Reciprocating circulation blind device

Abstract

The invention relates to the technical field of blind plate devices adopted for oil and gas field exploitation, in particular to a reciprocating circular blind plate device. The reciprocating circular blind plate device comprises a base, a body and a sliding blind plate, wherein the base is of an annular structure, an inner cavity in the left part of the base is a horn cavity becoming smaller from left to right, an annular installing groove is formed in the right end of the base, and the outer wall of the right part of the base and the inner wall of the right part of the body are fixedly installed together; the sliding blind plate comprises an installing head and a working plate, the left part of the installing head is shaped like an annular frustum matched with the horn cavity, the right part of the installing head is matched with the inner cavity of the base, and an axial through hole is formed in the middle of the working plate. The blind plate device is reasonable and compact in structure and convenient to use, the blind plate device is equivalent to a non-circular blind plate under normal conditions, when casing running meets resistance and circulation needs to be set up, a new circulating channel can be set up for well flushing through reverse pressure build-up, blockage is eliminated, and the risk of well cementing and completion is reduced; the base and the sliding blind plate can be drilled away easily, and the blind plate device can be widely applied to various occasions.

Description

technical field [0001] The invention relates to the technical field of blind plate devices used in oil and gas field development, and is a reciprocating circulating blind plate device. Background technique [0002] Blind plate is a common cementing and completion tool in oil and gas field exploitation. Non-circulating blind plate is widely used in deep wells, medium-deep wells or complex wells due to its high strength and good sealing performance, but non-circulating blind plate enters well. Later, when the pipe string runs into the well condition such as resistance, the circulation cannot be established, which may easily lead to accidents such as casing pulling. SUMMARY OF THE INVENTION [0003] The invention provides a reciprocating circulating blind plate device, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem that circulation cannot be established in the current non-circulating blind plate when the pipe string enc...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a reciprocating circulation blind plate device, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the current non-circulatory blind plate exists under the pipe string. The problem that circulation cannot be established when entering well conditions such as resistance

Images