Subsea well casing hanger packoff system

Details Subsea well casing hanger packoff system Subsea well casing hanger packoff system

F - Mech Eng,Light,Heat,Weapons

16

J

166/63

F16J 15/08 (2006.01) E21B 33/04 (2006.01) E21B 33/00 (2006.01)

Patent

CA 1318245

ABSTRACT An improved metal to metal seal packoff system for establishing a high pressure metallic barrier between adjacent surfaces of concentric tubular elements in a well head housing and casing hanger, is provided. The packoff comprises assemblies of parts including uniquely configured metal seal elements and seal energizers therefor, which cooperate in a novel manner to produce a significantly improved seal with considerably enhanced ability to withstand unusually high fluctuations in well pressures. The packoffs are relatively easy to assemble and are capable of installation as an assembled unit into a subsea or other remotely located wellhead without complicated procedures or other detrimental problems. The packoff seal is locked in a retracted, unenergized position while it is being run or otherwise placed in proper position in the well head and activated to expand the metal seal lips into energized contact with the opposed surfaces of the wellhead. Such activation cannot occur until performed by the operator through use of a packoff running tool.

587002

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