E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/43
E21B 23/06 (2006.01) E21B 33/03 (2006.01) E21B 33/04 (2006.01) F16J 15/46 (2006.01) E21B 33/00 (2006.01)
Patent
CA 1196857
Packoff and Seal Ring Assembly Abstract A packoff for sealing between an external cylindrical surface and a member therearound having a resilient ring, metal seal rings on the end surfaces of the resilient ring, the exterior of the resilient ring being concave to provide an annular recess, means for injecting and pressurizing plastic packing in said annular recess to cause sealing engagement of said metal seal rings and means to prevent leakage of pressure from the annular recess, and the inner and outer flanges on said metal seal rings providing a metal-to-metal seal. Background The pressure, temperature and chemical conditions in many oil and gas wells are such that considerable difficulty has been experienced in prior packoff and seal ring structures for sealing around tubing, casing or a mandrel in oil and gas wells. Resilient seals have been subject to permeation problems, extrusion and breakdown when subjected to the elevated temperatures and high pressures encountered in such wells. Further, many of such wells contain fluids and gases which may chemically attack the resilient material of such seals. Use of metal-to-metal seals in such applications has re- quired selective sizing with respect to the outside diameter of the inner sealing surface. Most current seals are resilient seal rings which require an anti-extrusion device but anti-extrusion devices, such as shown in U.S. Patent No. 4,219,204 are not applicable when there is a large range of gap widths to be bridged. Such range results from allowed tolerances in the manufacture of
416073
Cameron Iron Works Inc.
Smart & Biggar
LandOfFree
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