CN117738623B

CN117738623B - Combined round hole sand-proof screen pipe

Info

Publication number: CN117738623B
Application number: CN202410182144.7A
Authority: CN
Inventors: 陈静; 高福万; 杨贺来
Original assignee: TIANJIN ZHONGJIE TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: TIANJIN ZHONGJIE TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2024-02-19
Filing date: 2024-02-19
Publication date: 2024-05-14
Anticipated expiration: 2044-02-19
Also published as: CN117738623A

Abstract

The invention discloses a combined round hole sand control screen pipe, which consists of a coupling and a pipe body. External threads are machined at two ends of the pipe body, one end of the external threads is in threaded connection with the coupling, a plurality of round holes in combined shapes are machined in the pipe wall of the pipe body, each round hole consists of an outer short cylindrical hole and an inner large truncated conical hole, the aperture close to the outer surface of the pipe body is small, the aperture close to the inner surface of the pipe body is large, and the pipe body is in a diffusion shape from the outside to the inside. The contact part of the outer short cylindrical hole and the outer surface of the pipe body forms a sharp edge chamfer angle, the aperture of the outer short cylindrical hole is more than or equal to 0.05mm, and the conical angle of the inner large truncated conical hole close to the inner surface of the pipe body is 6-30 degrees. The arrangement mode of the round holes in the combined shape on the pipe body is parallel arrangement, staggered arrangement or spiral arrangement. Compared with a slotted screen pipe, the invention has the advantages that the fatigue strength of the pipe body is improved and the service life of the screen pipe is prolonged under the condition of the same overflow area ratio.

Description

Combined round hole sand-proof screen pipe

Technical Field

The invention relates to a sand control screen pipe with combined round holes, and belongs to the technical field of petroleum tool manufacturing.

Background

The existing mechanical sand control screen pipe for well completion mainly comprises a slotted screen pipe, wherein the slotted screen pipe is formed by processing a plurality of macroscopic cracks on a pipe body, and the slotted screen pipe is a technical means which is conventional in the technical field. Because of the abrupt change of the cross section geometry of the slotted screen body, the local stress of the slotted screen body is far greater than the nominal stress of the pipe body, namely the stress concentration becomes the root cause of fatigue fracture of the pipe body. In addition, because the conical sieve tube with the aperture size (0.05-0.20) is difficult to process by a certain method, the invention and the application of the conical sieve tube with the aperture size (0.05-0.20) or the combined round hole sand control sieve tube are not available in the field at home and abroad at present.

Disclosure of Invention

In order to overcome the defects of the prior method, the invention provides a combined round hole sand control screen, which is characterized in that: the combined round hole sand control screen pipe consists of a pipe body and a coupling, wherein external threads are formed at two ends of the pipe body, one end of the pipe body is in threaded connection with the coupling, a plurality of combined round holes are formed in the pipe wall of the pipe body, each round hole consists of an outer short cylindrical hole and an inner large truncated conical hole, the aperture close to the outer surface of the pipe body is small, the aperture close to the inner surface of the pipe body is large, and the pipe body is in a diffusion shape from the outside to the inside; the contact part of the outer short cylindrical hole and the outer surface of the pipe body forms a sharp edge chamfer angle, the aperture of the outer short cylindrical hole is more than or equal to 0.05mm, and the conical angle of the inner large truncated conical hole close to the inner surface of the pipe body is 6-30 degrees.

The arrangement mode of the round holes in the combined shape on the pipe body (2) is parallel arrangement, staggered arrangement or spiral arrangement.

The invention has the beneficial effects that compared with the slotted screen pipe, the strength of the pipe is weakened to a low degree under the condition of the same overflow area ratio. Chamfering the sharp edges of the contact parts of the outer short cylindrical holes and the outer surface of the pipe body so as to prevent the abrupt change of the geometric shape of the section close to the pipe body and reduce the local stress of the seam; the short cylindrical holes are arranged to prevent sand abrasion, resulting in reduced sand filtering accuracy; the taper angle of the inner large truncated conical hole close to the inner surface of the pipe body is 6-30 degrees, so that liquid flow easily enters the pipe, and the gap has good self-cleaning property and prevents sand from being blocked.

The invention aims to overcome the defects that the stress concentration of the slit sieve tube gap is high and the fatigue fracture of the tube body is easy to occur. In terms of structural conception, the structure is not a simple combination of a plurality of slits, but breaks through a conventional slit structure and is changed into a combination of round holes with a plurality of shapes. The novel screen pipe has the beneficial technical effects of improving the fatigue strength of the pipe body, prolonging the service life of the screen pipe and the like.

The combined round hole sieve tube with the aperture size (0.05-0.20) mm can be manufactured by comprehensively using laser and plastic forming methods, and is referred to as a step slotted sieve tube follow-up forming machine tool (ZL 202010452664.7).

Drawings

FIG. 1 is a screen overall construction in which the composite shaped circular holes are aligned in parallel on the tubular body 2;

FIG. 2 is a staggered arrangement of round holes of a combined shape on the tube body 2;

FIG. 3 is a spiral arrangement of round holes of a combined shape on the tube body 2;

figure 4 shows that the round hole seen in the cross section of the pipe body 2 consists of an outer short cylindrical hole and an inner large truncated conical hole.

Reference numerals: 1. and 2, coupling and 2, a pipe body.

Detailed Description

The invention will be further described with reference to fig. 1 to 4 and examples.

As can be seen from fig. 1 to fig. 4, the combined round hole sand control screen pipe is formed by processing a combined round hole sand control screen pipe on a pipe body 2, wherein the combined round hole sand control screen pipe is composed of the pipe body 2 and a coupling 1, external threads are processed at two ends of the pipe body 2, one end of the external threads is in threaded connection with the coupling 1, a plurality of combined round holes are processed on the pipe wall of the pipe body 2, each round hole is composed of an external short cylindrical hole and an internal large truncated conical hole, the aperture close to the outer surface of the pipe body 2 is small, the aperture close to the inner surface of the pipe body 2 is large, and the pipe is in a diffusion shape from the outside to the inside of the pipe; the contact part of the outer short cylindrical hole and the outer surface of the pipe body 2 forms a sharp edge chamfer, and the aperture of the outer short cylindrical hole is more than or equal to 0.05mm in order to prevent the abrupt change of the geometric shape of the section close to the pipe body 2 and reduce the local stress of the seam; the diameter of the outer short cylinder is more than or equal to 0.05mm, and the length of the outer short cylinder is shorter, so as to prevent sand abrasion and reduce sand filtering precision. The cone angle of the inner large truncated conical hole close to the inner surface of the pipe body 2 is 6-30 degrees, so that liquid flow easily enters the pipe, and the gap has good self-cleaning property and prevents sand from being blocked. The round hole with the combined shape can be formed by comprehensively utilizing laser and a plastic forming method;

the arrangement mode of the round holes in the combined shape on the pipe body 2 is parallel arrangement, staggered arrangement or spiral arrangement.

Claims

1. A combination shape round hole sand control screen pipe, its characterized in that: the combined round hole sand control screen consists of a pipe body (2) and a coupling (1), wherein external threads are formed at two ends of the pipe body (2), one end of the external threads is in threaded connection with the coupling, a plurality of combined round holes are formed in the pipe wall of the pipe body (2), each round hole consists of an outer short cylindrical hole and an inner large truncated conical hole, the aperture close to the outer surface of the pipe body (2) is small, the aperture close to the inner surface of the pipe body (2) is large, and the pipe is in a diffusion shape from the outside of the pipe to the inside of the pipe; the contact part of the outer short cylindrical hole and the outer surface of the pipe body (2) forms a sharp edge chamfer, the aperture of the outer short cylindrical hole is more than or equal to 0.05mm, and the conical angle of the inner large truncated conical hole close to the inner surface of the pipe body (2) is 6-30 degrees.

2. The combination round hole sand control screen as defined in claim 1, wherein: the arrangement mode of the round holes in the combined shape on the pipe body (2) is parallel arrangement, staggered arrangement or spiral arrangement.