Ground subsiding wellhead

Details Ground subsiding wellhead Ground subsiding wellhead

1989-06-09

1990-12-04

Dang, Hoang C.

Wells

Above ground apparatus

Inner member anchor or seal with lateral port

166 67, 166 89, E21B 33047

Patent

active

049746766

ABSTRACT:
A ground subsidence wellhead has a lower wellhead assembly mounted on the ground for supporting a casing in tension and an upper wellhead assembly threaded to the top of the casing and spaced from the lower wellhead assembly. The lower assembly has a casing head with aconical bowl for receiving a slip. The slip is wedged between the casing head and casing by compression springs acting between the casing head and the slip, and has asymmetrical teeth for engaging the casing to prevent downward, but allow upward, movement of the casing in the slip.

REFERENCES:
patent: 3011552 (1961-12-01), Rhodes et al.
patent: 3134610 (1964-05-01), Musolf
patent: 3166125 (1965-01-01), Hubby
patent: 3192592 (1965-07-01), Yancey
patent: 3316963 (1967-05-01), Boldrick et al.
patent: 3738426 (1973-06-01), Drouin
patent: 3741297 (1973-06-01), Drouin
Burley et al., "A Solution to Ground Subsidence Problems in Casing Strings and Wellheads", The Journal of Petroleum Technology, pp. 654-660, June 1971.

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