CN216517867U

CN216517867U - Centering guide

Info

Publication number: CN216517867U
Application number: CN202123430866.0U
Authority: CN
Inventors: 吴世运; 所文强; 韩滔; 雷越; 肖雨; 孙富强
Original assignee: Jereh Energy Services Corp
Current assignee: Jereh Energy Services Corp
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-13
Anticipated expiration: 2031-12-29

Abstract

The utility model provides a centralizer, which comprises a shell and a plurality of rollers, wherein the shell comprises a first shell part and a second shell part, and the first shell part and the second shell part jointly enclose a cylindrical cavity for accommodating a coiled tubing; the first housing part has a first end and a second end along the circumference of the cylindrical cavity, and the second housing part has a first end and a second end; the first end of the first shell part is rotationally connected with the first end of the second shell part, and a rotation axis between the first end of the first shell part and the first end of the second shell part is parallel to the central axis of the cylindrical cavity; the second end of the first housing portion and the second end of the second housing portion are removably connected; each roller is rotatably arranged on the shell around a corresponding preset axis, at least part of each roller is positioned on the outer side of the shell, and the preset axis is perpendicular to the central axis of the cylindrical cavity. The centralizer of this application has solved among the prior art and has carried out the very inconvenient problem of operation of the mode of centering to coiled tubing.

Description

Centering guide

Technical Field

The utility model relates to the technical field of oil pipe centralizing, in particular to a centralizer.

Background

Nowadays, the difficulty of oil and gas exploitation is increased, the depth of an oil and gas well is also increased, and the well descending depth of a coiled tubing is also continuously increased along with the increase of the well depth. In an ultra-deep well, due to the characteristics of good flexibility and the like of the coiled tubing, the coiled tubing can generate a self-locking state after being lowered to a certain depth and cannot be lowered into a deeper well, so that a coiled tubing centralizing and resistance reducing device is needed, the coiled tubing is kept centered in the lowering process, and the friction force is reduced.

At present, an auxiliary tool is usually installed at the front end of a coiled tubing for the operation of an ultra-deep well coiled tubing, one is a hydraulic oscillator, and the working principle of the hydraulic oscillator is that through the periodic change of fluid pressure, a piston realizes axial reciprocating motion under the dual actions of pressure and a spring, and simultaneously, a tool string of the hydraulic oscillator is driven to carry out axial reciprocating motion, so that static friction of a tool at the bottom of a well is converted into dynamic friction, and the coiled tubing is assisted to descend. However, the coiled tubing and the tube wall are always in a friction state, the coiled tubing cannot be centered, and the coiled tubing is easy to self-lock in an ultra-deep well.

The other is a creeper which is usually used in a horizontal well section, and the working principle of the creeper is that the friction between the continuous oil pipe and the inner wall of a well bore is broken through pulse oscillation at the upper part, and then the hydraulic turbine at the lower part is driven by high-speed fluid to generate driving force so as to drive the continuous oil pipe to move forwards.

In the underground well which needs larger power and has a worse environment, a plurality of crawlers are easy to turn over due to poor structural stability, the adaptability to the inner diameter of the well wall is poor, and the electrically driven crawlers need to add cables into a continuous oil pipe, occupy limited drilling fluid supply channels and have a small application range.

The existing centralizer for the oil pipe casing can be sleeved on the oil pipe casing when each section of the oil pipe casing goes into a well because the oil pipe casing is divided into sections, and plays a role in centering and centralizing the oil pipe casing. However, a coiled tubing string, typically several kilometers in length, cannot be used to install such centralizers.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a centralizer, and aims to solve the problem that the centering and centralizing mode of a coiled tubing in the prior art is extremely inconvenient to operate.

In order to achieve the above object, the present invention provides a centralizer comprising: the coiled tubing assembly comprises a shell, a first connecting piece and a second connecting piece, wherein the shell comprises a first shell part and a second shell part which jointly enclose a cylindrical cavity for accommodating the coiled tubing; the first shell part is provided with a first end and a second end along the circumferential direction of the cylindrical cavity, and the second shell part is provided with a first end and a second end; the first end of the first shell part is rotatably connected with the first end of the second shell part, and a rotating axis between the first end of the first shell part and the first end of the second shell part is parallel to the central axis of the cylindrical cavity; the second end of the first housing portion and the second end of the second housing portion are removably connected; the roller wheels are rotatably arranged on the shell around corresponding preset axes, at least part of each roller wheel is positioned on the outer side of the shell, and the preset axes are perpendicular to the central axis of the cylindrical cavity.

Further, the centralizer still includes: the first end of the first shell part is provided with a first rotating hole, and the first rotating shaft penetrates through the first rotating hole; a second rotating hole is formed in the first end of the second shell part, and the second rotating shaft penetrates through the second rotating hole; the first rotating shaft and the second rotating shaft are connected with the connecting piece; the first housing part is rotatably arranged around the central axis of the first rotating shaft, and/or the second housing part is rotatably arranged around the central axis of the second rotating shaft.

Furthermore, a first mounting groove is formed in the first shell part, a second mounting groove communicated with the first mounting groove is formed in the second shell part, and the connecting piece is arranged in the first mounting groove and the second mounting groove; the first rotating shaft and the second rotating shaft are arranged on the connecting piece in a penetrating mode; and/or the end surface of the first end part of the first shell part is an arc-shaped surface; and/or the end surface of the first end part of the second shell part is an arc-shaped surface.

Furthermore, the first mounting grooves and the second mounting grooves are multiple, the multiple first mounting grooves are arranged at intervals along the extending direction of the cylindrical cavity, and the multiple first mounting grooves are communicated with the multiple second mounting grooves in a one-to-one correspondence manner; the connecting pieces are arranged in one-to-one correspondence with the first mounting grooves and are arranged in the corresponding first mounting grooves and the corresponding second mounting grooves; the first rotating shaft sequentially penetrates through the plurality of connecting pieces, and the second rotating shaft sequentially penetrates through the plurality of connecting pieces.

Further, the centralizer still includes the third pivot, and the first end of first casing portion is provided with the third and rotates the hole, and the first end of second casing portion is provided with the fourth and rotates the hole, and the hole center line in third rotation hole and the coincidence of the hole center line in fourth rotation hole, and the third pivot is worn to establish in third rotation hole and fourth rotation hole, and first casing portion and/or second casing portion are rotationally set up around the central axis of third pivot.

Further, the first end of the first casing part is convexly provided with a first protruding part along the circumferential direction of the cylindrical cavity, the first end of the second casing part is convexly provided with a second protruding part along the circumferential direction of the cylindrical cavity, the third rotating hole is formed in the first protruding part, and the fourth rotating hole is formed in the second protruding part.

Further, the centralizer still includes: the second end of the first shell part is provided with a first connecting hole, and the second end of the second shell part is provided with a second connecting hole; the fastener is arranged in the first connecting hole and the second connecting hole in a penetrating mode, so that the first shell portion and the second shell portion are fixed relatively.

Further, the centralizer still includes: the axial direction of the first fixing shaft is parallel to the extending direction of the cylindrical cavity, and the first fixing shaft penetrates through the second end of the first shell part; the axial direction of the second fixing shaft is parallel to the extending direction of the cylindrical cavity, and the second fixing shaft penetrates through the second end of the second shell part; the mounting, first fixed axle and second fixed axle all are connected with the mounting.

Further, the centralizer also comprises a fixture block assembly, and the fixture block assembly is arranged between the cavity wall of the cylindrical cavity and the coiled tubing in the cylindrical cavity and is used for being fixed relative to the coiled tubing; at least part of a contact surface between the fixture block assembly and the cavity wall of the cylindrical cavity is a preset inclined surface; the preset inclined plane is provided with a first end and a second end along the moving direction of the continuous oil pipe, and the preset inclined plane is gradually close to the central axis of the cylindrical cavity from the first end to the second end of the preset inclined plane; wherein, the motion direction of the coiled tubing is parallel to or the same as the axial direction of the cylindrical cavity.

Further, the fixture block assembly comprises a first fixture block, and at least part of a contact surface between the first fixture block and the cavity wall of the cylindrical cavity is a first preset inclined surface; the first preset inclined plane is provided with a first end and a second end along the moving direction of the coiled tubing, and the first preset inclined plane is gradually close to the central axis of the cylindrical cavity from the first end to the second end of the first preset inclined plane; the second fixture block, the second fixture block and the first fixture block are distributed at intervals along the axial direction of the cylindrical cavity; at least part of a contact surface between the second fixture block and the cavity wall of the cylindrical cavity is a second preset inclined surface; the second preset inclined plane is provided with a first end and a second end along the moving direction of the coiled tubing, and the first preset inclined plane is gradually close to the central axis of the cylindrical cavity from the first end to the second end of the second preset inclined plane; the direction from the first end to the second end of the second preset inclined plane is opposite to the direction from the first end to the second end of the first preset inclined plane.

Furthermore, the number of the first clamping blocks is multiple, and the multiple first clamping blocks are sequentially arranged along the circumferential direction of the cylindrical cavity; and/or the second fixture blocks are multiple, and the second fixture blocks are sequentially arranged along the circumferential direction of the cylindrical cavity.

Furthermore, the side surface of the fixture block assembly, which faces the coiled tubing, is provided with a sawtooth part, and the sawtooth part is in contact with the tube wall of the coiled tubing so as to relatively fix the fixture block assembly and the coiled tubing.

The centralizer further comprises an induction piece, wherein at least part of the induction piece is arranged on the outer side of the shell and is used for mutually inducing an induction component at a preset position close to a wellhead in the well section; and/or the rollers are divided into one or more roller groups which are arranged at intervals along the extension direction of the cylindrical cavity; the roller group comprises one or more rollers, and the rollers of the roller group are arranged around the cylindrical cavity at intervals in the circumferential direction.

By applying the technical scheme of the utility model, the centralizer comprises a shell and a plurality of rollers, wherein the shell comprises a first shell part and a second shell part, and the first shell part and the second shell part jointly enclose a cylindrical cavity for accommodating the coiled tubing; the first shell part is provided with a first end and a second end along the circumferential direction of the cylindrical cavity, and the second shell part is provided with a first end and a second end; the first end of the first shell part is rotatably connected with the first end of the second shell part, and a rotating axis between the first end of the first shell part and the first end of the second shell part is parallel to the central axis of the cylindrical cavity; the second end of the first shell part and the second end of the second shell part are detachably connected, so that the second end of the first shell part and the second end of the second shell part can be flexibly opened and closed; each roller is rotatably arranged on the shell around a corresponding preset axis, at least part of each roller is positioned on the outer side of the shell, and the preset axis is perpendicular to the central axis of the cylindrical cavity.

In a specific implementation process, the second end of the first housing part and the second end of the second housing part are detached, so that the first housing part can rotate around an axis parallel to the central axis of the cylindrical cavity, and/or the second housing part can rotate around an axis parallel to the central axis of the cylindrical cavity, and the coiled tubing can be conveniently installed in or detached from the cylindrical cavity; and after the coiled tubing is installed in the cylindrical cavity, the second end of the first shell part is connected with the second end of the second shell part, so that the first shell part and the second shell part are relatively fixed.

When the second end of the first shell part is connected with the second end of the second shell part, the cavity wall of the cylindrical cavity is in contact with the coiled tubing in the cylindrical cavity, so that the shell and the coiled tubing in the cylindrical cavity are relatively fixed, the coiled tubing is basically kept in a central position in a direction perpendicular to the tube axis of the coiled tubing, and the shell can centralize the coiled tubing. The utility model provides a centralizer is more convenient with coiled tubing's dismouting for coiled tubing's centering operation simplifier has solved among the prior art and has carried out the very inconvenient problem of the mode of centering to coiled tubing.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

figure 1 shows a schematic structural view of a centraliser according to a first embodiment of the utility model;

FIG. 2 shows a cross-sectional view at A-A of the centralizer of FIG. 1;

FIG. 3 shows a cross-sectional view at B-B of the centralizer of FIG. 1;

FIG. 4 illustrates a schematic view of the first and second housing portions of the centralizer of FIG. 3;

FIG. 5 shows a schematic view of the fastener of the centralizer of FIG. 3;

figure 6 shows a schematic structural view of a centraliser according to a second embodiment of the utility model;

figure 7 shows a schematic structural view of a centraliser according to a third embodiment of the utility model;

fig. 8 shows a schematic structural diagram of the first fixture block of the centralizer arranged between the wall of the cylindrical cavity and the coiled tubing.

Wherein the figures include the following reference numerals:

10. a housing; 11. a first housing portion; 111. a first rotation hole; 113. a first connection hole; 12. a second housing portion; 121. a second rotation hole; 123. a second connection hole; 13. a cylindrical cavity; 131. a second inclined plane; 14. accommodating grooves; 15. a step structure; 20. a roller; 21. positioning the shaft; 31. a first rotating shaft; 32. a second rotating shaft; 33. a connecting member; 34. a third rotating shaft; 40. a fastener; 41. a fastener body; 42. a flange portion; 51. a first fixed shaft; 52. a second fixed shaft; 53. a fixing member; 60. a sensing member; 71. a first clamping block; 711. a first serration; 712. a first inclined plane; 72. a second fixture block;

200. a coiled tubing.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The utility model provides a centralizer, please refer to fig. 1 to 8, the centralizer comprises a housing 10 and a plurality of rollers 20, the housing 10 comprises a first housing part 11 and a second housing part 12, the first housing part 11 and the second housing part 12 jointly enclose a cylindrical cavity 13 for accommodating a coiled tubing 200; wherein, along the circumference of the cylindrical cavity 13, the first housing part 11 has a first end and a second end, and the second housing part 12 has a first end and a second end; the first end of the first housing part 11 is rotatably connected with the first end of the second housing part 12, and a rotation axis between the first end of the first housing part 11 and the first end of the second housing part 12 is parallel to a central axis of the cylindrical cavity 13; the second end of the first housing part 11 and the second end of the second housing part 12 are detachably connected to realize flexible opening and closing between the second end of the first housing part 11 and the second end of the second housing part 12; each roller 20 is rotatably mounted on the housing 10 about a respective predetermined axis, at least part of each roller 20 being located outside the housing 10, the predetermined axis being perpendicular to the central axis of the cylindrical cavity 13.

In a specific implementation, the second end of the first housing part 11 and the second end of the second housing part 12 are detached, so that the first housing part 11 can rotate around an axis parallel to the central axis of the cylindrical cavity 13, and/or the second housing part 12 can rotate around an axis parallel to the central axis of the cylindrical cavity 13, thereby facilitating the installation and detachment of the coiled tubing 200 into and from the cylindrical cavity 13; after the coiled tubing 200 is installed in the cylindrical cavity 13, the second end of the first housing portion 11 and the second end of the second housing portion 12 are connected to fix the first housing portion 11 and the second housing portion 12 relative to each other.

When the second end of the first housing part 11 and the second end of the second housing part 12 are connected, the wall of the cylindrical cavity 13 contacts the coiled tubing 200 in the cylindrical cavity 13, so that the housing 10 and the coiled tubing 200 in the cylindrical cavity 13 are relatively fixed, and the coiled tubing 200 is substantially kept in a central position in a direction perpendicular to the pipeline center line of the coiled tubing 200, so that the housing 10 can centralize the coiled tubing 200. The centralizer of this application is more convenient with coiled tubing 200's dismouting for coiled tubing 200's centering operation simplistic has solved among the prior art and has carried out the very inconvenient problem of the mode of centering to coiled tubing 200.

In the specific implementation process, the sleeve is arranged in the well, and the peripheral wall of the sleeve is in contact with the well wall, so that the sleeve has a reinforcing effect on the well wall; coiled tubing 200 is normally located in the casing and so the centralizer is also located in the casing, and by having the casing 10 relatively fixed with coiled tubing 200 within the cylindrical cavity 13, coiled tubing 200 is prevented from swinging within the casing in a direction perpendicular to the centerline of coiled tubing 200.

Because the shell 10 and the coiled tubing 200 in the cylindrical cavity 13 are relatively fixed, when the coiled tubing 200 ascends or descends, the shell 10 moves synchronously with the coiled tubing 200, so that the shell 10 moves relative to the wall of the well section; by arranging the rollers 20, and because at least part of each roller 20 is positioned on the outer side of the casing 10, when the casing 10 moves downwards along with the coiled tubing 200 synchronously, each roller 20 rolls along the well wall of the well section, that is, sliding friction between the casing 10 and the well wall is converted into rolling friction between the rollers 20 and the well wall, so that the resistance of the casing 10 and the coiled tubing 200 therein to move in the well is reduced, and further, the pumping speed is increased. Moreover, the wear rate of the shell 10 can be reduced by arranging the rollers 20, and the service life of the centralizer is prolonged.

In addition, compared with the existing electrically-driven crawler, the centralizer does not need to be additionally provided with any driver, is small in installation space, and is suitable for a drilling fluid supply channel with limited space; moreover, the centralizer is good in stability and free of side turning and the like.

Specifically, the number of the preset axes is plural, and the plural preset axes are provided in one-to-one correspondence with the plural rollers 20.

Specifically, the first housing portion 11 and the second housing portion 12 are each a semi-cylindrical housing.

In the present embodiment, as shown in fig. 2 to 4 and fig. 6, a first engagement manner between the first end of the first housing portion 11 and the first end of the second housing portion 12 is as follows: the centralizer further comprises a first rotating shaft 31, a second rotating shaft 32 and a connecting piece 33, a first rotating hole 111 is formed in the first end of the first shell portion 11, the first rotating shaft 31 penetrates through the first rotating hole 111, and the central axis of the first rotating shaft 31 is parallel to the central axis of the cylindrical cavity 13; a second rotating hole 121 is formed in the first end of the second housing portion 12, a second rotating shaft 32 is arranged in the second rotating hole 121 in a penetrating manner, and the central axis of the second rotating shaft 32 is parallel to the central axis of the cylindrical cavity 13; the first rotating shaft 31 and the second rotating shaft 32 are both connected with a connecting piece 33, so that the connection between the first end of the first housing part 11 and the first end of the second housing part 12 is realized through the connecting piece 33; the first housing portion 11 is rotatably disposed around a central axis of the first rotating shaft 31, and/or the second housing portion 12 is rotatably disposed around a central axis of the second rotating shaft 32, that is, one of the first housing portion 11 and the second housing portion 12 may be rotatable, or both the first housing portion 11 and the second housing portion 12 may be rotatable.

Specifically, the first rotating shaft 31 and the connecting member 33 are relatively fixed, and the second rotating shaft 32 and the connecting member 33 are relatively fixed.

Specifically, the first rotation hole 111 extends to both ends of the first housing part 11 along the extending direction of the cylindrical cavity 13, and the second rotation hole 121 extends to both ends of the second housing part 12 along the extending direction of the cylindrical cavity 13.

Specifically, the end surface of the first end portion of the first housing portion 11 is an arc-shaped surface, and the central axis of the end surface of the first end portion of the first housing portion 11 is parallel to the central axis of the cylindrical cavity 13; and/or the end surface of the first end of the second housing part 12 is an arc-shaped surface, and the central axis of the end surface of the first end of the second housing part 12 is parallel to the central axis of the cylindrical cavity 13; in this way, the first housing part 11 and the second housing part 12 can be rotated relative to each other, and the first end structure of the first housing part 11 and the first end structure of the second housing part 12 can be prevented from affecting the rotation therebetween.

Alternatively, the connecting member 33 is a plate-like structure.

Specifically, the first setting manner of the connecting member 33 is: along the extending direction of the cylindrical cavity 13, the housing 10 has two ends, and the connecting piece 33 is arranged outside one of the ends of the housing 10; optionally, the first rotating shaft 31 and the second rotating shaft 32 are both arranged on the connecting piece 33 in a penetrating manner; further, the number of the connecting members 33 is two, and the two connecting members 33 are respectively disposed outside both end portions of the housing 10.

Specifically, the second setting manner of the connecting member 33 is: a first mounting groove is formed in the first housing part 11, a second mounting groove communicated with the first mounting groove is formed in the second housing part 12, and the connecting piece 33 is arranged in the first mounting groove and the second mounting groove; the first rotating shaft 31 and the second rotating shaft 32 are both arranged on the connecting piece 33 in a penetrating way; alternatively, a first mounting slot is provided at a first end of the first housing part 11 and a second mounting slot is provided at a first end of the second housing part 12.

Optionally, the first mounting grooves and the second mounting grooves are multiple, the multiple first mounting grooves are arranged at intervals along the extending direction of the cylindrical cavity 13, the multiple second mounting grooves are arranged at intervals along the extending direction of the cylindrical cavity 13, the multiple first mounting grooves and the multiple second mounting grooves are arranged in a one-to-one correspondence manner, and each first mounting groove is communicated with the corresponding second mounting groove; the number of the connecting pieces 33 is multiple, the connecting pieces 33 are arranged in one-to-one correspondence with the first mounting grooves, the connecting pieces 33 are arranged in one-to-one correspondence with the second mounting grooves, and each connecting piece 33 is arranged in the corresponding first mounting groove and the corresponding second mounting groove; the first rotating shaft 31 is sequentially inserted into the plurality of connectors 33, and the second rotating shaft 32 is sequentially inserted into the plurality of connectors 33.

Optionally, the first mounting groove and the second mounting groove are both rectangular grooves.

Specifically, the connecting member 33 is provided with a first through hole for the first rotating shaft 31 to pass through and a second through hole for the second rotating shaft 32 to pass through.

In the present embodiment, as shown in fig. 7, the second engagement manner between the first end of the first housing part 11 and the first end of the second housing part 12 is: the centralizer further comprises a third rotating shaft 34, a third rotating hole is formed in the first end of the first shell portion 11, a fourth rotating hole is formed in the first end of the second shell portion 12, a hole center line of the third rotating hole is overlapped with a hole center line of the fourth rotating hole, the third rotating shaft 34 penetrates through the third rotating hole and the fourth rotating hole, the first shell portion 11 and/or the second shell portion 12 are/is rotatably arranged around the central axis of the third rotating shaft 34, and the central axis of the third rotating shaft 34 is parallel to the central axis of the cylindrical cavity 13; that is, one of the first housing portion 11 and the second housing portion 12 may be rotatable, or both the first housing portion 11 and the second housing portion 12 may be rotatable.

Specifically, a first end of the first housing part 11 is convexly provided with a first protruding portion along the circumferential direction of the cylindrical cavity 13, a first end of the second housing part 12 is convexly provided with a second protruding portion along the circumferential direction of the cylindrical cavity 13, a third rotating hole is arranged on the first protruding portion, and a fourth rotating hole is arranged on the second protruding portion; i.e. the first and second protrusions are distributed along the extension of the cylindrical cavity 13.

Specifically, the number of the first protruding portions is multiple, and the multiple first protruding portions are arranged at intervals along the extending direction of the cylindrical cavity 13; the third rotating hole comprises a plurality of third hole sections, the third hole sections are arranged on the first protruding portions in a one-to-one correspondence mode, and hole center lines of the third hole sections are overlapped to form a hole center line of the third rotating hole; the second protruding parts are arranged at intervals along the extending direction of the cylindrical cavity 13; the fourth rotating hole comprises a plurality of fourth hole sections, the fourth hole sections are arranged on the second protruding portions in a one-to-one correspondence mode, and hole center lines of the fourth hole sections are overlapped to form a hole center line of the fourth rotating hole; the plurality of first protruding portions and the plurality of second protruding portions are arranged in a staggered manner in sequence along the extending direction of the cylindrical cavity 13.

In the present embodiment, as shown in fig. 2 to 5 and 7, a first engagement manner between the second end of the first housing portion 11 and the second end of the second housing portion 12 is as follows: the centralizer further comprises a fastener 40, a second end of the first housing part 11 is provided with a first connection hole 113, and a second end of the second housing part 12 is provided with a second connection hole 123; the fastening member 40 is inserted into the first connecting hole 113 and the second connecting hole 123 to fix the first housing part 11 and the second housing part 12 relatively.

Specifically, the distribution direction of the first and second connection holes 113 and 123 is perpendicular to the extension direction of the cylindrical cavity 13.

Specifically, the fastener 40 includes a fastener body 41 and a flange portion 42 protruding on an outer wall of the fastener body 41, the fastener body 41 being inserted into the first connection hole 113 and the second connection hole 123; the hole wall of the first connection hole 113 or the hole wall of the second connection hole 123 is provided with a step structure 15, the flange portion 42 has two end portions along the penetrating direction of the fastener body 41, and one end face of the flange portion 42 is in limit abutting contact with the step surface of the step structure 15.

Optionally, in the penetrating direction of the fastener body 41, the fastener body 41 has a first end and a second end, the flange portion 42 is located at the first end of the fastener body 41, and an end surface of the flange portion 42 close to the second end of the fastener body 41 is in limit abutment with the step surface of the step structure 15.

Optionally, the fastener body 41 is rod-shaped, and the extending direction of the fastener body 41 is the same as the penetrating direction thereof; the flange part 42 is of an annular structure, and the flange part 42 is arranged around the circumference of the fastener body 41; the step structure 15 is a ring structure.

Specifically, the fastener 40 is a bolt.

In the present embodiment, as shown in fig. 6, the second engagement manner between the second end of the first housing part 11 and the second end of the second housing part 12 is as follows: the centralizer further comprises a first fixed shaft 51, a second fixed shaft 52 and a fixing piece 53, wherein the axial direction of the first fixed shaft 51 is parallel to the extending direction of the cylindrical cavity 13, and the first fixed shaft 51 penetrates through the second end of the first shell part 11; the axial direction of the second fixed shaft 52 is parallel to the extending direction of the cylindrical cavity 13, and the second fixed shaft 52 is arranged at the second end of the second housing part 12 in a penetrating way; the first and second

fixed shafts

51 and 52 are connected to a fixing member 53.

Specifically, the second end of the first housing part 11 has a first fixing hole for the first fixing shaft 51 to pass through, and the second end of the second housing part 12 has a second fixing hole for the second fixing shaft 52 to pass through.

Specifically, the first fixed shaft 51 is fixed to the first housing part 11, the second fixed shaft 52 is fixed to the second housing part 12, and both the first fixed shaft 51 and the second fixed shaft 52 are fixed to the fixing member 53.

Specifically, the first fixed shaft 51 is inserted into the fixing member 53, and the second fixed shaft 52 is inserted into the fixing member 53.

Specifically, the fixing piece 53 is provided at one of the ends of the housing 10.

Alternatively, the fixing piece 53 is provided outside one of the end portions of the housing 10; when the fixing members 53 are two, the two fixing members 53 are respectively disposed outside both end portions of the housing 10.

Alternatively, a first fixing groove is formed on the first housing part 11, a second fixing groove communicated with the first fixing groove is formed on the second housing part 12 to form a fixing groove part at one end of the housing 10, and the fixing member 53 is disposed in the fixing groove part, that is, the fixing member 53 is disposed in the first fixing groove and the second fixing groove; when the mounting 53 is two, fixed slot portion is two, and two fixed slot portions set up respectively at two tip of casing 10, and the both ends along the extending direction of cylindricality cavity 13 of first casing portion 11 all are provided with first fixed slot promptly, and in the extending direction's of cylindricality cavity 13 both ends of second casing portion 12 all were provided with the second fixed slot, two first fixed slots set up and communicate with two second fixed slots in one-to-one respectively to form two fixed slot portions.

Specifically, there are two fixing elements 53, two first fixing shafts 51 and two second fixing shafts 52, the two first fixing shafts 51 are respectively arranged in one-to-one correspondence with the two fixing elements 53, and each first fixing shaft 51 is connected to the corresponding fixing element 53; the two second fixing shafts 52 are respectively disposed in one-to-one correspondence with the two fixing members 53, and each second fixing shaft 52 is connected to a corresponding fixing member 53.

In this embodiment, the outer wall surface of the housing 10 is recessed inward to form a plurality of receiving grooves 14, a plurality of rollers 20 are disposed corresponding to the plurality of receiving grooves 14, and each roller 20 is disposed in the corresponding receiving groove 14.

Specifically, the centralizer further comprises a plurality of positioning shafts 21, the plurality of rollers 20 and the plurality of positioning shafts 21 are arranged in a one-to-one correspondence manner, and each roller 20 is rotatably sleeved on the corresponding positioning shaft 21 around the central axis of the corresponding positioning shaft 21; the central axis of each positioning shaft 21 forms a predetermined axis corresponding to the corresponding roller 20.

Specifically, a plurality of positioning shafts 21 are provided in one-to-one correspondence with a plurality of receiving grooves 14, and each positioning shaft 21 is fixedly provided in a corresponding receiving groove 14.

In this embodiment, the rollers 20 are divided into one or more roller groups, and the roller groups are arranged at intervals along the extending direction of the cylindrical cavity 13; the roller group comprises one or more rollers 20, and the rollers 20 of the roller group are arranged at intervals around the circumference of the cylindrical cavity 13.

In particular, the roller 20 and the housing 10 are detachable, so that the service life of the centralizer can be prolonged by replacing the roller 20.

In this embodiment, the centralizer still includes response 60, and the outside at the casing 10 is installed to the outside of response 60 at least part and be used for with the well section in be close to the response part of the preset position department of well head mutually induction, and preset position setting is in the well section and is close to the well head setting promptly, and preset position department is provided with the response part, and then confirms the position of centralizer to when the centralizer is fast to reach the well head department, the staff can know in advance.

Specifically, the sensing member 60 is a magnet; for example, the sensing element 60 is a rubidium magnet.

Specifically, the outer wall surface of the housing 10 is provided with a positioning groove, and at least a portion of the sensing member 60 is mounted in the positioning groove.

Alternatively, when the housing 10 is disposed in a vertical direction, the sensing member 60 is disposed at an upper end of the housing 10.

Specifically, a plurality of centralizers of the present application are provided on the coiled tubing 200 in the extending direction of the coiled tubing 200.

In the specific implementation process, an operation area is arranged on the ground close to a wellhead, and when the pipe section of the coiled tubing 200 on which the centralizer is to be installed moves to the operation area, the centralizer is installed on the pipe section of the coiled tubing 200 on which the centralizer is to be installed in the operation area. The centralizer of this application can open and shut in a flexible way, is convenient for install the centralizer of this application in coiled tubing 200's optional position, and then reaches the purpose that effectively prevents coiled tubing 200 auto-lock in the pit.

In the specific implementation process, when it is determined that the centralizer blocks on the coiled tubing 200 reach the wellhead, that is, when the centralizer blocks are close to the wellhead, the ascending speed of the coiled tubing 200 can be slowed down in advance, so that the movement speed of the centralizer blocks on the coiled tubing 200 is slowed down, the centralizer blocks on the coiled tubing 200 can be conveniently and accurately transferred to an operation area, the centralizer blocks on the coiled tubing 200 can be removed in the operation area, collision between the centralizer blocks reaching the wellhead and the wellhead or parts at the wellhead due to uncertain positions of the centralizer blocks is avoided, and the coiled tubing 200 is prevented from being damaged.

In this embodiment, the centralizer further includes a fixture block assembly, the fixture block assembly is disposed between the cavity wall of the cylindrical cavity 13 and the coiled tubing 200 in the cylindrical cavity 13, and the fixture block assembly is used for being fixed relative to the coiled tubing 200; at least part of the contact surface between the fixture block assembly and the cavity wall of the cylindrical cavity 13 is a preset inclined surface; along the moving direction of the coiled tubing 200, the preset inclined plane has a first end and a second end, and the preset inclined plane gradually approaches to the central axis of the cylindrical cavity 13 from the first end to the second end of the preset inclined plane; wherein, the moving direction of the coiled tubing 200 is parallel to or the same as the axial direction of the cylindrical cavity 13.

It should be noted that the moving direction of the coiled tubing 200 refers to the moving direction of the coiled tubing 200; along the extending direction of the coiled tubing 200, the coiled tubing 200 has a first end and a second end, and when the coiled tubing 200 moves in the direction from the first end to the second end of the coiled tubing 200, the direction from the first end of the preset slope to the second end thereof is the same as the direction from the first end to the second end of the coiled tubing 200; because the clamping block assembly is relatively fixed with the coiled tubing 200, the clamping block assembly is driven to move synchronously when the coiled tubing 200 moves; when the fixture block assembly moves, the fixture block assembly slides along the contact surface of the cavity wall of the cylindrical cavity 13, which is used for contacting with the fixture block assembly, and at the moment, the contact surface of the cavity wall of the cylindrical cavity 13, which is used for contacting with the fixture block assembly, can generate an axial force for preventing the fixture block assembly from moving and a radial force for pushing the fixture block assembly to the direction close to the central axis of the cylindrical cavity 13, so that the fixture block assembly is more stably contacted with the coiled tubing 200, the shell 10 is more stably contacted with the fixture block assembly, the fixture block assembly is further firmly and relatively fixed with the coiled tubing 200, the shell 10 and the fixture block assembly are firmly and relatively fixed, and the risk that the fixture block assembly and the shell 10 are separated from the coiled tubing 200 when the coiled tubing 200 moves is avoided. When the coiled tubing 200 moves along the direction from the second end to the first end of the coiled tubing 200, the direction from the first end to the second end of the preset inclined plane is opposite to the direction from the first end to the second end of the coiled tubing 200, and the matching manner of the fixture assembly, the coiled tubing 200 and the housing 10 is the same as that described above, so the details are not repeated.

It should be noted that the axial force for preventing the movement of the latch assembly is parallel to the axial direction of the cylindrical cavity 13, and the radial force for pushing the latch assembly to the direction close to the central axis of the cylindrical cavity 13 is perpendicular to the axial direction of the cylindrical cavity 13.

Specifically, as shown in fig. 8, the cartridge assembly includes a first cartridge 71, the first cartridge 71 is disposed between a cavity wall of the cylindrical cavity 13 and the coiled tubing 200 inside the cylindrical cavity 13, the first cartridge 71 is configured to be fixed relative to the coiled tubing 200, and at least a portion of a contact surface between the first cartridge 71 and the cavity wall of the cylindrical cavity 13 is a first preset inclined surface; along the moving direction of the coiled tubing 200, the first preset inclined plane has a first end and a second end, and the first preset inclined plane gradually approaches to the central axis of the cylindrical cavity 13 from the first end to the second end of the first preset inclined plane; the direction from the first end to the second end of the first preset inclined plane is the same as the direction from the first end to the second end of the coiled tubing 200; when the coiled tubing 200 moves along the direction from the first end to the second end of the coiled tubing 200, the first fixture block 71 is driven to move synchronously when the coiled tubing 200 moves because the first fixture block 71 is fixed relative to the coiled tubing 200; when the first fixture block 71 moves, the first fixture block 71 slides along the contact surface of the cavity wall of the cylindrical cavity 13, which is used for contacting with the first fixture block 71, and at this time, the contact surface of the cavity wall of the cylindrical cavity 13, which is used for contacting with the first fixture block 71, generates an axial force for preventing the first fixture block 71 from moving and a radial force for pushing the first fixture block 71 to a direction close to the central axis of the cylindrical cavity 13, so that the first fixture block 71 is more stably contacted with the coiled tubing 200, the housing 10 is more stably contacted with the fixture block assembly, and further the first fixture block 71 is firmly and relatively fixed with the coiled tubing 200, and the housing 10 is firmly and relatively fixed with the fixture block assembly.

It should be noted that the axial force for preventing the first latch 71 from moving is parallel to the axial direction of the cylindrical cavity 13, and the radial force for pushing the first latch 71 toward the direction close to the central axis of the cylindrical cavity 13 is perpendicular to the axial direction of the cylindrical cavity 13.

Specifically, the first inclined surface 712 in fig. 8 is at least a portion of the contact surface of the first latch 71 facing the cavity wall of the cylindrical cavity 13; the second inclined surface 131 in fig. 8 is at least part of a contact surface of the cavity wall of the cylindrical cavity 13 for contacting with the first latch 71; the first inclined surface 712 is in close contact with the second inclined surface 131.

Alternatively, the first fixture block 71 is multiple, and the multiple first fixture blocks 71 are sequentially arranged along the circumferential direction of the cylindrical cavity 13.

Specifically, the fixture block assembly further comprises a second fixture block 72, the second fixture block 72 is arranged between the cavity wall of the cylindrical cavity 13 and the coiled tubing 200 in the cylindrical cavity 13, and the second fixture block 72 is used for being fixed relative to the coiled tubing 200; the second fixture blocks 72 and the first fixture blocks 71 are distributed at intervals along the axial direction of the cylindrical cavity 13; at least part of a contact surface between the second fixture block 72 and the cavity wall of the cylindrical cavity 13 is a second preset inclined surface; along the moving direction of the coiled tubing 200, the second preset inclined plane has a first end and a second end, and the first preset inclined plane gradually approaches to the central axis of the cylindrical cavity 13 from the first end to the second end of the second preset inclined plane; the direction from the first end to the second end of the second preset inclined plane is opposite to the direction from the first end to the second end of the first preset inclined plane; that is, the direction from the first end to the second end of the second preset inclined plane is opposite to the direction from the first end to the second end of the coiled tubing 200; when the coiled tubing 200 moves along the direction from the second end to the first end of the coiled tubing 200, the second fixture block 72 is driven to move synchronously when the coiled tubing 200 moves because the second fixture block 72 is fixed relative to the coiled tubing 200; when the second fixture block 72 moves, the second fixture block 72 slides along the contact surface of the cavity wall of the cylindrical cavity 13, which is used for contacting with the second fixture block 72, and at this time, the contact surface of the cavity wall of the cylindrical cavity 13, which is used for contacting with the second fixture block 72, generates an axial force for preventing the second fixture block 72 from moving and a radial force for pushing the second fixture block 72 to a direction close to the central axis of the cylindrical cavity 13, so that the second fixture block 72 is more stably contacted with the coiled tubing 200, the housing 10 is more stably contacted with the fixture block assembly, and further the second fixture block 72 is firmly and relatively fixed with the coiled tubing 200, and the housing 10 is firmly and relatively fixed with the fixture block assembly.

It should be noted that the axial force for preventing the second latch 72 from moving is parallel to the axial direction of the cylindrical cavity 13, and the radial force for pushing the second latch 72 toward the direction close to the central axis of the cylindrical cavity 13 is perpendicular to the axial direction of the cylindrical cavity 13.

It should be noted that, by providing the first fixture block 71 and the second fixture block 72, when the coiled tubing 200 is lifted up and pressed down in the well, the first fixture block 71 or the second fixture block 72 can clamp the coiled tubing 200, so as to ensure that the relative position of the centralizer and the coiled tubing 200 is fixed, and further, the centralizer can bear a certain tensile capacity, thereby ensuring that the centralizer cannot be separated from and loosened from the coiled tubing 200 when the coiled tubing 200 is in downhole blockage.

Optionally, the number of the second fixture blocks 72 is multiple, and the multiple second fixture blocks 72 are sequentially arranged along the circumferential direction of the cylindrical cavity 13.

In this embodiment, the side of the cartridge assembly facing the coiled tubing 200 is provided with serrations which contact the wall of the coiled tubing 200 to secure the cartridge assembly and the coiled tubing 200 relative to each other, i.e., to secure the centralizer to the coiled tubing 200 via the serrations.

Specifically, a first sawtooth part 711 is arranged on the side surface of the first fixture block 71 facing the coiled tubing 200, the first sawtooth part 711 comprises a plurality of first sawteeth sequentially arranged along the axial direction of the cylindrical cavity 13, and each first sawtooth is provided with a connecting end connected with the side surface of the first fixture block 71 and a contact end contacted with the coiled tubing 200; from the direction of the connecting end of each first saw tooth to the contact end thereof, each first saw tooth is gradually inclined toward the first end of the coiled tubing 200, so that the first saw tooth part 711 forms an inverted tooth structure, and then when the coiled tubing 200 moves along the direction from the first end to the second end of the coiled tubing 200, the first fixture block 71 can more firmly clamp the coiled tubing 200 through the first saw tooth part 711, and further firmly fix the centralizer on the coiled tubing 200.

Specifically, a side surface of the second fixture block 72 facing the coiled tubing 200 is provided with a second sawtooth part, the second sawtooth part comprises a plurality of second sawteeth sequentially arranged along the axial direction of the cylindrical cavity 13, and each second sawtooth part is provided with a connecting end connected with the side surface of the second fixture block 72 and a contact end contacted with the coiled tubing 200; from the direction of the link end of each second sawtooth to its contact end, each second sawtooth sets up towards the slope of coiled tubing 200's second end gradually to make the second sawtooth portion form the pawl structure, and then when coiled tubing 200 followed the direction motion from coiled tubing 200's second end to first end, second fixture block 72 can block coiled tubing 200 through the second sawtooth portion more firmly, and then firmly fix the centralizer on coiled tubing 200.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

in the centralizer provided by the utility model, the centralizer comprises a shell 10 and a plurality of rollers 20, wherein the shell 10 comprises a first shell part 11 and a second shell part 12, and the first shell part 11 and the second shell part 12 jointly enclose a cylindrical cavity 13 for accommodating a coiled tubing 200; wherein, along the circumference of the cylindrical cavity 13, the first housing part 11 has a first end and a second end, and the second housing part 12 has a first end and a second end; the first end of the first housing part 11 is rotatably connected with the first end of the second housing part 12, and a rotation axis between the first end of the first housing part 11 and the first end of the second housing part 12 is parallel to a central axis of the cylindrical cavity 13; the second end of the first housing part 11 and the second end of the second housing part 12 are detachably connected to realize flexible opening and closing between the second end of the first housing part 11 and the second end of the second housing part 12; each roller 20 is rotatably mounted on the housing 10 about a respective predetermined axis, at least part of each roller 20 being located outside the housing 10, the predetermined axis being perpendicular to the central axis of the cylindrical cavity 13.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A centralizer, comprising:

a housing (10), the housing (10) comprising a first housing portion (11) and a second housing portion (12), the first housing portion (11) and the second housing portion (12) together enclosing a cylindrical cavity (13) for housing a coiled tubing (200); wherein, in the circumferential direction of the cylindrical cavity (13), the first housing part (11) has a first end and a second end, and the second housing part (12) has a first end and a second end; the first end of the first shell part (11) is rotationally connected with the first end of the second shell part (12), and a rotational axis between the first end of the first shell part (11) and the first end of the second shell part (12) is parallel to the central axis of the cylindrical cavity (13); the second end of the first housing part (11) and the second end of the second housing part (12) are detachably connected;

a plurality of rollers (20), each roller (20) being rotatably mounted on the housing (10) about a corresponding predetermined axis, at least a portion of each roller (20) being located outside the housing (10), the predetermined axis being perpendicular to the central axis of the cylindrical cavity (13).

2. The centralizer of claim 1, further comprising:

a first rotating shaft (31), wherein a first rotating hole (111) is formed in a first end of the first housing part (11), and the first rotating shaft (31) penetrates through the first rotating hole (111);

a second rotating hole (121) is formed in the first end of the second housing portion (12), and the second rotating shaft (32) penetrates through the second rotating hole (121);

the first rotating shaft (31) and the second rotating shaft (32) are connected with the connecting piece (33);

wherein the first housing part (11) is rotatably arranged around a central axis of the first rotational axis (31) and/or the second housing part (12) is rotatably arranged around a central axis of the second rotational axis (32).

3. The centralizer of claim 2,

a first mounting groove is formed in the first shell portion (11), a second mounting groove communicated with the first mounting groove is formed in the second shell portion (12), and the connecting piece (33) is arranged in the first mounting groove and the second mounting groove; the first rotating shaft (31) and the second rotating shaft (32) are arranged on the connecting piece (33) in a penetrating mode; and/or

The end face of the first end part of the first shell part (11) is an arc-shaped face; and/or

The end face of the first end part of the second shell part (12) is an arc-shaped face.

4. The centralizer of claim 3,

the first mounting grooves and the second mounting grooves are multiple, the first mounting grooves are arranged at intervals along the extending direction of the cylindrical cavity (13), and the first mounting grooves are communicated with the second mounting grooves in a one-to-one correspondence manner;

the number of the connecting pieces (33) is multiple, the connecting pieces (33) and the first mounting grooves are arranged in a one-to-one correspondence manner, and each connecting piece (33) is arranged in the corresponding first mounting groove and the corresponding second mounting groove; the first rotating shaft (31) penetrates through the connecting pieces (33) in sequence, and the second rotating shaft (32) penetrates through the connecting pieces (33) in sequence.

5. The centralizer of claim 1, further comprising:

third pivot (34), the first end of first casing portion (11) is provided with the third and rotates the hole, the first end of second casing portion (12) is provided with the fourth and rotates the hole, the hole heart line in third rotation hole with the hole heart line coincidence in fourth rotation hole, third pivot (34) are worn to establish the third rotate the hole with the fourth rotates downtheholely, first casing portion (11) and/or second casing portion (12) wind the central axis of third pivot (34) rotationally sets up.

6. A centraliser according to claim 5, wherein the first end of the first housing part (11) is provided with a first protruding portion protruding in the circumferential direction of the cylindrical cavity (13), the first end of the second housing part (12) is provided with a second protruding portion protruding in the circumferential direction of the cylindrical cavity (13), the third turning hole is provided on the first protruding portion, and the fourth turning hole is provided on the second protruding portion.

7. The centralizer of claim 1, further comprising:

a fastener (40), a first connecting hole (113) is arranged at the second end of the first shell part (11), and a second connecting hole (123) is arranged at the second end of the second shell part (12); the fastener (40) penetrates through the first connecting hole (113) and the second connecting hole (123) so that the first shell portion (11) and the second shell portion (12) are relatively fixed.

8. The centralizer of claim 1, further comprising:

the axial direction of the first fixed shaft (51) is parallel to the extending direction of the cylindrical cavity (13), and the first fixed shaft (51) penetrates through the second end of the first shell part (11);

the axial direction of the second fixed shaft (52) is parallel to the extending direction of the cylindrical cavity (13), and the second fixed shaft (52) penetrates through the second end of the second shell part (12);

and the fixing piece (53), and the first fixing shaft (51) and the second fixing shaft (52) are connected with the fixing piece (53).

9. The centralizer of claim 1, further comprising:

the fixture block assembly is arranged between the wall of the cylindrical cavity (13) and the coiled tubing (200) in the cylindrical cavity (13) and is used for being fixed relative to the coiled tubing (200); at least part of a contact surface between the fixture block assembly and the cavity wall of the cylindrical cavity (13) is a preset inclined surface; the preset inclined plane is provided with a first end and a second end along the moving direction of the coiled tubing (200), and the preset inclined plane is gradually close to the central axis of the cylindrical cavity (13) from the first end to the second end of the preset inclined plane; wherein the moving direction of the coiled tubing (200) is parallel to or the same as the axial direction of the cylindrical cavity (13).

10. The centralizer of claim 9, wherein the cartridge assembly comprises:

at least part of a contact surface between the first fixture block (71) and the cavity wall of the cylindrical cavity (13) is a first preset inclined surface; the first preset inclined plane is provided with a first end and a second end along the moving direction of the coiled tubing (200), and the first preset inclined plane is gradually close to the central axis of the cylindrical cavity (13) from the first end to the second end of the first preset inclined plane;

the second fixture block (72) and the first fixture block (71) are distributed at intervals along the axial direction of the cylindrical cavity (13); at least part of a contact surface between the second fixture block (72) and the cavity wall of the cylindrical cavity (13) is a second preset inclined surface; the second preset inclined plane is provided with a first end and a second end along the moving direction of the coiled tubing (200), and the first preset inclined plane is gradually close to the central axis of the cylindrical cavity (13) from the first end to the second end of the second preset inclined plane; the direction from the first end to the second end of the second preset inclined plane is opposite to the direction from the first end to the second end of the first preset inclined plane.

11. The centralizer of claim 10,

the number of the first clamping blocks (71) is multiple, and the multiple first clamping blocks (71) are sequentially arranged along the circumferential direction of the cylindrical cavity (13); and/or

The number of the second clamping blocks (72) is multiple, and the second clamping blocks (72) are sequentially arranged along the circumferential direction of the cylindrical cavity (13).

12. The centralizer of claim 9, wherein the cartridge assembly is provided with serrations on a side facing the coiled tubing (200), the serrations contacting a wall of the coiled tubing (200) to secure the cartridge assembly and the coiled tubing (200) relative to each other.

13. The centralizer of claim 1,

the centralizer further comprises a sensing piece (60), wherein at least part of the sensing piece (60) is installed on the outer side of the shell (10) and is used for mutually sensing a sensing component at a preset position close to a wellhead in a well section; and/or

The rollers (20) are divided into one or more roller groups which are arranged at intervals along the extension direction of the cylindrical cavity (13); the roller group comprises one or more rollers (20), and the rollers (20) of the roller group are arranged around the cylindrical cavity (13) at intervals in the circumferential direction.