Wellhead flange for interconnecting a threaded wellhead and a fl

Details Wellhead flange for interconnecting a threaded wellhead and a fl Wellhead flange for interconnecting a threaded wellhead and a fl

1994-09-28

1996-02-20

Arola, Dave W.

Pipe joints or couplings

Elbow

285 12, 285143, 285368, 285414, 285349, F16L 5500

Patent

active

054923735

ABSTRACT:
A wellhead flange assembly 12 is provided for interconnecting the threaded end of an upwardly projecting screwed wellhead 16 with a lower flange of the blowout preventer 24. The flange assembly comprises a threaded adapter 40 including a thin-walled portion 54, a flange support portion 56, and an upper stop portion 52. A wellhead flange 42 includes a plurality of bolt holes 44 and an upper surface 51 for engagement with the lower flange of the blowout preventer. A plurality of securing members 48 are provided for selectively connecting and disconnecting the wellhead flange 42 and the threaded adapter 40. An adapter-to-flange seal 60 is provided for sealing engagement between the threaded adapter 40 and the wellhead flange 42. According the method of the invention, the threaded adapter may be easily heated to facilitate removal from the screwed wellhead, or may be cut off the screwed wellhead without damaging the screwed wellhead, thereby permitting the reuse of the wellhead flange on a new well.

REFERENCES:
patent: 2109031 (1938-02-01), O'Neal
patent: 2826436 (1958-03-01), Hupp et al.
patent: 3850455 (1974-11-01), Stafford
patent: 4225161 (1980-09-01), Smith
patent: 4252346 (1981-02-01), Sundholm
patent: 4538835 (1985-09-01), Sundholm
patent: 5000492 (1991-03-01), Kemp
patent: 5163712 (1992-11-01), Subo et al.

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