Pipe joints or couplings – Pipe to discreet nipple or sleeve to plate – Expandable detent engages plate to hold nipple
Patent
1980-02-27
1982-04-13
Callaghan, Thomas F.
Pipe joints or couplings
Pipe to discreet nipple or sleeve to plate
Expandable detent engages plate to hold nipple
166 87, 166 88, 277 95, E21B 3304
Patent
active
043244220
ABSTRACT:
A pack-off seal assembly 26 particularly suitable for use for purposes of effecting a seal between a wellhead housing 18 and a casing hanger 16. The subject pack-off seal assembly 26 is designed to be interposed between the cylindrical wall surface 18a of the wellhead housing 18 and that of a casing hanger 16 so as to be movable between a non-sealing position and a sealing position relative thereto in response to an actuating force of low torque magnitude being applied thereto. The pack-off sealing assembly 26 includes an upper metal seal 30 having downwardly extending lips 44, a lower metal seal 32 having upwardly extending lips 46, and a plurality of independent non-bonded elastomeric members 36, 38 of differing diameters suitably supported between the upper and lower metal seals 30, 32. In addition, the upper and lower metal seals 30, 32 are provided with first and second means, respectively, that are designed to be operative to insure the retrievability of the lower metal seal 32 from between the wellhead housing 18 and the casing hanger 16 should removal of the pack-off seal assembly 26 be necessitated. The latter first and second means are cooperatively associated one with another so as to be operable to establish a lost motion connection between the upper metal seal 30 and the lower metal seal 32 when the pack-off seal assembly 26 is moved in a first direction between the non-sealing and sealing positions thereof, and so as to be operable to establish a rigid connection between the upper metal seal 30 and the lower metal seal 32 when the pack-off seal assembly 26 is moved in a second direction between the non-sealing and sealing positions thereof.
REFERENCES:
patent: 1777564 (1930-10-01), Hosmer
patent: 1811013 (1931-06-01), Humason
patent: 2447546 (1948-08-01), Spencer
patent: 2504025 (1950-04-01), Humason
patent: 2878876 (1959-03-01), Long
patent: 3797864 (1974-03-01), Hynes et al.
patent: 4131287 (1978-12-01), Gunderson et al.
Rains John K.
Reimert Larry E.
Callaghan Thomas F.
Fournier, Jr. Arthur E.
Vetco Offshore Inc.
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