E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/51.3
E21B 33/038 (2006.01) E21B 33/04 (2006.01) F16J 15/20 (2006.01) E21B 33/00 (2006.01)
Patent
CA 1174966
-17- PACKING ASSEMBLY Abstract of the Disclosure A packing assembly (10) for sealing the annulus between con- centric tubular members (12, 14). The assembly (10) includes upper and lower sealing ring assemblies (31, 32) on each side of a lantem ring (33), and upper and lower retainer rings (36, 35) located atop and below the sealing ring assemblies and bolted together to maintain the rings in stacked concentric relation. Each sealing ring assembly (31, 32) includes a central lubricating packing ring (34) having inner and outer lubricating surfaces of graphite material; an inner pair of upper and lower metal seal rings (69, 70) seated in annular grooves in the central lubricating packing ring (34); and an outer pair of upper and lower metal seal rings (83, 84) located in annular. grooves in the outer periphery of the lubricating packing ring (34). The metal seal rings and the packing ring are each provided with cooperative camming surfaces (72 and 41; 76 and 46; 85 and 61; 88 and 66) which inter- act when an axial compressive force is applied to the assembly (10) to there- by effect a controlled radial expansion of the sealing ring assemblies (31, 32) and establishing metal-to-metal seals (81, 82) and a lubricating packing seal with the annulus walls (11, 13). The axial compressive force is mechanically applied by the camming action of holddown screws (100) with a camming sur- face (102) on the upper retainer ring (36) and the outer tubular member is provided with an aperture (110) to permit injection of lubricant into the lantern ring for energizing the seals in emergency situations.
412749
Acf Industries Incorporated
Ridout & Maybee Llp
LandOfFree
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