Outer tube packer

Abstract

The invention relates to the technical field of oil field packers, in particular to an external casing packer. The external casing packer comprises a spindle, an upper connector, a middle connector, a lower connector, an outer cylinder and a rubber cylinder assembly, wherein the upper connector and the lower connector are respectively fixedly mounted on the outer side of the upper portion of the spindle and on the outer side of the lower portion of the spindle, the middle connector sleeves the outer side of the middle portion of the spindle, and the outer cylinder is fixedly mounted on the outer side of the upper portion of the lower connector. The external casing packer has the advantages that the external casing packer is reasonable and compact in structure, convenient to use, simple in structure, easy to mount and high in reliability; high-pressure fluid enters a sealing cavity to push an inner slide sleeve to move upwards so as to cut off a shear pin to push the rubber cylinder to perform expansion sealing, rubber cylinder contraction is prevented through two-way inverted teeth, and the outer cylinder is fixed during the whole setting process; a two-way inverted-tooth ring with a facture is meshed with the inner side of the outer cylinder, and the radial expandability of the two-way inverted-tooth ring guarantees that the inner slide sleeve passes smoothly; the packer can be effectively prevented from getting caught and stuck, setting in advance can be effectively prevented, and the situation that the two-way inverted-tooth ring blocks the passage of the inner slide sleeve can be avoided.

Description

technical field [0001] The invention relates to the technical field of oil field packers, and relates to an external packer. Background technique [0002] During the cementing operation after the drilling of a vertical well or a special well, it is often necessary to perform an isolation operation between layers outside the pipe for each section of the well. This construction technology requires a type that can be used in conjunction with casing and rubber plug floating hoops to effectively prevent oil, gas, and water from moving up or between layers during cementing when the cement slurry is waiting. Conventional extra-tubular packers are moved by the outer cylinder, which is likely to be stuck during the process of tubing stringing into the well, which will cause the packer to set in advance and fail. Therefore, conventional extra-tubular packers have the possibility of pre-setting Risk issues; and individual push-in packers also have anti-falling teeth that are not easy ...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an extra-pipe packer, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the In the process of entering the well, there are problems of getting stuck and setting in advance, and the anti-falling teeth of individual push-in packers are not easy to install, and they are easy to get stuck with the sliding sleeve, resulting in the failure of setting

[0004] The present invention further solves the problem of irregular expansion and extrusion loss of the rubber tube

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