Well cementation rubber plug for slim holes

Abstract

The invention relates to a well cementation rubber plug for slim holes. The well cementation rubber plug comprises a body. The body is of a hollow tubular structure, an upper pressing groove, a middlepressing groove and a lower pressing groove are integrally formed in the outer wall of the body in sequence, and an upper rubber plug set and a lower rubber plug set are fixedly arranged between theupper pressing groove and the middle pressing groove and between the middle pressing groove and the lower pressing groove respectively. A retaining clamp spring and an annular sealing ring are fixedlyarranged on the outer wall of the body on the side of the lower pressing groove, a rupture valve is fixedly arranged on the inner wall of the body, and a sealing ring is installed between the retaining clamp spring and the end of the side of the lower pressing groove of the body. According to the rubber plug, not only the displacement amount can be calculated, but also the sealing performance ofa well entering tubular column can be verified, and the technical problem existing in well cementation of 88.9 mm oil tubes of the slim holes is solved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas cementing tools, in particular to a cementing rubber plug for slim holes. Background technique [0002] At present, the commonly used cementing plugs cannot meet the needs of slim hole 88.9mm tubing cementing, and the cementing slurry with 88.9mm tubing cementing will have a high return height at one time. If the displacement amount cannot be accurately controlled, it will lead to over-substitution or empty projects. Accidents, once such engineering accidents occur, the existing technology cannot save the accident loss. In addition, the wells cemented with 88.9mm tubing usually need to be fractured in the later stage, so the sealing test of the pipe string is required, which cannot be achieved by conventional cementing plugs. [0003] Therefore, based on these problems, it is of great practical significance to provide a slimhole cementing plug that can not only calculate the displacement amou...

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used cementing plugs cannot meet the needs of slim hole 88.9mm tubing cementing, and the cementing slurry with 88.9mm tubing cementing will have a high return height at one time. If the displacement amount cannot be accurately controlled, it will lead to over-substitution or empty projects. Accidents, once such engineering accidents occur, the existing technology cannot save the accident loss

In addition, the wells cemented with 88.9mm tubing usually need to be fractured in the later stage, so the sealing test of the pipe string is required, and the conventional cementing plug cannot realize this function

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