CN112031698B

CN112031698B - Combined anchoring slip

Info

Publication number: CN112031698B
Application number: CN202010906053.5A
Authority: CN
Inventors: 王传鸿; 汪建; 邹刚; 周歆; 李应虎; 李雄
Original assignee: SJS Ltd
Current assignee: SJS Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2024-07-02
Anticipated expiration: 2040-09-01
Also published as: CN112031698A

Abstract

The invention provides a compound anchoring slip, which comprises a slip body, slip tooth blocks and a fixing piece, wherein the slip tooth blocks are embedded on the slip body, stepped anchoring teeth are formed on the slip tooth blocks, and the fixing piece penetrates through the slip body and the slip tooth blocks to fix the slip body and the slip tooth blocks. Because the anchor teeth are formed on the slip tooth blocks, the slip tooth blocks have high load bearing capacity under the condition of high pressure loading, and the slip tooth blocks are simple in integral structure and easy to unseal and recycle.

Description

Combined anchoring slip

[ Field of technology ]

The invention relates to the technical field of downhole tools, in particular to a composite anchoring slip.

[ Background Art ]

Currently, as each large oil field well is deeper and deeper, the deep oil and gas well is explored and developed, and has the characteristics of complex geological conditions, high bottom hole pressure and the like.

In the production process, after the packer is in place along with the well completion string, the oil pipe and annulus channels are plugged by throwing balls or putting plugs into the well completion string. When the packer is set, pressing from an oil pipe, and enabling fluid to enter a hydraulic cylinder through a pressure transmission hole of a packer mandrel; under the action of hydraulic pressure, the setting shear pin on the packer piston is sheared firstly, so that the piston descends to push the upper cone to descend, the distance between the upper cone and the lower cone is gradually reduced, and the upper end and the lower end of the slip are outwards opened, so that the slip is anchored on the wall of the casing. When the packer is unpacked, the upper cone and the lower cone are reset, and then the upper end and the lower end of the slips rebound and shrink to be separated from the pipe wall.

But most slips for packers suffer from the following drawbacks: because of differences in material properties and use environments, slips often do not fully anchor to the wall of the casing, and thus do not function to secure the packer to the casing. At present, the requirements of the oil-water well on the use performance of the packer are higher and higher, and how to improve the anchoring mechanism to bear the load formed by the high pressure in the well is a problem to be solved urgently, but the existing well completion tool cannot meet the underground construction operation under the high pressure load.

In view of the foregoing, it would be desirable to provide a new composite anchoring slip that overcomes the above-described drawbacks.

[ Invention ]

The invention aims to provide a composite anchoring slip which can bear high load under the condition of high pressure load, has a simple integral structure and is easy to unseal and recycle.

In order to achieve the above purpose, the invention provides a composite anchoring slip, which comprises a slip body 1, slip tooth blocks 2 and a fixing piece 3, wherein the slip tooth blocks 2 are embedded on the slip body 1, stepped anchoring teeth 21 are formed on the slip tooth blocks 2, and the fixing piece 3 penetrates through the slip body 1 and the slip tooth blocks 2 to fix the slip body 1 and the slip tooth blocks 2.

Preferably, the slip body 1 includes a main body 11 and an i-shaped branch 12 connected to the main body 11; the cross section of the main body 11 is triangular, two sides of the main body 11 are formed with an included angle of 60 degrees, and one end of the main body 11 away from the branch 12 is formed with a slope.

Preferably, the top surface of the slip body 1 is provided with a groove 13, the groove 13 is provided on the main body 11, a plurality of threaded holes 131 are provided in the groove 13, and the plurality of threaded holes 131 are distributed in a straight line.

Preferably, a plurality of counter bores 22 are arranged on the slip tooth blocks 2, and the counter bores 22 are distributed in a straight line; the number of the fixing pieces 3 is a plurality, and the plurality of fixing pieces 3 correspondingly pass through the plurality of counter bores 22 and the plurality of threaded holes 131.

Preferably, the upper end surface of the slip tooth segment 2 is an arc surface, and the upper end surface of the slip tooth segment 2 forms a stepped anchoring tooth 21.

Preferably, the slip tooth segments 2 are embedded in the grooves 13, and the anchoring teeth 21 of the slip tooth segments 2 are arranged upwards.

Preferably, the anchoring teeth 21 have an included angle θ formed thereon, the included angle θ being 45 °.

Preferably, the fixing member 3 is provided with external threads.

Preferably, the slip body 1 is made of alloy steel material, and the fixing piece 3 is a hexagon socket screw.

Compared with the prior art, the composite anchoring slip has the beneficial effects that the anchoring teeth are formed on the slip tooth blocks, so that the composite anchoring slip has high load bearing capacity under the condition of high-pressure loading, and the composite anchoring slip is simple in integral structure and easy to unseal and recycle.

[ Description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a composite anchoring slip provided by the present invention.

Fig. 2 is a perspective view of a slip tooth segment of the composite anchored slip shown in fig. 1.

FIG. 3 is a side view of the slip tooth segment of FIG. 2.

Fig. 4 is a perspective view of the slip body of the composite anchored slip shown in fig. 1.

Fig. 5 is a perspective view of the fixture of the composite anchoring slip shown in fig. 1.

[ Detailed description ] of the invention

In order to make the objects, technical solutions and advantageous technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the invention, and not to limit the invention.

It is to be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. It will be apparent to those skilled in the art that the terms described above have the particular meaning in the present invention, as the case may be.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or the like, may include one or more such features, either explicitly or implicitly. Furthermore, the meaning of "a plurality of", "a number" means two or more, unless specifically defined otherwise.

Referring to fig. 1 to 5, the present invention provides a composite anchoring slip, which comprises a slip body 1, slip tooth blocks 2 and a fixing member 3, wherein the slip tooth blocks 2 are embedded on the slip body 1, and the fixing member 3 passes through the slip body 1 and the slip tooth blocks 2 to fix the slip body 1 and the slip tooth blocks 2. In this embodiment, the slip body 1 is made of alloy steel, and the fixing member 3 is a hexagon socket screw.

Further, the slip body 1 includes a main body 11 and an i-shaped branch 12 connected to the main body 11; the cross section of the main body 11 is triangular, two sides of the main body 11 are formed with an included angle of 60 degrees, and one end of the main body 11 away from the branch 12 is formed with a slope.

Further, the top surface of the slip body 1 is provided with a groove 13, the groove 13 is provided on the main body 11, a plurality of threaded holes 131 are provided in the groove 13, and the plurality of threaded holes 131 are distributed in a straight line. In this embodiment, the number of the plurality of screw holes 131 is two.

Further, the upper end face of the slip tooth segment 2 is an arc face, and the upper end face of the slip tooth segment 2 forms a stepped anchoring tooth 21, so that the high-strength anchoring performance is achieved. Specifically, the anchoring teeth 21 are formed with an included angle θ, which is 45 °. Therefore, due to the anchoring teeth 21, the slip tooth blocks 2 are easy to slip and release pressure on the inner wall of the cone and the sleeve when being matched with the packer, so that the slip tooth blocks 2 have high load bearing capacity, and due to the simple integral structure of the composite anchoring slip, the deblocking recovery is easy.

Further, the slip tooth segment 2 is provided with a plurality of counter bores 22 corresponding to the threaded holes 131, and the counter bores 22 are distributed in a straight line; the number of the fixing pieces 3 is a plurality, and the plurality of fixing pieces 3 correspondingly pass through the plurality of counter bores 22 and the plurality of threaded holes 131. In this embodiment, the number of the fixing members 3 is two, and the number of the counter bores 22 is two.

Further, the slip tooth segments 2 are embedded in the grooves 13, and the anchoring teeth 21 of the slip tooth segments 2 are arranged upwards.

Further, the fixing member 3 is provided with external threads corresponding to the plurality of threaded holes 131.

The present invention is not limited to the details and embodiments described herein, and thus additional advantages and modifications may readily be made by those skilled in the art, without departing from the spirit and scope of the general concepts defined in the claims and the equivalents thereof, and the invention is not limited to the specific details, representative apparatus and illustrative examples shown and described herein.

Claims

1. The composite anchoring slip is characterized by comprising a slip body (1), slip tooth blocks (2) and a fixing piece (3), wherein the slip tooth blocks (2) are embedded on the slip body (1), stepped anchoring teeth (21) are formed on the slip tooth blocks (2), the fixing piece (3) penetrates through the slip body (1) and the slip tooth blocks (2) to fix the slip body (1) and the slip tooth blocks (2), and the slip body (1) comprises a main body part (11) and a branch part (12) which is connected with the main body part (11) and is I-shaped; the section of the main body part (11) is triangular, an included angle of 60 degrees is formed on two side edges of the main body part (11), a slope is formed at one end, far away from the branch part (12), of the main body part (11), the upper end face of the slip tooth block (2) is an arc face, the upper end face of the slip tooth block (2) forms a stepped anchoring tooth (21), the slip tooth block (2) is embedded in the groove (13), the anchoring tooth (21) of the slip tooth block (2) is upwards arranged, an included angle theta is formed on the anchoring tooth (21), the included angle theta is 45 degrees, a plurality of counter bores (22) are formed in the slip tooth block (2), and the counter bores (22) are linearly distributed; the number of the fixing pieces (3) is a plurality, and the fixing pieces (3) correspondingly penetrate through the counter bores (22) and the threaded holes (131).

2. The composite anchoring slip according to claim 1, wherein the top surface of the slip body (1) is provided with a groove (13), the groove (13) is provided on the main body (11), and a plurality of threaded holes (131) are provided in the groove (13), and the plurality of threaded holes (131) are distributed in a straight line.

3. The composite anchoring slip according to claim 1, characterized in that the securing element (3) is provided with an external thread.

4. The composite anchoring slip according to claim 1, characterized in that the slip body (1) is made of an alloy steel material and the securing element (3) is a hexagon socket screw.