CN209799894U

CN209799894U - Rigid welding centralizer

Info

Publication number: CN209799894U
Application number: CN201920137861.2U
Authority: CN
Inventors: 刘晓峰
Original assignee: Shijiazhuang Dibo Petroleum Machinery Equipment Co Ltd
Current assignee: Shandong Gutewei 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 rigid welding centralizer, including pipe and the rib of welding on the pipe outer wall, the rib slope sets up and centers on the circular array of central line of pipe. The side surfaces of the ribs are inclined planes. The central line of the rib is a cylindrical spiral line. The surfaces of the round tube and the rib are both sprayed with antirust paint. The top surfaces of the ribs are provided with bulges which are vertical to the central line of the circular tube. The upper end and the lower end of the circular tube are both provided with chamfers, and one pair of opposite side surfaces of the rib is parallel to the adjacent chamfers and is positioned in the same plane. The utility model discloses a section bar welding forms, and the course of working is simple, and the cost of manufacture is low for the installation sleeve pipe has the effect of rightting sleeve pipe, reaming, making the pipe shaft inner wall more smooth and get rid of the mud cake on the pipe shaft inner wall.

Description

rigid welding centralizer

Technical Field

The utility model belongs to the technical field of the technique of oil gas tubular well-drilling in-process sleeve pipe rightting and specifically relates to a rigid welding 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 simple structure makes easy rigid welding centralizer.

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

A rigid welding centralizer comprises a circular tube and ribs welded on the outer wall of the circular tube;

The ribs are in a circular array around the center line of the circular tube; the ribs are obliquely arranged.

through adopting the technical scheme, the utility model discloses with rib beading direct welding on the pipe outer wall, pipe and rib all can adopt the section bar preparation like this, draw materials easier, the preparation is got up easier, the cost of manufacture is also lower. The inclined ribs can reduce the resistance of the sleeve in the advancing process, so that the installation process is smoother.

The utility model discloses further set up to: a pair of opposite sides of the rib is an inclined plane.

Through adopting above-mentioned technical scheme, following the sleeve pipe pivoted in-process, this group side can reduce the sleeve pipe at the ascending resistance of level or vertical direction, makes the installation more smooth and easy.

The utility model discloses further set up to: the side surfaces of the ribs are inclined planes.

By adopting the technical scheme, the resistance of the sleeve in the horizontal or vertical direction is reduced in the installation process.

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

Through adopting above-mentioned technical scheme, the rib is the spiral in the shape on the surface of pipe, this shape with the utility model discloses a movement track is more identical, can further reduce the resistance of sleeve pipe in the installation.

The utility model discloses further set up to: and the surfaces of the round pipe and the rib are both sprayed with antirust paint.

Through adopting above-mentioned technical scheme, water and oxygen in the pipe shaft can be completely cut off to the anti-rust paint, avoids pipe and rib to rust after placing or getting into the pipe shaft.

The utility model discloses further set up to: the top surface of the rib is provided with a bulge;

The bulges are perpendicular to the central line of the circular tube.

Through adopting above-mentioned technical scheme, the arch can be to the inner wall of tube well extrusion, realizes reaming, gets rid of the mud cake and makes the effect of tube well inner wall more smooth.

the utility model discloses further set up to: the upper end and the lower end of the round pipe are both provided with chamfers.

Through adopting above-mentioned technical scheme, the chamfer can reduce the resistance of sleeve pipe in the vertical direction.

the utility model discloses further set up to: one pair of opposite side surfaces of the rib is respectively parallel to the adjacent chamfers and is positioned in the same plane.

By adopting the technical scheme, during processing, the corresponding inclined planes on the chamfer and the rib can be processed together, the processing can be shortened, and the deformation problem during re-welding after the rib processing is finished is avoided.

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

1. The utility model discloses a section bar preparation, material source is extensive, and purchasing cost is low. The circular tube and the rib are directly connected in a welding mode, and the manufacturing is convenient. Can obviously reduce the manufacturing cost and improve the competitiveness of the product in the market.

2. the utility model discloses the shape of well rib is the spiral, and this shape accords with its motion trail in the tube well more, can reduce the resistance that the sleeve pipe received in the installation, makes more smooth and easy in its installation.

Drawings

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

Fig. 2 is a plan view of the present invention.

In the figure, 11, a circular tube; 12. a rib; 2. a protrusion; 3. and (6) chamfering.

Detailed Description

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

For clarity of description, the casing 11 is placed on a horizontal plane with its centerline perpendicular to the horizontal plane. The projection of the sleeve 11 in the horizontal direction is a circular ring, and the projection in the vertical direction is a rectangle.

Referring to fig. 1 and 2, for the utility model discloses a, sleeve pipe 11 is formed by the cutting of seamless steel pipe, and rib 12 mills after cutting by the thick plate and makes, welds on sleeve pipe 11's outer wall after the heating is crooked, and welding quantity is generally four.

The surface of the rib 12 contacting the sleeve 11 is a bottom surface, the surface opposite to the bottom surface is a top surface, and the rest surfaces are side surfaces. The sides of the rib 12 are beveled, i.e., each side of the rib 12 is not perpendicular to its bottom or top surface.

A point moves linearly at a constant speed on the outer surface of the sleeve 11 and rotates at a constant speed around the center line of the sleeve 11, and the motion track formed by the point is a cylindrical spiral line. The center line of the rib 12 is a cylindrical helix, which is further explained as: one section of the rib 12 moves on the outer surface of the sleeve 11 according to a prescribed cylindrical spiral line, and the body formed by the countless sections during the movement is the shape of the rib 12, which is more consistent with the movement track of the rib in the well.

The two ends of the round tube 11 are processed with chamfers, the inclination angle of one group of side faces of the ribs 12 is the same as the chamfer angle, and the chamfer angle are in the same plane.

The rib 12 is provided on its upper surface with a projection 2 perpendicular to the center line of the sleeve 11. The surfaces of the sleeve 11 and the rib 12 are sprayed with antirust paint.

The implementation principle of the embodiment is as follows:

Will the utility model discloses the cover is on sheathed tube outer wall, and both ends are fixed with the retaining ring. In the installation process, the utility model discloses follow the sleeve pipe and rotate and enter the pipe well in.

in the entering process, the bulges 2 on the ribs 12 can continuously extrude the inner wall of the pipe well, so that the inner diameter of the pipe well is increased. In the extrusion process, mud cakes on the inner wall of the pipe well fall off and are smoother. In the process, mud cakes, drilling fluid and the like in the pipe well exert pressure on the inclined surface of the chamfer 3 and the inclined side surface of the rib 12, part of the pressure is converted into pressure perpendicular to the movement direction of the casing and is counteracted with the pressure, and the casing is subjected to smaller resistance. The sleeve pipe stops rotating after taking place, the utility model discloses bury underground along with it.

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 rigid welding centralizer characterized in that: comprises a circular tube (11) and ribs (12) welded on the outer wall of the circular tube (11);

The ribs (12) are in a circular array around the center line of the circular tube (11);

The ribs (12) are arranged obliquely.

2. A rigid welding centralizer according to claim 1, wherein: a pair of opposite side surfaces of the rib (12) are inclined surfaces.

3. A rigid welding centralizer according to claim 2, wherein: the side surfaces of the ribs (12) are all inclined surfaces.

4. A rigid welding centralizer according to any of claims 1 to 3, wherein: the central line of the rib (12) is a cylindrical spiral line.

5. A rigid welding centralizer according to claim 1, wherein: and antirust paint is sprayed on the surfaces of the round pipe (11) and the rib (12).

6. a rigid welding centralizer according to claim 1, wherein: the top surfaces of the ribs (12) are provided with bulges (2);

The bulges (2) are vertical to the central line of the circular tube (11).

7. A rigid welding centralizer according to claim 2, wherein: the upper end and the lower end of the round pipe (11) are both provided with chamfers (3).

8. A rigid welding centralizer according to claim 7, wherein: one pair of opposite side surfaces of the rib (12) are respectively parallel to the adjacent chamfers (3) and are positioned in the same plane.