E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/51.3
E21B 33/02 (2006.01) E21B 33/04 (2006.01) F16J 15/08 (2006.01) E21B 33/00 (2006.01)
Patent
CA 1180268
SEAL ASSEMBLY Abstract of the Disclosure A wellhead sealing assembly comprising a metallic sealing ring (10) which is compressed and deformed by tubing hanger load and fluid pressure to establish metal-to-metal sealing contact with the tubing hanger (20) and the tubing head (30). The outer surface of the sealing ring includes an upper cy- lindrical surface (11) and a lower downward facing frusto-conical surface (16) which coact respectively, with the bore wall of the tubing head (30) and an upward facing frusto-conical shoulder(33) in the tubing head bore (32) It is also provided with an annular end surface (13) which is radially transverse to the ring axis and coacts with a corresponding downward facing shoulder (22) on the tubing hanger (20) which seats thereagainst. The metallic ring (10) also comprises inner annular surfaces in the form of an upward facing frusto-conical surface (15) and a lower cylindrical surface (12) which coacts respectively witha downward facing frusto-conical surface (23) and a cylindrical surface (24) on a reduced diameter section of the tubing hanger. When the tubing hanger is seated on the upper end surface (13) of the sealing ring (10), there is a 5° difference in the angles of taper between the inner frusto-conical surface (15) of the sealing ring (10) and the outer frusto-conical surface (23) of the tubinghanger (20) with the two frusto-conical surfaces contacting only at their upper extremities. When compression loads are applied, the sealing ring is compressed and deformed radially to coact and establish sealing metal-to-metal contact with the bore (32) of the tubing head (30) and the external tapered and cy- lindrical surfaces (23, 24) of the tubing hanger 20.
412151
Joy Manufacturing Company
Ridout & Maybee Llp
LandOfFree
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