CN209886514U

CN209886514U - Pipe expander

Info

Publication number: CN209886514U
Application number: CN201822259234.4U
Authority: CN
Inventors: 丁明华; 传平; 贾鹏; 骆雷雷; 徐睿
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2018-12-30
Filing date: 2018-12-30
Publication date: 2020-01-03
Anticipated expiration: 2028-12-30

Abstract

The utility model provides a tube expander, including at least one bloated pipe fitting, the surface of bloated pipe fitting has the conical surface, stretches into the direction of waiting to restore the body along bloated pipe fitting, and the conical surface is close to the axis of bloated pipe fitting gradually, and the tapering of conical surface is less than 10%. The utility model provides a sleeve pipe damage repair expand tube tool's among the prior art repair effect poor problem.

Description

Pipe expander

Technical Field

The utility model relates to an oil field workover technical field particularly, relates to a tube expander.

Background

The cone of the existing pipe expanding tool for repairing damaged sleeves in oil fields is short, the oblique angle between the side face and the axial lead is too large, and a large down upset force is generated when a large-obtuse-angle pipe expander descends, so that the sleeves are easily further damaged, and the pipe expanding success rate is low. The expansion pipe needs strong horizontal expansion force, and down force is not needed. The pipe expander is short and mostly provided with reducing diameter, and is easy to be blocked during pipe expansion. Some tube expanders are movable (rotating or telescopic), have low strength and are easy to damage during tube expansion. Some pipe expanders can not wash the well.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a tube expander to solve the problem of poor repairing effect of the casing tube damage repairing tube expanding tool in the prior art.

In order to achieve the above object, the utility model provides an expander, including at least one bloated pipe fitting, the surface of bloated pipe fitting has the conical surface, stretches into the direction of waiting to restore the body along bloated pipe fitting, and the conical surface is close to the axis of bloated pipe fitting gradually, and the tapering of conical surface is less than 10%.

Further, the taper of the tapered surface is less than 3%.

Further, the expanding tube comprises a plurality of sub-components, the sub-components are sequentially connected to form the expanding tube, and the conical surface is formed by the outer surface of at least one sub-component.

Further, one end of the sub-parts has a convex structure, the other end of the sub-parts has a receiving groove, and the convex structure of one sub-part extends into the receiving groove of the other sub-part to connect the sub-parts in sequence.

Further, the expansion pipe fitting includes: the pipe expanding section is provided with a conical surface, and at least part of sub-components are sequentially connected according to the diameter to form the pipe expanding section; and the operating section is formed by at least one other part of the sub-components and is connected with the large-diameter end of the expansion pipe section.

Further, the diameter of the sub-part forming the operative section is equal to the maximum diameter of the expansion section.

Further, the expansion pipe fitting is a plurality of, and the diameter is different between each expansion pipe fitting.

Furthermore, the diameters of the expanded pipe fittings at positions which are the same distance away from one end of the expanded pipe fitting extending into the pipe body to be repaired are different among the expanded pipe fittings.

Further, the expansion pipe pieces are connected through screw threads, and the ratio of the outer wall thickness to the inner wall thickness of each screw thread is 0.618.

Further, the expand tube still includes the guide head, and the guide head is located the one end that the expand tube stretched into the body of waiting to restore to the guide expand tube stretches into the body of waiting to restore.

Further, the taper of the guide head is less than 5%, and the end part is hemispherical.

Further, the end of the expansion pipe far away from the guide head is provided with a connecting structure.

Further, the expansion pipe fitting is provided with a well washing through hole which is arranged in a penetrating mode.

Use the technical scheme of the utility model, the pipe expander includes at least one bloated pipe fitting, and the surface of bloated pipe fitting has the conical surface, stretches into the direction of treating the restoration body along bloated pipe fitting, and the conical surface is close to the axis of bloated pipe fitting gradually, and the tapering of conical surface is less than 10%.

The conical surface that the tapering is less than 10% is provided with through the surface at the expand tube spare to this embodiment, has increased the horizontal thrust outward of expander expand tube, has reduced the upset force, makes horizontal expansion force be more than 10 times of the upset force down under the circumstances of not counting frictional force, has improved the expand tube success rate.

Drawings

The accompanying drawings, which form a part of the present application, 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 and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a primary expansion pipe of the pipe expander of the present invention;

fig. 2 shows a schematic structural view of a second stage pipe expander of the present invention; and

fig. 3 shows a schematic structural diagram of a three-stage pipe expander of the present invention.

Wherein the figures include the following reference numerals:

10. a first-stage expansion pipe fitting; 11. a conical surface; 12. a sub-component; 13. a connecting structure; 20. expanding the pipe fitting in the second stage; 30. and (5) expanding the pipe fitting in the third stage.

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 accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, 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.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the poor problem of restoration effect of the sleeve pipe damage restoration expand tube instrument among the prior art, the utility model provides an expander.

The tube expander shown in fig. 1 comprises at least one tube expanding piece, wherein the outer surface of the tube expanding piece is provided with a conical surface 11, the conical surface 11 is gradually close to the axis of the tube expanding piece along the direction that the tube expanding piece extends into a tube body to be repaired, and the taper of the conical surface 11 is less than 10%.

The conical surface 11 with the taper smaller than 10% is arranged on the outer surface of the pipe expanding piece, the horizontal external thrust of the pipe expander is increased, the upset force is reduced, the horizontal expansion force is 10 times or more of the upset force without counting the friction force, and the pipe expanding success rate is improved.

Preferably, the taper of the tapered surface 11 is less than 3%.

Since the cross section of the pipe body to be repaired is generally circular, the expansion pipe in this embodiment is in the shape of an elongated cone to be matched with the pipe body to be repaired. Of course, the expansion element may also be provided in other shapes adapted to the tubular body to be repaired.

In the present embodiment, the expanding tube comprises a plurality of sub-members 12, each sub-member 12 is connected in sequence to form the expanding tube, and the tapered surface 11 is formed by the outer surface of at least one sub-member 12. Along the axis at the direction place that the expand tube stretched into the body of waiting to restore, the expand tube spare is divided into the multistage, connects through the mode of screw thread or buckle between each section sub-unit 12 to form whole expand tube spare.

Optionally, the expansion pipe pieces are connected by screw threads, and the ratio of the outer wall thickness to the inner wall thickness of the screw threads is 0.618.

Specifically, one end of the sub-members 12 has a projection structure, the other end of the sub-members 12 has a receiving recess, and the projection structure of one sub-member 12 projects into the receiving recess of the other sub-member 12 to connect the sub-members 12 in series. The male formation has an external thread and the receiving recess has an internal thread, the external thread and the internal thread cooperating to join the sub-members 12 together as a unit.

In this embodiment, the tube expansion part comprises a tube expansion section and an operation section, the tube expansion section is provided with a conical surface 11, at least a part of sub-parts 12 are sequentially connected according to the diameter to form the tube expansion section, and when the tube expansion part is used, the tube expansion section extends into the tube body to be repaired to repair the tube body; at least another part of the sub-components 12 forms an operation section which is connected with the large-diameter end of the expansion pipe section and is convenient for operation, and a conical connecting hole is arranged on the sub-component 12 at one end of the operation section, which is far away from the expansion pipe section, and is used as a connecting structure 13 for connecting other components.

Preferably, the diameter of the sub-part 12 forming the operative section is equal to the maximum diameter of the expansion section. That is, from the tube expansion section to the direction of operation section, the radius of the outer peripheral surface of tube expansion spare is kept unchangeable after increasing gradually earlier to make the outer peripheral surface of tube expansion spare whole body smooth.

In this embodiment, one expander comprises a plurality of expansion elements, each of which differs in diameter from the corresponding location. That is, the diameters of the expanded pipe members at positions of the expanded pipe members that are at the same distance from the end of the expanded pipe member that extends into the tubular body to be repaired are different between the expanded pipe members, and a transition dimension is left between the diameters of the expanded pipe members. Like this, the size between each expand pipe spare forms cascaded, uses expand pipe spare to carry out the expand pipe operation to waiting to restore the body according to the size of expand pipe spare from little to big in proper order when using to divide the gradual body expand of waiting to restore, prevent simultaneously that expand pipe spare from being broken, guaranteed the used repeatedly of restoration effect and tube expander.

In this embodiment, expand the pipe fitting and still include the guide head, and the guide head is located the one end that the expand pipe fitting stretched into the body of waiting to restore to the guide expand pipe fitting stretches into the body of waiting to restore. Preferably, the taper of the guide head is less than 5%, and the end part is hemispherical, so that the pipe expanding piece can be conveniently extended into the pipe body to be repaired.

As shown in fig. 1 to 3, the pipe expansion device in this embodiment is divided into a plurality of grades according to the diameter, wherein the pipe expansion device of the lower grade has a smaller diameter, and the pipe expansion device of the higher grade has a larger diameter. In this embodiment, three expansion pipe fittings are provided, which are divided into a first-stage expansion pipe fitting 10, a second-stage expansion pipe fitting 20, and a third-stage expansion pipe fitting 30, wherein the size of the third-stage expansion pipe fitting 30 is the final size required for repairing a pipe body to be repaired. Of course, more grades of expansion pipes can be arranged according to the requirement.

Optionally, in order to keep the pipe expander smoothly lowered, the pipe expander is provided with a well-flushing through hole penetrating through the pipe expander, and the size of the well-flushing through hole is generally larger. The expand tube spare diameter in this embodiment is 116mm, and length is 2m, therefore sets up the diameter that the well-flushing through-hole and is less than 20mm to the bulk strength of guarantee expand tube spare.

In this embodiment, because the hardness of the pipe body to be repaired is generally higher, the high pipe expander is made of a material with high hardness and high strength, the wall thickness strength of the pipe is high, and the material strength of the pipe expanding piece is higher than that of the pipe body to be repaired, so that the success rate of pipe expansion is improved, and the pipe expander can repair the pipe body to be repaired more effectively.

The use of the expander of this embodiment is as follows:

when the pipe repairing tool is used, the first-stage expansion pipe 10 is selected firstly, one end of the hemisphere of the first-stage expansion pipe 10 is inserted into a pipe body to be repaired, the pipe body to be repaired is repaired preliminarily, then the second-stage expansion pipe 20 is selected for further repairing the pipe body to be repaired, and finally the third-stage expansion pipe 30 is used for repairing the pipe body to be repaired and completing repairing of the pipe body to be repaired.

It should be noted that, a plurality in the above embodiments means at least two.

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

1. the problem of poor repairing effect of the pipe expanding tool for repairing damaged sleeves in the prior art is solved;

2. the expansion pipe fitting is formed by splicing a plurality of sub-parts, so that the expansion pipe fitting is convenient to process and assemble;

3. the pipe body to be repaired is gradually expanded by the plurality of pipe expanding pieces in a graded manner, so that the repairing effect and the repeated use of the pipe expander are ensured;

4. the whole structure is simple, and the use and the operation are convenient.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

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 is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 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 capable of operation in sequences other than those illustrated or described herein.

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. The tube expander is characterized by comprising at least one tube expanding piece, wherein the outer surface of the tube expanding piece is provided with a conical surface (11), the conical surface (11) is gradually close to the axis of the tube expanding piece along the direction that the tube expanding piece extends into a tube body to be repaired, and the taper of the conical surface (11) is less than 10%.

2. The expander according to claim 1, wherein the taper of said conical surface (11) is less than 3%.

3. The expander according to claim 1, wherein said expander member comprises a plurality of sub-members (12), each of said sub-members (12) being connected in series to form said expander member, and said tapered surface (11) being formed by an outer surface of at least one of said sub-members (12).

4. An expander as claimed in claim 3, wherein one end of said sub-members (12) has a male formation and the other end of said sub-members (12) has a female receiving recess, the male formation of one of said sub-members (12) projecting into the female receiving recess of the other of said sub-members (12) to connect said sub-members (12) in series.

5. The expander of claim 4, wherein the expansion tube comprises:

the expanding pipe section is provided with the conical surface (11), and at least a part of the sub-components (12) are sequentially connected according to the diameter size to form the expanding pipe section;

an operating section, at least another part of the sub-components (12) forming the operating section, the operating section being connected with the large diameter end of the expansion tube section.

6. An expander according to claim 5, wherein the diameter of the sub-part (12) forming the operative section is equal to the maximum diameter of the expansion tube section.

7. The expander of claim 1, wherein said expansion tube member is plural, and the diameter of said expansion tube member is different.

8. An expander as claimed in claim 7, wherein between the tube expansion members the diameters of the tube expansion members differ at a location at the same distance from the end of the tube expansion member extending into the tubular body to be repaired.

9. The expander of claim 7, wherein said expansion tubes are connected by a threaded connection, and wherein said threaded connection has a ratio of outer wall thickness to inner wall thickness of 0.618.

10. The expander according to claim 1, wherein the tube expander further comprises a guiding head at an end of the tube expander extending into the tubular body to be repaired for guiding the tube expander extending into the tubular body to be repaired.

11. The expander of claim 10, wherein the taper of the pilot head is less than 5% and the ends are hemispherical.

12. The expander according to claim 10, wherein an end of the tube expansion member remote from the guiding head has a connection structure (13).

13. The expander of claim 1, wherein the expansion tube has a washhole disposed therethrough.