| 摘要 |
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.
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