Controllable dissolvable well cementation rubber plug

Abstract

The invention provides a controllable dissolvable well cementation rubber plug. The controllable dissolvable well cementation rubber plug comprises a core shaft, a sealing core body, a locking cap, aliquid cylinder, a rubber barrel, a rubber cup, a sealing body and a dissolvable core body, wherein the core shaft is of a hollow barrel-shaped structure; the sealing core body is arranged in one endof the core shaft; the sealing body sleeves the outer side of the other end of the core shaft; a cavity is formed between the inner part of the sealing body and the end part of the core shaft; the dissolvable core body is arranged in the cavity; the rubber cup, the rubber barrel, the liquid cylinder and the locking cap sleeve in sequence from the outer side of the core shaft at one end of the sealing body to the outer side of the other end of the core shaft. According to the controllable dissolvable well cementation rubber plug provided by the invention, well cementation can be finished; aftera sleeve is subjected to a pressure test, the dissolvable core body is dissolved and a channel between a shaft and a stratum is established, so that perforation operation is avoided.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a controllable dissolution cementing rubber plug. Background technique [0002] Cementing operation is one of the most important links in oil and gas drilling engineering, relying on cementing plugs to realize the isolation of cement slurry and mud. After the cementing is completed, the position of the cementing plug is the artificial well bottom. To carry out oil and gas production or reconstruction, a special perforating tool string must be lowered for perforating operations to realize formation communication. Lowering the perforating tool for perforating operations requires a long construction period and high costs, especially in horizontal wells, where construction is difficult and risky. [0003] In recent years, in order to solve the problem of perforation, a lot of research has also been carried out. There are two kinds of casing sliding sleeves in t...

AI Technical Summary

Problems solved by technology

Lowering the perforating tool for perforating operations requires a long construction period and high costs, especially in horizontal wells, where construction is difficult and risky

[0003] In recent years, in order to solve the problem of perforation, a lot of research has also been carried out. There are two kinds of casing sliding sleeves in the prior art. These two special casing tools are connected with the casing and run in with the casing In the wellbore, after the cementing is completed, the sliding sleeve is opened by the pressure in the wellbore, and the communication channel between the wellbore and the formation is established, but the tool structure is complex, the construction process is cumbersome, and the cost is high

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