one side of the semicircular gasket contacting the mounting semicircular ring and the other side contacting the centralizer body.

[0016] Preferably, connecting blocks are fixed on both sides of the mounting semicircular ring, and the connecting blocks on a pair of mounting semicircular rings are detachably connected by bolts.

[0017] Preferably, the elastic adjustment assembly includes several elastic adjustment structures, one end of which is detachably connected to the mounting semicircular ring, and the other end of which is detachably connected to the main body.

[0018] Preferably, the elastic adjustment structure includes a mounting block, a mounting sleeve, a sliding rod, a spring, a locking cap, and a fixing plate. One end of the mounting sleeve is fixedly connected to the mounting block. The spring is disposed inside the mounting sleeve. One end of the sliding rod is disposed inside the mounting sleeve and is slidably connected to the mounting sleeve. A limiting part is provided at the end of the sliding rod located inside the mounting sleeve. The limiting part is slidably connected to the mounting sleeve and has one side in contact with the spring. The locking cap is disposed at the other end of the mounting sleeve and is threadedly connected to the mounting sleeve. The other end of the sliding rod passes through the locking cap and is slidably connected to the locking cap. The fixing plate is fixedly disposed at the end of the sliding rod that passes through the locking cap. An mounting strip that cooperates with the mounting block is fixedly provided on the outside of the mounting semicircular ring. The mounting block is engaged with the mounting strip and is detachably connected to the mounting strip by bolts. The fixing plate is detachably connected to the main arm by bolts.

[0019] Preferably, the upper end of the stabilizer body has a first connecting part, the lower end has a second connecting part, and the top of the first connecting part is provided with several snap-fit ​​grooves.

[0020] Preferably, a pair of limiting rings are fixedly provided on the body of the straightener, one of the limiting rings is located at the lower end of the first connecting part, and the other limiting ring is located at the upper end of the second connecting part. A limiting space is formed between the pair of limiting rings, and a pair of mounting semicircular rings are installed in the limiting space. The pair of limiting rings are used to limit the up and down movement of the pair of mounting semicircular rings.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention replaces sliding friction with rolling friction by incorporating a detachable rolling auxiliary device on the centralizer body. The mounting assembly is a detachable basic installation structure, while the elastic adjustment assembly adapts to changes in wellbore diameter and external disturbances, dynamically adjusting the position of the rolling assembly to ensure effective contact between the rolling assembly and the wellbore wall. The rolling balls within the rolling assembly contact the wellbore wall and roll with the drill string, significantly reducing friction loss. Furthermore, the detachable design facilitates localized maintenance and replacement, not only significantly extending the centralizer's service life and reducing replacement frequency to save costs, but also ensuring the wellbore trajectory meets design requirements through stable centralization, improving the continuity and stability of drilling operations. This invention solves the problem of prolonged sliding friction between the centralizer's outer wall and the wellbore wall during current oil drilling centralizer use, which easily leads to severe wear of the centralizer's outer wall, shortens its service life, and even affects normal drilling operations. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a centralizer for oil drilling as described in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the rolling auxiliary device described in the embodiments of this utility model;

[0026] Figure 3 This is a schematic diagram of the installation component described in the embodiments of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the straightening device body described in the embodiment of this utility model;

[0028] Figure 5 This is a partially exploded structural diagram of the elastic adjustment component and the rolling component described in the embodiments of this utility model;

[0029] Figure 6 This is as described in the embodiments of this utility model. Figure 5 A magnified schematic diagram of the local structure at point A;

[0030] Figure 7 This is an exploded structural diagram of the elastic adjustment structure described in the embodiments of this utility model;

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Straightener body, 11-Rolling auxiliary device, 12-Mounting assembly, 13-Elastic adjustment assembly, 14-Rolling assembly, 15-Mounting arm, 16-Rolling ball, 17-Main arm, 18-Tilt arm, 19-Mounting groove, 20-L-shaped buckle plate, 21-Matching port, 22-Plug-in part, 23-Plug-in groove, 24-Leveling block, 25-Mounting semi-circular ring, 26-Semi-circular gasket, 27-Connecting block, 28-Elastic adjustment structure, 29-Mounting locking block, 30-Mounting sleeve, 31-Sliding rod, 32-Spring, 33-Locking cap, 34-Fixing plate, 35-Restricting part, 36-Mounting strip, 37-First connecting part, 38-Second connecting part, 39-Locking groove, 40-Restricting ring, 41-Restricting space. Detailed Implementation

[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0039] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0040] Example:

[0041] like Figures 1 to 7 As shown, this embodiment discloses a centralizer for oil drilling, including a centralizer body 10 and a rolling auxiliary device 11. The rolling auxiliary device 11 is disposed on the centralizer body 10 and includes:

[0042] Mounting component 12 is mounted on the centralizer body 10 and is detachably connected to the centralizer body 10.

[0043] A plurality of elastic adjustment components 13 are respectively disposed on the mounting component 12 and are detachably connected to the mounting component 12;

[0044] A plurality of rolling components 14 are respectively disposed on a plurality of elastic adjustment components 13 and are detachably connected to the elastic adjustment components 13.

[0045] The rolling assembly 14 includes a mounting arm 15 and a plurality of rolling balls 16. One side of the mounting arm 15 is detachably connected to the elastic adjustment assembly 13, and the plurality of rolling balls 16 are disposed on the other side of the mounting arm 15 and are rotatably connected to the mounting arm 15. The plurality of rolling balls 16 can contact and roll with the well wall.

[0046] This invention replaces sliding friction with rolling friction by incorporating a detachable rolling auxiliary device 11 on the stabilizer body 10. The mounting component 12 is a detachable basic mounting structure, and the elastic adjustment component 13 adapts to changes in wellbore diameter and external disturbances, dynamically adjusting the position of the rolling component 14 to ensure effective contact between the rolling component 14 and the well wall. The rolling ball 16 within the rolling component 14 contacts the well wall and rolls with the drill string, significantly reducing friction loss. Simultaneously, the detachable design facilitates localized maintenance and replacement, not only significantly extending the stabilizer's service life and reducing replacement frequency to save costs, but also ensuring the wellbore trajectory meets design requirements through a stable centralizing effect, improving the continuity and stability of drilling operations. This solves the problem of prolonged sliding friction between the stabilizer's outer wall and the well wall during current oil drilling stabilizer use, which easily leads to severe wear of the stabilizer's outer wall, shortens its service life, and even affects the normal operation of drilling.

[0047] To facilitate the installation of the rolling balls 16, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the mounting arm 15 includes a main arm 17 and an inclined arm 18. One end of the main arm 17 is fixedly connected to the inclined arm 18, and one side of the main arm 17 is detachably connected to the elastic adjustment component 13. The other side of the main arm 17 is provided with a mounting groove 19 and an L-shaped buckle plate 20. One end of the L-shaped buckle plate 20 is inserted into the main arm 17, and the other end is detachably connected to the main arm 17 by bolts to close the mounting groove 19. The L-shaped buckle plate 20 is provided with mating ports 21 that cooperate with a plurality of rolling balls 16. The plurality of rolling balls 16 are disposed in the mounting groove 19 and extend out of the mating ports 21 respectively. The plurality of rolling balls 16 are rotatably connected to the mounting groove 19 and the mating ports 21.

[0048] The mating opening 21 and mounting groove 19 on the L-shaped buckle 20 facilitate the installation of the rolling ball 16. During installation, simply insert the rolling ball 16 into the mounting groove 19, then install the L-shaped buckle 20, and ensure that several rolling balls 16 are mated with the mating opening 21 to complete the installation of the rolling ball 16.

[0049] After installation, the rolling ball 16 can rotate within the mounting groove 19 and the mating opening 21. The mating opening 21 is used to limit the position of the rolling ball 16, prevent the rolling ball 16 from falling off and moving up and down, and ensure that the rolling ball 16 can rotate in the preset position, so that the rolling ball 16 can roll along the well wall after contacting the well wall.

[0050] Among them, one end of the L-shaped buckle plate 20 is fixedly provided with a plug-in part 22, and the main arm 17 is provided with a plug-in groove 23 that cooperates with the plug-in part 22, and the plug-in part 22 is plugged into the plug-in groove 23.

[0051] The insertion part 22 and the insertion slot 23 facilitate the installation of the L-shaped buckle plate 20.

[0052] As a further preferred embodiment, a leveling block 24 is fixedly provided at the lower end of the main arm 17, and the leveling block 24 can slide in contact with the well wall. The setting of the leveling block 24 allows it to contact the well wall earlier than the rolling ball 16, thereby playing a role in leveling the well wall and facilitating the rolling ball 16 to roll along the well wall. The outermost edge of the leveling block 24 needs to be flush with the outermost edge of the rolling ball 16, so as to ensure that both the rolling ball 16 and the leveling block 24 can effectively contact the well wall.

[0053] To facilitate the assembly and disassembly of the mounting component 12, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the mounting component 12 includes a pair of mounting semicircular rings 25. The pair of mounting semicircular rings 25 are mounted on the centralizer body 10 and are detachably connected to the centralizer body 10. A semicircular gasket 26 is provided on the side of the pair of mounting semicircular rings 25 that contacts the centralizer body 10. The semicircular gasket 26 is fixedly connected to the mounting semicircular ring 25. One side of the semicircular gasket 26 contacts the mounting semicircular ring 25, and the other side contacts the centralizer body 10.

[0054] Connecting blocks 27 are fixed on both sides of the mounting semicircular ring 25, and the connecting blocks 27 on a pair of mounting semicircular rings 25 are detachably connected by bolts.

[0055] The mounting assembly 12 is configured as a pair of mounting semicircular rings 25, with connecting blocks 27 on both sides of each semicircular ring 25. The connecting blocks 27 on the pair of mounting semicircular rings 25 are detachably connected by bolts, facilitating the assembly and disassembly of the mounting assembly 12. During installation, the pair of mounting semicircular rings 25 are installed on the centralizer body, and then the connecting blocks 27 on the pair of mounting semicircular rings 25 are connected by bolts to achieve the installation and fixation of the mounting assembly 12. The semicircular gaskets 26 can be made of flexible rubber or silicone material, as is available in the prior art. The semicircular gaskets 26 help protect the centralizer body 10 from scratches and also facilitate a more stable connection between the pair of mounting semicircular rings 25 and the centralizer body 10.

[0056] To facilitate the dynamic adjustment of the rolling assembly 14, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the elastic adjustment assembly 13 includes several elastic adjustment structures 28. One end of each elastic adjustment structure 28 is detachably connected to the mounting semi-circular ring 25, and the other end is detachably connected to the main arm 17.

[0057] The elastic adjustment structure 28 includes a mounting block 29, a mounting sleeve 30, a sliding rod 31, a spring 32, a locking cap 33, and a fixing plate 34. One end of the mounting sleeve 30 is fixedly connected to the mounting block 29. The spring 32 is disposed inside the mounting sleeve 30. One end of the sliding rod 31 is disposed inside the mounting sleeve 30 and is slidably connected to the mounting sleeve 30. A limiting part 35 is provided at the end of the sliding rod 31 located inside the mounting sleeve 30. The limiting part 35 is slidably connected to the mounting sleeve 30 and one side contacts the spring 32. The locking cap 33 is located at the other end of the mounting sleeve 30 and is threadedly connected to the mounting sleeve 30. The other end of the sliding rod 31 passes through the locking cap 33 and is slidably connected to the locking cap 33. The fixing plate 34 is fixedly located at the end of the sliding rod 31 that passes through the locking cap 33. The outer side of the mounting semicircular ring 25 is fixedly provided with a mounting strip 36 that cooperates with the mounting block 29. The mounting block 29 is engaged with the mounting strip 36 and is detachably connected to the mounting strip 36 by bolts. The fixing plate 34 is detachably connected to the main arm 17 by bolts.

[0058] In use, the sliding rod 31 and spring 32 facilitate the dynamic adjustment of the rolling assembly 14. The mounting block 29, mounting strip 36, and fixing plate 34 allow for easy replacement of the elastic adjustment structure 28. The overall structure is detachably connected by bolts, further facilitating assembly and disassembly. In use, the deformation of the spring 32 causes the sliding rod 31 to extend or retract, thereby achieving dynamic adjustment of the rolling assembly 14.

[0059] To facilitate the installation of the centralizer body 10, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that the centralizer body 10 has a first connecting part 37 at the upper end and a second connecting part 38 at the lower end. The top of the first connecting part 37 is provided with several snap-fit ​​grooves 39.

[0060] The first connecting part 37 and the second connecting part 38 facilitate the installation of the centralizer body 10 in the middle of the drilling string, and the several snap-fit ​​grooves 39 facilitate direct tightening with special tools, making installation convenient.

[0061] To facilitate the restriction of the vertical movement of the rolling assist device 11, this embodiment is an improvement on the above embodiment. The difference from the above embodiment is that a pair of restriction rings 40 are fixedly provided on the body 10 of the straightener. One restriction ring 40 is located at the lower end of the first connecting part 37, and the other restriction ring 40 is located at the upper end of the second connecting part 38. A restriction space 41 is formed between the pair of restriction rings 40. A pair of mounting semicircular rings 25 are installed in the restriction space 41. The pair of restriction rings 40 are used to restrict the vertical movement of the pair of mounting semicircular rings 25.

[0062] The setting of a pair of limiting rings 40 can effectively limit the up and down movement of a pair of mounting semicircular rings 25, thereby facilitating the restriction of the up and down movement of the rolling auxiliary device 11 and improving the stability of the installation of the rolling auxiliary device 11.

[0063] Working principle of this utility model:

[0064] This invention replaces sliding friction with rolling friction by setting a detachable rolling auxiliary device 11 on the centralizer body 10. The mounting component 12 is a detachable basic mounting structure, and the elastic adjustment component 13 can adapt to changes in wellbore diameter and external force disturbances, thereby dynamically adjusting the position of the rolling component 14 to ensure that the rolling component 14 can effectively fit against the well wall. The rolling ball 16 in the rolling component 14 contacts the well wall and rolls with the movement of the drill string, thereby significantly reducing friction loss. At the same time, the detachable design facilitates local maintenance and replacement, which not only significantly extends the service life of the centralizer and reduces the replacement frequency to save costs, but also ensures that the wellbore trajectory meets the design requirements through a stable centralization effect, improving the continuity and stability of drilling operations.

[0065] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centralizer for oil drilling, characterized in that, It includes a centralizer body (10) and a rolling auxiliary device (11), the rolling auxiliary device (11) being disposed on the centralizer body (10), and the rolling auxiliary device (11) including: Mounting component (12) is mounted on the body of the stabilizer (10) and is detachably connected to the body of the stabilizer (10); A plurality of elastic adjustment components (13) are respectively disposed on the mounting component (12) and are detachably connected to the mounting component (12); A plurality of rolling components (14) are respectively disposed on a plurality of elastic adjustment components (13) and are detachably connected to the elastic adjustment components (13); The rolling assembly (14) includes a mounting arm (15) and several rolling balls (16). One side of the mounting arm (15) is detachably connected to the elastic adjustment assembly (13), and several rolling balls (16) are disposed on the other side of the mounting arm (15) and are rotatably connected to the mounting arm (15). The several rolling balls (16) can contact the well wall and roll.

2. A centralizer for oil drilling according to claim 1, characterized in that, The mounting arm (15) includes a main arm (17) and an inclined arm (18). One end of the main arm (17) is fixedly connected to the inclined arm (18). One side of the main arm (17) is detachably connected to the elastic adjustment component (13). The other side of the main arm (17) is provided with a mounting groove (19) and an L-shaped buckle plate (20). One end of the L-shaped buckle plate (20) is inserted into the main arm (17), and the other end is detachably connected to the main arm (17) by bolts. It is used to close the mounting groove (19). The L-shaped buckle plate (20) is provided with a mating port (21) that is configured to cooperate with a number of rolling balls (16). The number of rolling balls (16) are set in the mounting groove (19) and extend out of the mating port (21). The number of rolling balls (16) are rotatably connected to the mounting groove (19) and the mating port (21).

3. A centralizer for oil drilling according to claim 2, characterized in that, One end of the L-shaped buckle (20) is fixedly provided with a plug-in part (22), and the main arm (17) is provided with a plug-in groove (23) that cooperates with the plug-in part (22). The plug-in part (22) is plugged into the plug-in groove (23).

4. A centralizer for oil drilling according to claim 3, characterized in that, A leveling block (24) is fixedly provided at the lower end of the main boom (17), and the leveling block (24) can slide in contact with the well wall.

5. A centralizer for oil drilling according to claim 4, characterized in that, The mounting assembly (12) includes a pair of mounting semicircular rings (25), which are mounted on the centralizer body (10) and are detachably connected to the centralizer body (10). The side of the pair of mounting semicircular rings (25) that contacts the centralizer body (10) is provided with a semicircular gasket (26). The semicircular gasket (26) is fixedly connected to the mounting semicircular ring (25). One side of the semicircular gasket (26) contacts the mounting semicircular ring (25), and the other side contacts the centralizer body (10).

6. A centralizer for oil drilling according to claim 5, characterized in that, Connecting blocks (27) are fixed on both sides of the mounting semicircular ring (25), and the connecting blocks (27) on a pair of mounting semicircular rings (25) are detachably connected by bolts.

7. A centralizer for oil drilling according to claim 6, characterized in that, The elastic adjustment assembly (13) includes several elastic adjustment structures (28), one end of which is detachably connected to the mounting semicircular ring (25), and the other end is detachably connected to the main arm (17).

8. A centralizer for oil drilling according to claim 7, characterized in that, The elastic adjustment structure (28) includes a mounting block (29), a mounting sleeve (30), a sliding rod (31), a spring (32), a locking cap (33), and a fixing plate (34). One end of the mounting sleeve (30) is fixedly connected to the mounting block (29). The spring (32) is located inside the mounting sleeve (30). One end of the sliding rod (31) is located inside the mounting sleeve (30) and is slidably connected to the mounting sleeve (30). The end of the sliding rod (31) located inside the mounting sleeve (30) is provided with a limiting part (35). The limiting part (35) is slidably connected to the mounting sleeve (30), and one side is connected to the spring (32). The locking cap (33) is located at the other end of the mounting sleeve (30) and is threadedly connected to the mounting sleeve (30). The other end of the sliding rod (31) passes through the locking cap (33) and is slidably connected to the locking cap (33). The fixing plate (34) is fixedly located at the end of the sliding rod (31) that passes through the locking cap (33). The outer side of the mounting semicircular ring (25) is fixedly provided with a mounting strip (36) that cooperates with the mounting block (29). The mounting block (29) is snapped onto the mounting strip (36) and is detachably connected to the mounting strip (36) by bolts. The fixing plate (34) is detachably connected to the main arm (17) by bolts.

9. A centralizer for oil drilling according to claim 8, characterized in that, The upper end of the body (10) of the straightener has a first connecting part (37) and the lower end has a second connecting part (38). The top of the first connecting part (37) is provided with several snap-fit ​​grooves (39).

10. A centralizer for oil drilling according to claim 9, characterized in that, A pair of limiting rings (40) are fixedly provided on the body (10) of the straightener. One limiting ring (40) is located at the lower end of the first connecting part (37), and the other limiting ring (40) is located at the upper end of the second connecting part (38). A limiting space (41) is formed between the pair of limiting rings (40). A pair of mounting semicircular rings (25) are installed in the limiting space (41). The pair of limiting rings (40) are used to limit the up and down movement of the pair of mounting semicircular rings (25).

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