Well-head structures

Details Well-head structures Well-head structures

1994-02-23

1996-07-16

Melius, Terry Lee

Wells

Submerged well

With safety or emergency shutoff

166368, 1662441, E21B 3404

Patent

active

055358268

ABSTRACT:
This invention relates to well-head structures, and particularly to so-called christmas trees, i.e. the complex of valves and pipes installed at a well-head to control the flow of high pressure oil or gas. The invention more particularly, but not exclusively relates to such structures for use in sub-sea structures. In order to accommodate all the required valves and pipes, known trees are normally undesirably high--i.e. of the order of 18 feet or so. In order that trawler nets do not snag on such trees, expensive protection structures or well reinforcing may be required to be installed around each tree. However, the present invention provides a christmas tree including a valve assembly comprising one or more valves installed at a well-head to control the flow of produce thereat, at least one of the one or more valves being retained within an outlet of the well-head.

REFERENCES:
patent: Re27464 (1972-08-01), Taylor, Jr.
patent: 3411576 (1968-11-01), Taylor, Jr.
patent: 3457991 (1969-07-01), Sizer et al.
patent: 3796257 (1974-03-01), Hudson
patent: 3866676 (1975-02-01), Buans
patent: 4116272 (1978-09-01), Barrington
patent: 4320804 (1982-03-01), Brooks
patent: 4880060 (1989-11-01), Schwenemann et al.
patent: 4934871 (1990-06-01), Kazokas, Jr.
patent: 5050680 (1991-09-01), Diehl et al.

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