CN216788325U

CN216788325U - Shale gas rebuilds pit shaft sleeve pipe centralizer

Info

Publication number: CN216788325U
Application number: CN202220469282.XU
Authority: CN
Inventors: 袁发勇; 豆瑞杰; 金学诗; 杨军海; 陈卫东; 董锐
Original assignee: Sinopec Oilfield Service Corp; Sinopec Jianghan Petroleum Engineering Co Ltd; Downhole Testing Co of Sinopec Jianghan Petroleum Engineering Co Ltd
Current assignee: Sinopec Oilfield Service Corp; Sinopec Jianghan Petroleum Engineering Co Ltd; Downhole Testing Co of Sinopec Jianghan Petroleum Engineering Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-06-21
Anticipated expiration: 2032-02-28

Abstract

The utility model relates to a shale gas reconstruction shaft casing centralizer, which comprises a plurality of centralizing blocks arranged on the surface of a casing, wherein the plurality of centralizing blocks are spirally distributed along the length direction of the casing, the surface of the casing is also provided with convex blocks, the centralizing blocks are correspondingly arranged on the convex blocks, and grooves matched with the convex blocks are formed in the centralizing blocks. In the using process of the utility model, the distribution tracks of the plurality of centralizing blocks on the surface of the casing can be connected into a complete circular ring shape, the centralizing blocks in all directions can be supported between the casing and the well wall from all directions, the casing is ensured to be centered, the plurality of centralizing blocks are combined to complete the action effect of the existing plurality of sleeved centralizers, the production material is greatly saved, and the production cost is reduced.

Description

Shale gas rebuilds pit shaft sleeve pipe centralizer

Technical Field

The utility model relates to the technical field of shale gas repeated fracturing, in particular to a shale gas reconstruction shaft casing centralizer.

Background

The shale gas exploitation repeated fracturing construction is to rebuild a 3.5 'casing in the original 5.5' casing, and perform well cementation operation between the 5.5 'casing and the 3.5' casing annulus to realize shaft rebuilding. The sleeve-in-sleeve fixing process has high requirement on the centering degree of the small sleeve, and the conventional centralizer has no characteristics of temperature resistance, good adhesion stability, high centering degree, low friction resistance, good perforating bullet penetrability and the like. The conventional casing centralizer is characterized in that a plurality of casing centralizers are sleeved on a casing, a plurality of casing centralizers are required to be used on the outer side of one pipeline at the same time, and casings of different specifications can only use the casing centralizers of corresponding specifications, so that the conventional casing centralizer is high in limitation and inconvenient to use.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a shale gas reconstruction wellbore casing centralizer which saves materials and is not limited by casing specification.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the shale gas reconstruction shaft casing centralizer comprises a plurality of centralizing blocks arranged on the surface of a casing, wherein the centralizing blocks are distributed spirally along the length direction of the casing, a convex block is further arranged on the surface of the casing, the centralizing blocks are correspondingly arranged on the convex block, and a groove matched with the convex block is formed in the centralizing block.

According to the scheme, the righting block is made of resin.

According to the scheme, the surfaces of the centralizing blocks and the convex blocks, which are in mutual contact, are provided with frosted grains, and glue is filled between the centralizing blocks and the convex blocks.

According to the scheme, the protruding block is further provided with a plurality of threaded blind holes, and the righting block is connected to the protruding block through a plurality of screws.

According to the scheme, the righting block is provided with a plurality of blind holes corresponding to the positions of the screws, and the screws are arranged in the blind holes of the righting block.

The shale gas reconstruction shaft casing centralizer has the following beneficial effects:

1. in the using process of the utility model, the distribution tracks of a plurality of centralizing blocks on the surface of the casing can be connected into a complete circular ring shape, the centralizing blocks in all directions can be supported between the casing and the well wall from all directions, the casing is ensured to be centered, and a plurality of centralizing blocks are combined to complete the action effect of the existing plurality of sleeved centralizers, thereby greatly saving production materials and reducing production cost;

2. the utility model can adjust the number of the righting blocks to be installed and the angular distance between the righting blocks in time according to the specification of the used casing, increases the volume between the original casing and the reconstructed shaft casing annulus to the maximum extent, is suitable for casings of different specifications, is more universal and is not limited;

3. the centering block is made of resin, has certain mobility and buffering effect, can slow down rigid friction force generated by friction between the centering block and a pipe wall, reduces impact on a sleeve, and has a better protection effect.

Drawings

The utility model will be further described with reference to the following drawings and examples, in which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic view of the connection structure of the centering block and the bump block of the present invention;

FIG. 4 is a schematic view of a bump structure according to the present invention;

FIG. 5 is a schematic view of the connecting surface structure of the centering block and the protruding block of the present invention;

in the figure: 1-casing, 2-centralizing block and 101-convex block.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1-4, the shale gas reconstruction wellbore casing centralizer comprises a plurality of centralizing blocks 2, wherein the plurality of centralizing blocks 2 are arranged on the surface of a casing 1, and the plurality of centralizing blocks 2 are spirally distributed along the length direction of the casing 1.

Furthermore, the centering block 2 is made of resin, so that the rigid friction force generated by friction between the centering block and the pipe wall can be relieved, and the impact on the sleeve is reduced.

Furthermore, the surface of the casing 1 is also provided with a convex block 101, and the centering block 2 is correspondingly arranged on the convex block 101.

Furthermore, set up the groove with protruding piece 101 adaptation on righting the piece 2, right the piece 2 cover and establish on protruding piece 2, can effectively avoid righting the piece 2 condition of moving about at the sleeve pipe 1 outer wall.

Further, the mutual contact surface of the centering block 2 and the convex block 101 is provided with frosted grains, glue is filled between the centering block 2 and the convex block 101 for adhesion, the installation is connected through the adhesion mode, and the connection mode is quick and simple.

Furthermore, still be provided with a plurality of screw thread blind holes on the protruding piece 101, right piece 2 through a plurality of screwed connection on protruding piece 101, set up the threaded connection means, strengthen the joint strength between right piece 2 and the sleeve pipe 1, strengthen full-time stability.

Furthermore, a plurality of blind holes corresponding to the positions of the screws are formed in the centering block 2, the screws are arranged in the blind holes of the centering block 2, the screws are not in contact with the well wall, the screws are stably hidden inside the centering block 2, and strong friction vibration caused by direct contact of the hard screws and the well wall is avoided.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides a pit shaft sleeve pipe centralizer is rebuild to shale gas, its characterized in that, is including installing a plurality of pieces of righting (2) on sleeve pipe (1) surface, and is a plurality of piece of righting (2) are the heliciform along sleeve pipe (1) length direction and distribute, and sleeve pipe (1) surface still is provided with protruding piece (101), piece of righting (2) are installed correspondingly on protruding piece (101), set up on piece of righting (2) with the groove of protruding piece (101) adaptation.

2. The shale gas reconstruction wellbore casing centralizer of claim 1, wherein the centralizer block (2) is a resin material.

3. The shale gas reconstruction wellbore casing centralizer of claim 1, wherein the surface of the centralizing block (2) in contact with the convex block (101) is provided with a frosted texture, and glue is filled between the centralizing block (2) and the convex block (101).

4. The shale gas reconstruction wellbore casing centralizer of claim 1, wherein the convex block (101) is further provided with a plurality of threaded blind holes, and the centralizing block (2) is connected to the convex block (101) through a plurality of screws.

5. The shale gas reconstruction wellbore casing centralizer of claim 4, wherein the centralizing block (2) is provided with a plurality of blind holes corresponding to the positions of screws, and the screws are arranged inside the blind holes of the centralizing block (2).