Wells – Above ground apparatus – With seal for reciprocating member
Patent
1981-05-20
1983-06-28
Novosad, Stephen J.
Wells
Above ground apparatus
With seal for reciprocating member
166 88, 166 90, 277 30, 277125, 285187, 285302, E21B 3303, F16L 1702, F16L 2104, F16L 2712
Patent
active
043900631
ABSTRACT:
A geothermal wellhead assembly (22) has a casing head (26). An inner casing (12) within the casing head has a restrained lower end portion and an unrestrained upper end portion extending above the casing head. An expansion spool (28) is mounted on the upper end of the casing head and receives the upper end portion of the inner casing. An expansion sleeve (92) fits within the expansion spool. The outer surface (94) of the expansion sleeve is adjacent the inner surface (60) of the expansion spool and an annular space (98) is defined by the inner surface (96) of the expansion sleeve and the outer surface (76) of the inner casing. A packing assembly (108) is mounted within the annular space and extends in sealing relation between the inner casing and the expansion sleeve. The packing assembly is movable with the upper end portion of the inner casing as the inner casing moves longitudinally in response to temperature changes within the wellhead.
REFERENCES:
patent: 2615952 (1952-10-01), Rifenburg
patent: 3944263 (1976-03-01), Arnold
patent: 3976130 (1976-08-01), Chambless et al.
patent: 4299395 (1981-11-01), Reed
Marnock Marvin J.
Novosad Stephen J.
W-K-M Wellhead Systems, Inc.
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