CN210599841U - Sliding thrust bearing for downhole speed-up tool - Google Patents

Abstract

The utility model discloses a sliding thrust bearing for an underground speed-up tool, which comprises a bearing matrix and a PDC composite sheet (3), wherein the PDC composite sheet (3) is provided with a working surface, and the bearing matrix comprises a bearing sleeve (1) and an annular bearing seat (2); the upper end surface of the bearing sleeve (1) is provided with an annular edge; the annular edge is provided with round holes (11) distributed along the circumferential direction; the depth of the circular hole (11) is smaller than the height of the PDC composite sheet (3); fixing the PDC compacts (3) in the circular holes (11) in a mode that the working surfaces of all the PDC compacts (3) are on the same plane; the bearing sleeve (1) is connected with the bearing seat (2); the upper end surface of the bearing seat (2) is attached to the opposite surface of the working surface of the PDC composite sheet (3) in the round hole (11); the problem of current sliding thrust bearing's working face is uneven is solved.

Description

Sliding thrust bearing for downhole speed-up tool

Technical Field

The utility model relates to a sliding thrust bearing that is arranged in the speed-up instrument in pit in the well drilling.

Background

A sliding thrust bearing in the conventional downhole acceleration tool consists of a circular ring-shaped bearing substrate and PDC (polycrystalline diamond compact) composite sheets, wherein circular grooves are uniformly distributed along the circumferential direction of a circular ring on the bearing substrate, the depths of the circular grooves are the same, and the PDC composite sheets are embedded or welded in the circular grooves and then are exposed to the height of about 1-2 mm; the plane of the upper surfaces of all the PDC composite sheets is a working surface.

The PDC composite sheet is in the process of being inlaid or welded in each circular groove, due to the technical limitation of inlaying or welding or the slight difference of the height of the PDC composite sheet, the working surface of the processed thrust bearing is difficult to guarantee on a plane, and the phenomenon of the PDC composite sheet is easy to occur, so that the service life and the use effect of the sliding thrust bearing are influenced.

Disclosure of Invention

In view of this, the utility model provides two kinds of sliding thrust bearings that are used for speed-up instrument in the pit has solved the uneven problem of working face of current sliding thrust bearing.

In a first aspect, the sliding thrust bearing for a downhole acceleration tool comprises: bearing matrix and PDC compound piece, the compound piece of PDC has working face, its characterized in that:

the bearing base body includes: a bearing sleeve and an annular bearing seat;

the upper end surface of the bearing sleeve is provided with an annular edge;

the annular edge is provided with round holes distributed along the circumferential direction of the annular edge;

the depth of the circular hole is smaller than the height of the PDC composite sheet;

fixing the PDC composite sheets in the round holes in a mode that the working surfaces of all the PDC composite sheets are on the same plane;

the bearing sleeve is connected with the bearing seat;

the upper end surface of the bearing seat is attached to the opposite surface of the working surface of the PDC composite sheet in the round hole.

In a second aspect, a sliding thrust bearing for a downhole acceleration tool, comprising: bearing matrix and PDC compound piece, the compound piece of PDC has working face, its characterized in that:

the bearing base body includes: a bearing sleeve and an annular bearing seat;

the bearing sleeve is provided with round holes distributed along the circumferential direction of the bearing sleeve;

the depth of the circular hole is greater than the height of the PDC composite sheet;

fixing the PDC composite sheets in the round holes in a mode that the working surfaces of all the PDC composite sheets are on the same plane;

the upper end surface of the annular bearing seat is provided with circular pile structures distributed along the circumferential direction of the annular bearing seat;

the round pile structures are correspondingly inserted into the round holes one by one;

the upper end face of the round pile structure is attached to the opposite face of the working face of the PDC composite sheet in the round hole.

Preferably, the circular holes are evenly distributed along the circumferential direction.

Preferably, the PDC composite sheet is fixed to the circular hole by means of inlaying or welding.

Preferably, the bearing seat is connected with the bearing sleeve in an interference fit and/or welding mode.

Preferably, the insertion adopts an interference fit and/or a welding mode.

The utility model discloses following beneficial effect has:

the utility model discloses a sliding thrust bearing for speed-up instrument in pit decomposes the bearing base member of original sliding thrust bearing into bearing housing and bearing frame to it has the round hole to open on the bearing housing, replaces original circular slot structure, can ensure at first when fixed PDC composite sheet like this that all PDC composite sheet's working face is on a plane, then laminate through the opposite side of bearing frame and the working face of the PDC composite sheet in the round hole on the opposite side of unimportant working face; meanwhile, in order to meet the assembly requirement of the bearing, the opposite surface of the working surface of the PDC composite sheet or the upper end surface of the round pile arranged on the bearing seat is a non-working surface, so that certain grinding or heightening operation can be carried out on the surfaces; by the design, the use effect of the sliding thrust bearing is ensured on the premise of not reducing the service life of the bearing and meeting the assembly requirement.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a sliding thrust bearing for a downhole acceleration tool in accordance with a first embodiment of the present invention;

fig. 2 is a schematic structural view of a bearing housing according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a sliding thrust bearing for a downhole acceleration tool in accordance with a second embodiment of the present invention;

fig. 4 is a schematic structural view of an annular bearing seat according to a second embodiment of the present invention.

Detailed Description

The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for parts not described in detail, those skilled in the art can fully understand the present invention.

Furthermore, those skilled in the art will appreciate that the drawings are provided for purposes of illustrating the objects, features, and advantages of the invention and are not necessarily drawn to scale.

Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".

Example one

FIG. 1 is a schematic structural view of a sliding thrust bearing for a downhole tool according to a first embodiment of the present invention; fig. 2 is a schematic structural view of a bearing housing according to an embodiment of the present invention; as shown in fig. 1 and 2, a sliding thrust bearing for a downhole acceleration tool comprises a bearing substrate and a PDC composite sheet 3, wherein the PDC composite sheet 3 has a working surface, and the bearing substrate comprises: a bearing sleeve 1 and an annular bearing seat 2; the up end of bearing housing 1 has annular border, and it has along its circumference distributed's round hole 11 to open on this annular border, and the degree of depth of round hole 11 is less than the height of compound piece 3 of PDC.

Fixing the PDC composite sheets 3 in the circular holes 11 in a manner that the working surfaces of all the PDC composite sheets 3 are on the same plane; the bearing sleeve 1 is connected with a bearing seat 2; the upper end surface of the bearing seat 2 is attached to the opposite surface of the working surface of the PDC composite sheet 3 in the circular hole 11.

In fig. 2, circular holes 11 formed in the bearing sleeve 1 are uniformly distributed in the circumferential direction.

In fig. 1, the PDC composite sheet 3 is fixed to the circular hole 11 by insert welding. The bearing seat 2 is fixedly connected with the bearing sleeve 1 in an interference fit and/or welding mode.

Example two

FIG. 3 is a cross-sectional view of a sliding thrust bearing for a downhole acceleration tool in accordance with a second embodiment of the present invention; fig. 4 is a schematic structural view of an annular bearing seat according to a second embodiment of the present invention. In fig. 3, a sliding thrust bearing for a downhole acceleration tool comprises a bearing substrate and a PDC composite sheet 3, wherein the PDC composite sheet 3 has a working surface, and the bearing substrate comprises a bearing sleeve 1 and an annular bearing seat 2; the bearing sleeve 1 is provided with round holes 11 distributed along the circumferential direction, and the depth of the round holes 11 is greater than the height of the PDC composite sheet 3.

Fixing the PDC composite sheets in the circular hole 11 in a manner that the working surfaces of all the PDC composite sheets are on the same plane; in fig. 4, the upper end surface of the annular bearing seat 2 has circular pile structures 31 distributed along the circumferential direction thereof, the circular pile structures 31 are inserted into the circular holes 11 in a one-to-one correspondence manner, and the upper end surface of the circular pile structure 31 is attached to the opposite surface of the working surface of the PDC composite sheet 3 in the circular hole 11.

The round pile structure 31 can be inserted into the round hole 11 by interference fit and/or welding.

Specifically, the assembly process of the sliding thrust bearing for an downhole acceleration tool of the present invention is described with reference to the accompanying drawings:

1. all the PDC composite sheets 3 are fixed in the round holes 11 of the bearing sleeve 1 in a welding mode in a mode that the working surfaces of all the PDC composite sheets 3 are on the same plane.

2. If the bearing seat 2 is a separate structure as shown in the first embodiment, in order to ensure the working effect of the thrust bearing, the back surfaces of the working surfaces of the thrust bearing (i.e., the plane formed by the lower end surface of the bearing sleeve 1 and the lower end surface of the bearing seat 2 after the bearing sleeve 1 and the bearing seat 2 are connected) need to be on the same plane.

If the welding mode or the height difference of the PDC composite sheets 3 is adopted, in the assembling process, the depth of the circular hole 11 is smaller than the height of the PDC composite sheets 3, so that the situation that the upper end surface of the bearing seat 2 and the opposite surface of the working surface of the PDC composite sheets 3 in the circular hole 11 cannot be completely attached occurs.

At this point, the opposite face of the working face of the PDC compact 3 may be ground to reduce its height or increased in a known manner until assembly requirements are met.

3. If the bearing seat 2 is an integral structure as shown in the second embodiment, due to the welding manner or the height difference of the PDC composite sheets 3, the depth of the circular hole 11 is greater than the height of the PDC composite sheets 3 during the assembly process, which may cause the upper end surface of the circular pile structure of the individual bearing seat 2 and the opposite surface of the working surface of the PDC composite sheets 3 in the circular hole 11 not to be completely attached to each other.

At this point, the upper end face of the round pile structure of the bearing housing 2 may be ground to reduce its height or increased in a known manner until the assembly requirements are met.

The above-mentioned embodiments are merely embodiments for expressing the invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions, modifications, etc. can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (8)

1. A sliding thrust bearing for a downhole acceleration tool, comprising: bearing substrate and PDC compound piece (3), PDC compound piece (3) have working face, its characterized in that:

the bearing base body includes: a bearing sleeve (1) and an annular bearing seat (2);

the upper end surface of the bearing sleeve (1) is provided with an annular edge;

the annular edge is provided with round holes (11) distributed along the circumferential direction;

the depth of the circular hole (11) is smaller than the height of the PDC composite sheet (3);

fixing the PDC compacts (3) in the circular holes (11) in a mode that the working surfaces of all the PDC compacts (3) are on the same plane;

the bearing sleeve (1) is connected with the bearing seat (2);

the upper end surface of the bearing seat (2) is attached to the opposite surface of the working surface of the PDC composite sheet (3) in the round hole (11).

2. A sliding thrust bearing for a downhole acceleration tool according to claim 1, characterized in that:

the round holes (11) are uniformly distributed along the circumferential direction.

3. A sliding thrust bearing for a downhole acceleration tool according to claim 1, characterized in that:

the PDC composite sheet (3) is fixed with the round hole (11) in an embedding or welding mode.

4. A sliding thrust bearing for a downhole acceleration tool according to claim 1, characterized in that:

the bearing seat (2) is connected with the bearing sleeve (1) in an interference fit and/or welding mode.

5. A sliding thrust bearing for a downhole acceleration tool, comprising: bearing substrate and PDC compound piece (3), PDC compound piece (3) have working face, its characterized in that:

the bearing base body includes: a bearing sleeve (1) and an annular bearing seat (2);

round holes (11) distributed along the circumferential direction of the bearing sleeve (1) are formed in the bearing sleeve;

the depth of the circular hole (11) is greater than the height of the PDC composite sheet (3);

fixing the PDC compacts (3) in the circular holes (11) in a mode that the working surfaces of all the PDC compacts (3) are on the same plane;

the upper end surface of the annular bearing seat (2) is provided with circular pile structures (31) distributed along the circumferential direction of the annular bearing seat;

the round pile structures (31) are correspondingly inserted into the round holes (11) one by one;

the upper end face of the round pile structure (31) is attached to the opposite face of the working face of the PDC composite sheet (3) in the round hole (11).

6. A sliding thrust bearing for a downhole acceleration tool according to claim 5, characterized in that:

the insertion adopts an interference fit and/or welding mode.

7. A sliding thrust bearing for a downhole acceleration tool according to claim 5, characterized in that:

the round holes (11) are uniformly distributed along the circumferential direction.

8. A sliding thrust bearing for a downhole acceleration tool according to claim 5, characterized in that:

the PDC composite sheet (3) is fixed with the round hole (11) in an embedding or welding mode.

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