CN209799896U

CN209799896U - Ball centralizer

Info

Publication number: CN209799896U
Application number: CN201920138189.9U
Authority: CN
Inventors: 刘晓峰
Original assignee: Shijiazhuang Dibo Petroleum Machinery Equipment Co Ltd
Current assignee: Shandong Dibo Petroleum Machinery Co ltd
Priority date: 2019-01-26
Filing date: 2019-01-26
Publication date: 2019-12-17
Anticipated expiration: 2029-01-26

Abstract

The utility model relates to a ball centralizer, including the rib of centralizer body, equipartition on centralizer body outer wall, open recess on the rib and place the ball in the recess. The central line of the rib is a cylindrical spiral line. The rib is provided with a blind hole which is communicated with the groove, and the diameter of the blind hole is larger than the maximum width of the groove. The bottom surface of the blind hole is provided with a threaded hole, a bolt is arranged in the threaded hole, the head of the bolt is positioned in the blind hole, and the top surface of the head of the bolt is positioned below the top surface of the rib. Chamfers are arranged at two ends of the centralizer body. The side surfaces of the ribs, which are parallel to the two ends of the centralizer body, are inclined surfaces. The utility model discloses install on the sleeve pipe outer wall, at the sheathed tube in-process of installation, can play and keep the sleeve pipe placed in the middle of, make annular space cement ring distribute more even, reduce the effect that the sleeve pipe went into the well resistance and improved cement well cementation effect.

Description

Ball centralizer

Technical Field

The utility model belongs to the technical field of the technique of casing installation in the oil gas well and specifically relates to a ball centralizer is related to.

Background

The petroleum casing is a steel pipe used for supporting the wall of a well of an oil well or a gas well so as to ensure the normal operation of the whole oil well after the drilling process and the completion. Each well uses several layers of casing depending on the drilling depth and geological conditions. After the casing is put into the well, cement is adopted for cementing the well, and the casing is different from an oil pipe and a drill rod, cannot be reused and belongs to a disposable consumption material. Therefore, the consumption of the casing accounts for 70% or more of the total oil country tubular goods.

Casing can tilt during installation, and therefore centralizers are needed. The centralizer is installed on the lower end and the side wall of the casing and enters the pipe well along with the casing. As the transition between sleeve pipe and tube well, the centralizer can guarantee that the sleeve pipe is perpendicular, can also play the effect of enlarging the tube well internal diameter and finishing the tube well inner wall.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can improve displacement efficiency, improve well cementation quality ball centralizer.

The above object of the present invention can be achieved by the following technical solutions:

The utility model provides a ball centralizer, includes the centralizer body, the rib of equipartition on centralizer body outer wall, opens the recess on the rib and places the ball in the recess.

Through adopting above-mentioned technical scheme, the in-process that the sleeve pipe drove the centralizer and enters into the tube well, and the centralizer can right the sleeve pipe, makes annular space cement sheath's distribution more even. The ball extrudes the inner wall of the tube well in the process of rotating along with the sleeve, so that the inner wall of the tube well is smoother, the cementation quality of cement and a stratum is improved, the displacement efficiency is improved, and the sealing quality and the well cementation effect of the cement are ensured. Besides, the ball rotates along with the centralizer body, the ball also rotates, the advancing resistance is smaller, and the installation resistance of the sleeve can be further reduced.

The utility model discloses further set up to: the central line of the rib is a cylindrical spiral line.

By adopting the technical scheme, the spiral rib is more consistent with the motion track of the rib, and the motion resistance is lower.

The utility model discloses further set up to: blind holes are formed in the ribs; the blind hole is communicated with the groove;

The diameter of the blind hole is larger than the maximum width of the groove;

The bottom surface of the blind hole is provided with a threaded hole; a bolt is arranged in the threaded hole; the head of the bolt is positioned in the blind hole.

The utility model discloses further set up to: and chamfers are arranged at two ends of the centralizer body.

through adopting above-mentioned technical scheme, just can install the ball in the recess after unscrewing the bolt, this kind of structure simple manufacture, simple to operate.

The utility model discloses further set up to: the side surfaces of the ribs, which are parallel to the two ends of the centralizer body, are inclined planes.

through adopting above-mentioned technical scheme, the inclined plane can reduce the resistance of centralizer on the vertical direction.

The utility model discloses further set up to: the inclined side surface of the rib is intersected with one end surface of the centralizer body.

Through adopting above-mentioned technical scheme, when processing the terminal surface of centralizer, can process the slope side of rib simultaneously, the course of working is simpler, and the processing degree of difficulty is lower.

The utility model discloses further set up to: the top surface of the bolt head is positioned below the top surface of the rib.

Through adopting above-mentioned technical scheme, can avoid the bolt with the fish tail of tube-well inner wall.

To sum up, the utility model discloses a beneficial technological effect does:

1. The utility model discloses following the in-process that the sleeve pipe entered into the tube well, can right the sleeve pipe, make annular space cement ring's distribution more even. The ball extrudes the inner wall of the tube well in the process of rotating along with the sleeve, so that the inner wall of the tube well is smoother, the cementation quality of cement and a stratum is improved, the displacement efficiency is improved, and the sealing quality and the well cementation effect of the cement are ensured. Besides, the ball rotates along with the centralizer body, the ball also rotates, the advancing resistance is smaller, and the installation resistance of the sleeve can be further reduced.

2. the utility model discloses increased the blind hole in the one end of recess, place the ball during installation ball and promote in the blind hole, the ball just can move the recess in, and is blocked up the blind hole with screwing up the bolt at last. This kind of structure facilitates processing and installation, can reduce the utility model discloses a cost of manufacture and the assembly degree of difficulty.

drawings

Fig. 1 is a schematic perspective view of the present invention.

fig. 2 is a schematic cross-sectional view of the present invention.

In the figure, 11, a centralizer body; 12. a rib; 13. a groove; 14. a ball bearing; 21. blind holes; 22. a threaded hole; 23. a bolt; 3. and (6) chamfering.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the ball centralizer disclosed in the present invention, the centralizer body 11 is a circular tube, and is placed on a horizontal plane, and the projection in the horizontal direction is circular, and the projection in the vertical direction is rectangular.

a plurality of ribs 12 are uniformly distributed on the outer wall of the centralizer body 11, and the central lines of the ribs 12 are cylindrical spiral lines. From the mathematical point of view, the section of the rib 12 in the horizontal direction is rectangular or trapezoidal, a cylindrical spiral line exists on the outer wall of the centralizer body 11, the sections of numerous ribs 12 in the horizontal direction are located on the cylindrical spiral line, the bottom edge of each section is perpendicular to the central line of the centralizer body 11, and the body formed by the sections is the rib 12. The shape is similar to the structure of a DNA molecule.

Each rib 12 has a recess 13 and a blind hole 21 formed in the surface thereof, and a threaded hole 22 formed in the bottom surface of the blind hole 21, a bolt 23 being screwed into the threaded hole 22, and the head of the bolt 23 being located in the blind hole 21. A plurality of balls 14 are placed in the groove 13, and the diameter of the balls 14 is smaller than that of the blind hole 21. After the bolt 23 is unscrewed, the ball 14 is pushed into the blind hole 21 and can be directly taken out. The centerline of the rib 12 is also a cylindrical helix, similar to the centerline of the rib 12.

Both ends of the centralizer body 11 are respectively processed with a chamfer 3, both ends of the rib 12 are also processed into inclined planes, and the inclined side surface of one of the chamfer 3 and the rib 12 is positioned in the same plane.

The implementation principle of the embodiment is as follows:

The utility model discloses a specification is selected according to sheathed tube diameter, guarantees the cover that can be smooth on the sleeve pipe. The number on each casing is selected according to the length of the casing, the actual conditions within the well and the stress of the casing. After the installation is completed, the casing is driven into the well.

The centralizer body 1 rotates and moves downwards along with the casing in the well. During the downward movement, the balls 14 contact the inner wall of the well. In the rotation process, the ball 14 extrudes the inner wall of the tube well, so that the inner wall of the tube well can be expanded and smoother on the one hand. These two processes are performed simultaneously and are stopped when the sleeve is lowered to a predetermined position.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A ball centralizer, characterized by: comprises a centralizer body (11), ribs (12) uniformly distributed on the outer wall of the centralizer body (11), grooves (13) formed on the ribs (12) and balls (14) placed in the grooves (13).

2. a ball centralizer according to claim 1, wherein: the central line of the rib (12) is a cylindrical spiral line.

3. A ball centralizer according to claim 1, wherein: blind holes (21) are formed in the ribs (12); the blind hole (21) is communicated with the groove (13);

The diameter of the blind hole (21) is larger than the maximum width of the groove (13);

A threaded hole (22) is formed in the bottom surface of the blind hole (21); a bolt (23) is arranged in the threaded hole (22); the head of the bolt (23) is positioned in the blind hole (21).

4. A ball centralizer according to claim 1, wherein: chamfers (3) are arranged at two ends of the centralizer body (11).

5. A ball centralizer according to claim 1, wherein: the side surfaces of the ribs (12) parallel to the two ends of the centralizer body (11) are inclined surfaces.

6. The ball centralizer of claim 5, wherein: the inclined side surface of the rib (12) is intersected with one end surface of the centralizer body (11).

7. A ball centralizer according to claim 3, wherein: the top surface of the head of the bolt (23) is positioned below the top surface of the rib (12).