Seal assembly

Details Seal assembly Seal assembly

E - Fixed Constructions

21

B

166/17

E21B 33/14 (2006.01) E21B 33/12 (2006.01) E21B 33/16 (2006.01) E21B 34/06 (2006.01) E21B 34/12 (2006.01) E21B 34/14 (2006.01) E21B 41/00 (2006.01) E21B 43/10 (2006.01)

Patent

CA 1147256

Abstract of the Disclosure Disclosed is apparatus for sealing between two concentric annular surfaces whereby the sealing engagement may be disrupted in response to an excess pressure differential acting on the sealing apparatus in one axial direction sense. Elastic means restore the apparatus to its sealing configuration upon reduction of the pressure differential. Apparatus and method disclosed are particularly applicable to cementing liners in wells.

376188

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