E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/62
E21B 23/00 (2006.01) E21B 33/12 (2006.01) F16J 15/16 (2006.01) F16J 15/20 (2006.01) E21B 33/00 (2006.01)
Patent
CA 1109784
TITLE: CONDUIT SEALING SYSTEM ABSTRACT OF THE INVENTION A seal system is provided with a series of annular seal assemblies separated by relatively rigid spacing members and may be preferably adapted to selectively sealing engage a packer apparatus within a well bore conduit, during the completion or work over of a subterranean oil or gas well. Preferably, each seal assembly comprises four annular seal members in sequence. The outermost seal members are formed from a thermoplastic polymer having a co- efficient of expansion greater than that of the rigid spacing members and the conduit, with physical resistance to corrosive chemicals and high temperature and pressure environments. The outermost member has a physical hardness sufficient to withstand extrusion into a gap defined between the rigid spacing member and the conduit by pressure transmitted from the rigid spacing member. One of the inner seal members is a flexible perfluoro polymer with enhanced permanent set and cold flow. The second of the inner seal members is an elastomer derived from the co- polymerization of tetrafluoroethylene and perfluoroethers.
335547
Baker International Corporation
Borden Ladner Gervais Llp
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