Retrievable safety packer

Details Retrievable safety packer Retrievable safety packer

1996-06-07

1998-07-21

Suchfield, Geroge A.

Wells

Packers or plugs

With expanding anchor

166138, 166188, 166191, E21B 33122, E21B 33127

Patent

active

057822980

ABSTRACT:
The invention relates to a safety packer assembly for use in a cement-lined pipe. The assembly provides for the use of a packer body which carries one or more resilient collars that expand in response to a compression force created by rotation of an upper part of the packer body. A safety valve is provided in the upper part of the packer body to prevent escape of the downhole pressure. A safety centralizer is detachably secured to a lower part of the packer body, the centralizer being provided with a plurality of arcuate resilient members which extend along the length of the centralizer body and frictionally contact the wall of the cement-lined pipe to maintain the packer body in its predetermined position within the pipe and resist rotation of a lower part of the packer body when the upper part is rotated.

REFERENCES:
patent: 2131275 (1938-09-01), Crickmer
patent: 2799346 (1957-07-01), Baker et al.
patent: 3308886 (1967-03-01), Evans et al.
patent: 3338308 (1967-08-01), Elliston et al.
patent: 3409085 (1968-11-01), Oliver
patent: 4458751 (1984-07-01), Haynes
patent: 4548264 (1985-10-01), Manderscheid
patent: 4627491 (1986-12-01), Zunkel

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