CN113585999B

CN113585999B - Expansion pipe

Info

Publication number: CN113585999B
Application number: CN202110803233.5A
Authority: CN
Inventors: 霍进; 吴宝成; 路宗羽; 石建刚; 席传明; 党文辉; 鞠鹏飞; 宋琳
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2023-05-26
Anticipated expiration: 2041-07-15
Also published as: CN113585999A

Abstract

The invention provides an expansion pipe. The expansion pipe includes: the two ends of the pipe body are overlapped at least partially, and the overlapped parts of the two ends of the pipe body are provided with unidirectional meshing sections, so that the two ends of the pipe body can only move along the direction of reducing the area of the overlapped parts respectively; the expansion structure is arranged in the pipe body and is detachably connected with the pipe body, and the expansion structure expands outwards to squeeze the pipe body so as to expand the pipe diameter of the pipe body to a target pipe diameter; the first clamping piece is arranged on the pipe body, and after the expansion pipe is put into the sleeve, the first clamping piece can form a stop clamping position with the wall of the sleeve so that the expansion pipe stays at the position to be reinforced of the sleeve. The invention solves the problem of poor reinforcement effect of the expansion pipe in the prior art.

Description

Expansion pipe

Technical Field

The invention relates to the technical field of petroleum equipment, in particular to an expansion pipe.

Background

After the oil field development enters the middle and later stages, the damage of the sleeve in the oil and gas well can occur, the normal production of the oil and gas well can be directly influenced by the damage of the sleeve, even the oil and gas well is scrapped, and the repair work of the damaged sleeve of the oil and gas well is an important work in the oil field development process.

At present, the casing damage treatment mainly adopts the technological means of shaping, milling, reinforcing, casing taking and the like, and the casing reinforcing is an important casing damage treatment technology. Several conventional sleeve reinforcement methods adopted at present, such as explosion welding and corrugated pipe sleeve reinforcement technology, have high requirements on the tightness of the pipe column. The corrugated pipe reinforcement technology uses epoxy glue to bond and seal with the sleeve, has low fixing strength, is easy to fall off, has poor high temperature resistance and is not suitable for steam injection thermal production wells; the explosion welding reinforcement technology can only be used for well sections with larger external constraint force of the casing, and is not suitable for repairing oil and gas wells with shallow burial, loose stratum cementation and unevaluated well cementation quality.

In order to solve the above problems, there has been developed an expanded pipe reinforcing technique for repairing and reinforcing a damaged portion of a casing by using an increase in diameter of an expanded pipe in a well. However, after the construction is finished, the existing expansion pipe is easy to shrink inwards under the pressure action of surrounding rock of a shaft, so that the purpose of reinforcing and repairing cannot be achieved, and the reinforcing effect of the expansion pipe is greatly influenced.

From the above, the prior art has a problem that the reinforcement effect of the expansion pipe is poor.

Disclosure of Invention

The invention mainly aims to provide a reinforced expansion pipe for solving the problem of poor reinforcement effect of an expansion pipe in the prior art.

In order to achieve the above object, the present invention provides an expansion pipe comprising: the two ends of the pipe body are overlapped at least partially, and the overlapped parts of the two ends of the pipe body are provided with unidirectional meshing sections, so that the two ends of the pipe body can only move along the direction of reducing the area of the overlapped parts respectively; the expansion structure is arranged in the pipe body and is detachably connected with the pipe body, and the expansion structure expands outwards to squeeze the pipe body so as to expand the pipe diameter of the pipe body to a target pipe diameter; the first clamping piece is arranged on the pipe body, and after the expansion pipe is put into the sleeve, the first clamping piece can form a stop clamping position with the wall of the sleeve so that the expansion pipe stays at the position to be reinforced of the sleeve.

Further, the expanding structure comprises: the pull ring is connected with the lifting rope; the pull ring is arranged at the top end of the pull rod, the pull rod is provided with a moving groove penetrating along the radial direction of the pull rod, and the moving groove extends along the axial direction of the pull rod; the positioning piece is sleeved on the pull rod, a positioning groove is formed in the pipe body, and at least one part of the positioning piece stretches into the positioning groove and forms a stop position with the positioning groove so that the expansion structure is positioned in the pipe body; the expansion piece is sleeved on the pull rod and is in sliding connection with the pull rod, the expansion piece is far away from the pull ring relative to the positioning piece, and when the pull rod is pulled upwards, the expansion piece expands outwards to squeeze the pipe body, so that the pipe diameter of the pipe body is enlarged.

Further, the positioning member includes: the locating piece main body is sleeved on the pull rod; the positioning pin penetrates through the moving groove and is respectively connected with two ends of the positioning piece main body, so that the positioning piece cannot rotate along the radial direction of the pull rod; the support rods are rotatably connected with the positioning piece main body, one ends of the support rods extend into the positioning grooves and form stop positioning with the positioning grooves, the support rods are multiple, and the support rods are arranged at intervals along the circumferential direction of the pull rods.

Further, the positioning member body has a rotation recess in which at least a portion of the support rod is accommodated, and one end of the support rod near the positioning member body is inclined downward and has a stopper protrusion so that the support rod is stopped by the positioning member body when rotated to be perpendicular to the pull rod.

Further, the expansion member includes: a first connection ring; the first connecting ring and the second connecting ring are sleeved on the pull rod and are arranged at intervals; the first connecting rod, one end of the first connecting rod is rotatably connected with the first connecting ring; the first connecting rods and the second connecting rods are correspondingly arranged and are a plurality of, and the first connecting rods and the second connecting rods are arranged at intervals along the circumferential direction of the pull rod;

the roller is arranged at the joint of the first connecting rod and the second connecting rod, and when the first connecting rod and the second connecting rod shrink in opposite directions, the roller moves outwards to extrude the pipe body.

Further, the expansion structure further comprises a first elastic piece, wherein the first elastic piece is sleeved on the pull rod and is respectively abutted with the first connecting ring and the second connecting ring.

Further, the expansion piece is one or more, and when the expansion piece is a plurality of, a plurality of expansion pieces are arranged in sequence along the axial direction of the pull rod, and the first connecting ring of the expansion piece close to the positioning piece is connected with the positioning piece.

Further, the expanding structure further comprises a stop piece, wherein the stop piece is arranged at the bottom end of the pull rod and detachably connected with the pull rod, so that when the pull rod is pulled upwards, the stop piece drives the expanding piece to slide upwards.

Further, the pull rod comprises a first section and a second section which are connected in sequence, the outer diameter of the first section is larger than that of the second section, the inner diameter of the positioning piece and the inner diameter of the expanding piece are matched with the outer diameter of the second section, and the moving groove is formed in the second section.

Further, the first clamping piece is rotatably connected with the pipe body, the first clamping piece is arranged at an angle with the pipe body and faces the direction far away from the pipe body, the first clamping pieces are multiple, and the first clamping pieces are arranged at intervals along the circumferential direction of the pipe body.

Further, the expansion pipe further comprises a second elastic piece, wherein the second elastic piece is connected with the pipe body and the first clamping piece respectively and used for providing elastic force capable of clamping a blocking stop with the pipe wall of the sleeve to the first clamping piece.

Further, the expansion pipe further comprises a plurality of second clamping pieces, the second clamping pieces and the first clamping pieces are arranged in a staggered mode, the second clamping pieces are arranged on the outer surface of the pipe body at intervals, and the extending directions of the second clamping pieces are parallel to the axial direction of the pipe body.

By applying the technical scheme of the invention, the expansion pipe comprises a pipe body, an expansion structure and a first clamping part, two ends of the pipe body are overlapped at least partially, a unidirectional meshing section is arranged at the overlapping position of the two ends of the pipe body, so that the two ends of the pipe body can only move along the direction of reducing the area of the overlapping position respectively, the expansion structure is arranged in the pipe body and is detachably connected with the pipe body, the expansion structure expands outwards to extrude the pipe body, the pipe diameter of the pipe body is expanded to the target pipe diameter, the first clamping part is arranged on the pipe body, after the expansion pipe is put into a sleeve, the first clamping part can form a stop clamping position with the pipe wall of the sleeve, so that the expansion pipe stays at the position to be reinforced of the sleeve, and then the expansion pipe body is outwards expanded and extruded through the expansion structure, so that the pipe diameter of the pipe body is enlarged, and the expansion pipe can only outwards expand and cannot inwards contract due to the existence of the unidirectional meshing section, so that the expansion pipe diameter of the expansion pipe can always keep the target expansion pipe diameter, and the reinforcement effect of the expansion pipe is poor in the prior art is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 illustrates a cross-sectional view of an expansion vessel in one embodiment of the invention;

FIG. 2 shows a schematic view of an angle configuration of an expansion vessel in accordance with an embodiment of the present invention;

FIG. 3 shows a schematic view of another angle of the expansion vessel in an embodiment of the invention;

fig. 4 shows a schematic structural view of a positioning member in an embodiment of the present invention.

Wherein the above figures include the following reference numerals:

10. a tube body; 11. a unidirectional engagement section; 12. a positioning groove; 20. a first clamping piece; 30. a pull ring; 40. a pull rod; 41. a moving groove; 42. a first section; 43. a second section; 50. a positioning piece; 51. a positioning member main body; 511. a rotation concave portion; 512. a connection section; 52. a positioning pin; 53. a support rod; 531. a stop boss; 60. an expansion member; 61. a first connection ring; 62. a second connecting ring; 63. a first connecting rod; 64. a second connecting rod; 65. a roller; 70. a first elastic member; 80. a stopper; 90. a second elastic member; 100. and the second clamping piece.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that 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 unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

The invention provides an expansion pipe for solving the problem of poor reinforcement effect of the expansion pipe in the prior art.

As shown in fig. 1 to 3, the expansion pipe includes a pipe body 10, an expansion structure, and a first stopper 20. The two ends of the pipe body 10 are overlapped at least partially after being rolled, and the overlapped parts of the two ends of the pipe body 10 are provided with unidirectional meshing sections 11, so that the two ends of the pipe body 10 can only move along the direction of reducing the area of the overlapped parts respectively. The expansion structure is arranged in the pipe body 10 and detachably connected with the pipe body 10, and the expansion structure expands outwards to squeeze the pipe body 10 so as to expand the pipe diameter of the pipe body 10 to a target pipe diameter. The first clamping piece 20 is arranged on the pipe body 10, and after the expansion pipe is put into the sleeve, the first clamping piece 20 can form a stop clamping position with the wall of the sleeve, so that the expansion pipe stays at the position to be reinforced of the sleeve.

The expansion pipe comprises a pipe body 10, an expansion structure and a first clamping piece 20, wherein after the two ends of the pipe body 10 are rolled and overlapped, at least part of the two ends of the pipe body 10 are mutually overlapped, a unidirectional meshing section 11 is arranged at the overlapped part of the two ends of the pipe body 10, so that the two ends of the pipe body 10 can only move along the direction of reducing the area of the overlapped part respectively, the expansion structure is arranged in the pipe body 10 and detachably connected with the pipe body 10, the expansion structure expands outwards to extrude the pipe body 10, so that the pipe diameter of the pipe body 10 expands to a target pipe diameter, the first clamping piece 20 is arranged on the pipe body 10, after the expansion pipe is put into a sleeve, the first clamping piece 20 can form a stop clamping position with the pipe wall of the sleeve, so that the expansion pipe stays at the position to be reinforced of the sleeve, and then the expansion pipe can be accurately positioned at the position to be reinforced of the sleeve through the first clamping piece 20, the expansion pipe 10 can expand outwards through the expansion structure, so that the pipe diameter of the pipe body 10 can expand outwards and cannot shrink inwards due to the existence of the unidirectional meshing section 11, the expansion pipe diameter of the expansion pipe can be expanded outwards, the expansion pipe can not shrink inwards, the expansion pipe diameter of the expansion pipe can be prevented from expanding outwards, and the expansion pipe diameter of the expansion pipe can always be kept at the target pipe diameter under the effect of a well bore is ensured, and the expansion effect is always kept.

Specifically, two unidirectional engaging sections 11 are disposed at the winding positions of two ends of the pipe body 10, and the two unidirectional engaging sections 11 are respectively disposed on two coincident end surfaces of two ends of the pipe body 10 and extend along the circumferential direction of the pipe body 10. Wherein the length of the unidirectional engagement section 11 is greater than or equal to the length of the overlapping portion of the two ends of the pipe body 10 in the circumferential direction of the pipe body 10. The two unidirectional engagement sections 11 are in an engaged inverted tooth structure. The tube body 10 can only move in the direction of increasing the tube diameter and cannot move in the direction of decreasing the tube diameter under the extrusion of the expansion structure. It will be appreciated that the area where the two ends of the pipe body 10 overlap gradually decreases during the pipe diameter of the pipe body 10 increases.

As shown in fig. 1-3, the expanding structure includes a pull ring 30, a pull rod 40, a positioning member 50, and an expanding member 60. The pull ring 30 is connected with a lifting rope. The pull ring 30 is arranged at the top end of the pull rod 40, when the expansion pipe is used, the pull ring 30 is used as a connecting fixed end of the expansion pipe, the lifting rope is fixed on the pull ring 30, and then the expansion pipe is placed down in a well. The tie rod 40 has a movement groove 41 penetrating in the radial direction of the tie rod 40, and the movement groove 41 extends in the axial direction of the tie rod 40. The positioning member 50 is sleeved on the pull rod 40, the pipe body 10 is internally provided with a positioning groove 12, and at least one part of the positioning member 50 stretches into the positioning groove 12 and forms a stop position with the positioning groove 12 so as to position the expansion structure in the pipe body 10. The expansion piece 60 is sleeved on the pull rod 40 and is in sliding connection with the pull rod 40, the expansion piece 60 is far away from the pull ring 30 relative to the positioning piece 50, and when the pull rod 40 is pulled upwards, the expansion piece 60 expands outwards to squeeze the pipe body 10, so that the pipe diameter of the pipe body 10 is enlarged.

As shown in fig. 1-2, the drawbar 40 includes a first segment 42 and a second segment 43 connected in series. The outer diameter of the first section 42 is larger than the outer diameter of the second section 43, the inner diameter of the positioning member 50 and the inner diameter of the expanding member 60 are both adapted to the outer diameter of the second section 43, and the moving groove 41 is provided on the second section 43. The first segment 42 can thus form a positive stop for the positioning member 50.

As shown in fig. 1 and 4, the positioning member 50 includes a positioning member main body 51, a positioning pin 52, and a support rod 53. The positioning member main body 51 is sleeved on the pull rod 40. Specifically, the positioning member main body 51 has a middle cross beam and hollow portions located at both sides of the cross beam, the middle cross beam is accommodated in the moving groove 41, and the pull rod 40 passes through the hollow portions, so that the positioning member main body 51 can move along the axial direction of the pull rod 40. The positioning pins 52 pass through the moving grooves 41 and are respectively connected with both ends of the positioning member main body 51 so that the positioning member 50 cannot rotate in the radial direction of the tie rod 40. Specifically, the positioning member main body further includes a connection section 512, and the connection section 512 is U-shaped. After the positioning member main body 51 is sleeved on the pull rod 40, the two extending sections of the connecting section 512 are respectively located at two sides of the pull rod 40 and are provided with openings, the expansion member 60 is provided with connecting holes, the positioning pin 52 respectively penetrates through the connecting holes of the expansion member 60, the openings of the connecting section 512 and the moving groove 41, so that the positioning member 50 is connected with the expansion member 60, and the radial rotation of the positioning member 50 along the pull rod 40 is limited. The supporting rods 53 are rotatably connected with the positioning piece main body 51, one ends of the supporting rods 53 extend into the positioning grooves 12 and form stop positioning with the positioning grooves 12, the supporting rods 53 are multiple, and the supporting rods 53 are arranged at intervals along the circumferential direction of the pull rod 40.

As shown in fig. 4, the positioning member main body 51 has a rotation recess 511, and at least a part of the support rod 53 is accommodated in the rotation recess 511. The end of the support rod 53 near the positioning member main body 51 is inclined downward and has a stopper protrusion 531 so that the support rod 53 is stopped by the positioning member main body 51 when rotated to be perpendicular to the tie rod 40. Specifically, in this embodiment, the number of the support rods 53 is two, the positioning member main body 51 has two cantilevers symmetrically arranged, the rotation concave portion 511 is provided on the cantilevers, the outer ends of the cantilevers have pin holes, and correspondingly, the support rods 53 are also provided with pin holes, and the rotation pins pass through the cantilever and the pin holes of the support rods 53, so that the support rods 53 are rotationally connected with the cantilevers. The stop protrusion 531 forms a stop with the cantilever when the support lever 53 is rotated to be parallel to the cantilever. The length of the support rod 53 is related to the target tube diameter of the expansion tube. When the support rod 53 is rotated to be parallel to the cantilever, the expansion pipe is expanded to the target pipe diameter, or the expansion pipe is already expanded to the target pipe diameter before the support rod 53 is rotated to be parallel to the cantilever. This ensures that the support rod 53 is always stopped by the positioning groove 12, and prevents the expansion structure from being separated from the tube 10.

It is emphasized that the weight of the end of the support rod 53 having the stopper protrusion 531 is greater than the other end, so that in a natural state, the support rod 53 keeps the end having the stopper protrusion 531, i.e., the end near the retainer main body 51, inclined downward.

As shown in fig. 1, the expansion member 60 includes a first connection ring 61, a second connection ring 62, a first connection rod 63, a second connection rod 64, and a roller 65. The first connecting ring 61 and the second connecting ring 62 are sleeved on the pull rod 40 and are arranged at intervals. One end of the first connection rod 63 is rotatably connected to the first connection ring 61. One end of the second connecting rod 64 is rotatably connected with the second connecting ring 62, the other end of the second connecting rod 64 is rotatably connected with the other end of the first connecting rod 63, the first connecting rod 63 and the second connecting rod 64 are correspondingly arranged and are multiple, and the first connecting rod 63 and the second connecting rod 64 are arranged at intervals along the circumference of the pull rod 40. The roller 65 is disposed at the connection between the first connecting rod 63 and the second connecting rod 64, and when the first connecting rod 63 and the second connecting rod 64 contract in opposite directions, the roller 65 moves outwards to squeeze the tube 10.

Specifically, when the expansion member 60 is contracted in the axial direction of the tie rod 40, expansion in the radial direction of the tie rod 40 is achieved. When the expansion member 60 contracts along the axial direction of the pull rod 40, the included angle between the first connecting rod 63 and the second connecting rod 64 gradually decreases, that is, the first connecting rod 63 and the second connecting rod 64 gradually arch, so that the connection part of the first connecting rod 63 and the second connecting rod 64 moves outwards along the radial direction of the pull rod 40, and the roller 65 is driven to move outwards, thereby extruding the pipe body 10, and increasing the pipe diameter of the pipe body 10. It can be understood that, when the first connecting rod 63 and the second connecting rod 64 are contracted to the shortest position along the axial direction of the pull rod 40, the expansion distance between the first connecting rod 63 and the second connecting rod 64 along the radial direction of the pull rod 40 is maximized, and the pipe diameter of the pipe body 10 is exactly the target pipe diameter to which the pipe body 10 is to be expanded. Therefore, the pipe body 10 can be ensured to be accurately expanded to the target pipe diameter, and the pipe diameter of the pipe body 10 cannot be overlarge due to overlarge force of constructors. Further, by providing the roller 65, the sliding friction can be changed to the rolling friction, so that the force of the expansion member 60 contracting in the axial direction of the tie rod 40 is transmitted to the pipe body 10 to the maximum.

As shown in fig. 1, the expanded structure further includes a first elastic member 70. The first elastic member 70 is sleeved on the pull rod 40 and is respectively abutted against the first connecting ring 61 and the second connecting ring 62. The first elastic member 70 can provide a restoring force that expands the expansion element 60 in the axial direction of the tie rod 40.

In the present embodiment, the number of the expansion members 60 is one or more, and when the number of the expansion members 60 is plural, the expansion members 60 are sequentially arranged along the axial direction of the pull rod 40, and the first connection ring 61 of the expansion member 60 adjacent to the positioning member 50 is connected to the positioning member 50. Specifically, the first coupling ring 61 of the expansion member 60 adjacent to the positioning member 50 has the above-mentioned coupling holes, and the positioning pins 52 respectively pass through the coupling holes, the openings of the coupling sections 512, and the moving grooves 41, thereby coupling the positioning member 50 with the expansion member 60 adjacent to the positioning member 50.

As shown in fig. 1 and 3, the expanded structure further includes a stop 80. The stopper 80 is disposed at the bottom end of the pull rod 40 and detachably connected with the pull rod 40 such that the stopper 80 drives the expansion member 60 to slide upward when the pull rod 40 is pulled upward. Specifically, removal of the stop 80 allows the positioning member 50 and the expansion member 60 to be mounted to the pull rod 40.

As shown in fig. 1 to 2, the first clamping member 20 is rotatably connected with the pipe body 10, and the first clamping member 20 is disposed at an angle to the pipe body 10 and faces away from the pipe body 10. That is, the included angle between the first clamping members 20 and the axial direction of the pipe body 10 is an acute angle, so that the expansion pipe can be smoothly put into the casing, the plurality of first clamping members 20 are arranged, and the plurality of first clamping members 20 are arranged at intervals along the circumferential direction of the pipe body 10. In this embodiment, two first clamping members 20 are provided, and the two first clamping members 20 are symmetrically disposed at two sides of the tube body 10. Of course, the number of the first clamping members 20 can be more than two, so as to have a better stop positioning effect, and the first clamping members can be selected according to practical requirements.

As shown in fig. 1-2, the expanded tubular also includes a second resilient member 90. The second elastic member 90 is connected to the pipe body 10 and the first clamping member 20, respectively, and is used for providing elastic force for the first clamping member 20, which can be clamped with the pipe wall of the sleeve. This ensures that the first detent 20 has a sufficient stop effect. The first detent 20 and the second resilient member 90 cooperate to permit movement of the expanded tubular only downwardly but not upwardly within the casing.

In this embodiment, the first elastic member 70 and the second elastic member 90 are both springs.

As shown in fig. 2 to 3, the expansion tube further comprises a second detent 100. The second clamping member 100 is arranged in a staggered manner with respect to the first clamping member 20. The second clamping pieces 100 are multiple, the second clamping pieces 100 are arranged on the outer surface of the pipe body 10 at intervals, and the extending direction of the second clamping pieces 100 is parallel to the axial direction of the pipe body 10. By providing the second clamping member 100, which is complementary to the first clamping member 20, it is further ensured that the expansion pipe can be accurately positioned at the position of the casing to be reinforced.

The reinforcing process of the expansion pipe in this embodiment will be specifically described below.

When the casing of the oil-gas well is damaged, the oil outlet pipe and the oil-well pump are started from the oil-gas well, and the position and the shape of the damaged casing are determined by the logging cable. Then the logging cable is pulled out, the pull ring 30 of the expansion pipe in the embodiment is fixed with one end of the lifting rope, then the expansion pipe is put into an oil-gas well, and the pipe body 10 can be put into the well together with the expansion structure without being separated due to the stop positioning between the supporting rod 53 and the positioning groove 12. The expansion pipe can be continuously put into the well under the action of self gravity until reaching the position to be reinforced of the sleeve. Under the combined action of the first clamping member 20, the second elastic member 90 and the second clamping member 100, the pipe body 10 will be clamped at the position to be reinforced of the sleeve. When the lifting rope is pulled up, as the supporting rod 53 of the positioning piece 50 is clamped in the positioning groove 12 at this time, the pull rod 40 passes through the positioning piece 50 and drives the stop piece 80 to move upwards, and the stop piece 80 presses the expansion piece 60, so that the expansion piece 60 expands outwards, and the pipe diameter of the pipe body 10 correspondingly increases. The lifting rope is continuously lifted until the pipe body 10 is expanded to the target pipe diameter. At this time, the hanging rope is lowered, the expansion piece 60 is contracted inwards by the restoring force of the first elastic piece 70, and the supporting rod 53 is separated from the positioning groove 12, so that the expansion structure is separated from the pipe body 10. And then the expansion structure is lifted out of the oil-gas well, and the pipe body 10 stays at the position to be reinforced of the sleeve, so that the whole reinforcing process is completed.

As can be seen from the above-described process, the expansion pipe in the present embodiment achieves an increase in the pipe diameter of the pipe body 10 mainly by converting the upward pulling force applied to the pull rod 40 into the radial pressing force on the pipe body 10.

From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the expansion pipe comprises a pipe body 10, an expansion structure and a first clamping piece 20, wherein after the two ends of the pipe body 10 are rolled and overlapped, at least part of the two ends of the pipe body 10 are mutually overlapped, a unidirectional meshing section 11 is arranged at the overlapped part of the two ends of the pipe body 10, so that the two ends of the pipe body 10 can only move along the direction of reducing the area of the overlapped part respectively, the expansion structure is arranged in the pipe body 10 and detachably connected with the pipe body 10, the expansion structure expands outwards to extrude the pipe body 10, so that the pipe diameter of the pipe body 10 expands to a target pipe diameter, the first clamping piece 20 is arranged on the pipe body 10, after the expansion pipe is put into a sleeve, the first clamping piece 20 can form a stop clamping position with the pipe wall of the sleeve, so that the expansion pipe stays at the position to be reinforced of the sleeve, and then the expansion pipe can be accurately positioned at the position to be reinforced of the sleeve through the first clamping piece 20, the expansion pipe 10 can expand outwards through the expansion structure, so that the pipe diameter of the pipe body 10 can expand outwards and cannot shrink inwards due to the existence of the unidirectional meshing section 11, the expansion pipe diameter of the expansion pipe can be expanded outwards, the expansion pipe can not shrink inwards, the expansion pipe diameter of the expansion pipe can be prevented from expanding outwards, and the expansion pipe diameter of the expansion pipe can always be kept at the target pipe diameter under the effect of a well bore is ensured, and the expansion effect is always kept.

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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An expansion pipe, comprising:

the pipe body (10), the both ends of the pipe body (10) are overlapped at least partially after being rolled, and the overlapped part of the both ends of the pipe body (10) is provided with a unidirectional meshing section, so that the both ends of the pipe body (10) can only move along the direction of reducing the area of the overlapped part respectively;

the expansion structure is arranged in the pipe body (10) and detachably connected with the pipe body (10), and the expansion structure expands outwards to press the pipe body (10) so as to expand the pipe diameter of the pipe body (10) to a target pipe diameter;

the first clamping piece (20), the first clamping piece (20) is arranged on the pipe body (10), and after the expansion pipe is put into the sleeve, the first clamping piece (20) can form a stop clamping with the pipe wall of the sleeve so that the expansion pipe stays at the position to be reinforced of the sleeve;

the expanding structure comprises:

the pull ring (30), the said pull ring (30) is connected with lifting rope;

the pull ring (30) is arranged at the top end of the pull rod (40), the pull rod (40) is provided with a moving groove (41) penetrating through the pull rod (40) along the radial direction of the pull rod (40), and the moving groove (41) extends along the axial direction of the pull rod (40);

the locating piece (50) is sleeved on the pull rod (40), a locating groove (12) is formed in the pipe body (10), and at least one part of the locating piece (50) stretches into the locating groove (12) and forms a stop position with the locating groove (12) so that the expansion structure is positioned in the pipe body (10);

the expansion piece (60), the expansion piece (60) cover is established on pull rod (40) and with pull rod (40) sliding connection, expansion piece (60) for setting element (50) keep away from pull ring (30), when upwards pulling pull rod (40), expansion piece (60) outwards expands extrusion body (10), so that the pipe diameter of body (10) enlarges.

2. An expansion pipe according to claim 1, characterized in that the positioning element (50) comprises:

the positioning piece main body (51), the positioning piece main body (51) is sleeved on the pull rod (40);

the positioning pins (52) penetrate through the moving grooves (41) and are respectively connected with two ends of the positioning piece main body (51) so that the positioning piece (50) cannot rotate along the radial direction of the pull rod (40);

the support rods (53), the support rods (53) are rotatably connected with the positioning piece main body (51), one ends of the support rods (53) extend into the positioning grooves (12) and form stop positioning with the positioning grooves (12), the support rods (53) are multiple, and the support rods (53) are arranged at intervals along the circumferential direction of the pull rod (40).

3. An expansion pipe according to claim 2, characterized in that the positioning member main body (51) has a rotation concave portion (511), at least a part of the support rod (53) is accommodated in the rotation concave portion (511), and an end of the support rod (53) near the positioning member main body (51) is inclined downward and has a stopper convex portion (531) so that the support rod (53) is stopped by the positioning member main body (51) when rotated to be perpendicular to the pull rod (40).

4. An expansion pipe according to claim 1, characterized in that the expansion element (60) comprises:

a first connection ring (61);

the first connecting ring (61) and the second connecting ring (62) are sleeved on the pull rod (40) and are arranged at intervals;

a first connecting rod (63), wherein one end of the first connecting rod (63) is rotatably connected with the first connecting ring (61);

the second connecting rod (64), one end of the second connecting rod (64) is rotatably connected with the second connecting ring (62), the other end of the second connecting rod (64) is rotatably connected with the other end of the first connecting rod (63), the first connecting rod (63) and the second connecting rod (64) are correspondingly arranged and are multiple, and the first connecting rod (63) and the second connecting rod (64) are arranged at intervals along the circumference of the pull rod (40);

the roller (65), the roller (65) is arranged at the junction of the first connecting rod (63) and the second connecting rod (64), when the first connecting rod (63) and the second connecting rod (64) shrink in opposite directions, the roller (65) moves outwards to extrude the pipe body (10).

5. An expansion pipe according to claim 4, characterized in that the expansion structure further comprises a first elastic member (70), the first elastic member (70) being sleeved on the pull rod (40) and being in abutment with the first connection ring (61) and the second connection ring (62), respectively.

6. An expansion pipe according to claim 4, wherein one or more expansion elements (60) are provided, and when a plurality of expansion elements (60) are provided, a plurality of expansion elements (60) are provided in order along the axial direction of the tie rod (40), and a first connection ring (61) of the expansion element (60) adjacent to the positioning element (50) is connected to the positioning element (50).

7. The inflation tube of claim 1, wherein the inflation structure further comprises a stopper (80), the stopper (80) being disposed at a bottom end of the pull rod (40) and being detachably connected to the pull rod (40) such that when the pull rod (40) is pulled upward, the stopper (80) drives the inflation member (60) to slide upward.

8. Expansion pipe according to claim 1, characterized in that the pull rod (40) comprises a first section (42) and a second section (43) connected in sequence, the outer diameter of the first section (42) is larger than the outer diameter of the second section (43), the inner diameter of the positioning element (50) and the inner diameter of the expanding element (60) are matched with the outer diameter of the second section (43), and the moving groove (41) is arranged on the second section (43).

9. An expansion pipe according to any one of claims 1-8, characterized in that the first clamping members (20) are rotatably connected with the pipe body (10), the first clamping members (20) are arranged at an angle to the pipe body (10) and face away from the pipe body (10), the first clamping members (20) are a plurality, and a plurality of the first clamping members (20) are arranged at intervals along the circumferential direction of the pipe body (10).

10. An expanded pipe according to claim 9, characterized in that the expanded pipe further comprises a second elastic member (90), said second elastic member (90) being connected to the pipe body (10) and the first detent member (20), respectively, for providing the first detent member (20) with an elastic force that can be snapped into place with the pipe wall of the casing.

11. An expansion pipe according to any one of claims 1 to 8, further comprising a second clamping element (100), wherein the second clamping element (100) is arranged in a staggered manner with respect to the first clamping element (20), the second clamping element (100) is a plurality of clamping elements, the second clamping elements (100) are arranged on the outer surface of the pipe body (10) at intervals, and the extending directions of the second clamping elements (100) are parallel to the axial direction of the pipe body (10).