Tail pipe rubber plug device for clearing cement slurry in lower sleeve of drilling liner cementing choke ring

Abstract

The invention relates to the technical field of tail pipe rubber plug devices and particularly relates to a tail pipe rubber plug device for clearing cement slurry in a lower sleeve of a drilling liner cementing choke ring. The tail pipe rubber plug device comprises a rubber plug central spindle, a connector, a short connector, a sliding sleeve, a rubber wing pressing cap, a self-locking ring anda locking ring pressing cap, wherein at least two rubber plugs are sleeved on the outer wall of the rubber plug central spindle in turn from top to bottom; each rubber plug comprises a rubber plug ring and an annular rubber plug wing; the rubber plug wing is fixed on the outer wall of the rubber plug ring; in two adjacent rubber plug rings, a rubber plug pressing ring is arranged on the lower outer wall of the rubber plug ring above and the upper outer wall of the rubber plug ring below; a rubber plug upper inner ring slot is formed in the lower inner wall of the connection head. The device provided by the invention has the advantages of reasonable and compact structure and convenience in use, and can effectively clear cement slurry in a sleeve at the lower end of the choke ring in drilling liner cementing operation; thus, the labor hour of later drilling is reduced while the sleeve at the lower part of the choke ring can be protected better so as to protect the inner wall of the sleeve from being damaged by the drilling.

Description

technical field [0001] The invention relates to the technical field of tailpipe rubber plug devices, and relates to a tailpipe rubber plug device for removing the cement slurry in the lower casing of the liner cementing choke ring. Background technique [0002] At present, the existing liner cementing process in the market is filled with cement slurry in the lower casing of the choke ring after bumping. During the process, the lower casing will be damaged to a certain extent, which will seriously affect the cementing quality of the liner. Contents of the invention [0003] The invention provides a liner rubber plug device for removing the cement slurry in the lower casing of the liner cementing choke ring, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the current liner cementing requires drilling after bumping. Removing the cement plug at the lower part of the choke ring is not only time-consuming, but also t...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a liner rubber plug device for removing the cement slurry in the lower casing of the liner cementing choke ring, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the current liner cementing requires drilling after bumping. Removing the cement plug at the lower part of the choke ring is not only time-consuming, but also the casing is easily damaged during the drilling process

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