Wells – Processes – Placing or shifting well part
Patent
1994-03-01
1995-08-15
Neuder, William P.
Wells
Processes
Placing or shifting well part
166123, 166134, 166135, E21B 33127
Patent
active
054411114
ABSTRACT:
This invention relates to a retrievable bridge plug for use in down-hole casing or tubing conduit. A problem exists in known plugs, namely slippage thereof within the casing resulting in breakage of a seal therebetween. The present invention provides a plug which can be set by urging outermost and innermost cylindrical members relative to one another in their longitudinal directions in so doing anchoring slips 19a, 19b and locating a packing element 11a, 11b on an inner surface of the casing, biasing means 30a, 30b providing a predetermined force to the packing element 11a, 11b greater than that required to provide a seal whereby the plug is retained within the casing.
REFERENCES:
patent: 3575237 (1971-04-01), Malone
patent: 3602305 (1971-08-01), Kisling, III
patent: 4018274 (1977-04-01), Cochran
patent: 4284137 (1981-08-01), Taylor
patent: 4411435 (1983-10-01), McStravick
patent: 4438933 (1984-03-01), Zimmerman
patent: 4515213 (1985-05-01), Roger et al.
patent: 4548265 (1985-10-01), Luke
patent: 4697640 (1987-10-01), Szarka
Neuder William P.
Petroleum Engineering Services Limited
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