Tubing hanger with fail-safe control passageway

Details Tubing hanger with fail-safe control passageway Tubing hanger with fail-safe control passageway

1977-09-08

1978-11-14

Purser, Ernest R.

Wells

Above ground apparatus

With valve on cap or head

166 85, 166319, 166 87, E21B 3303

Patent

active

041251555

ABSTRACT:
A tubing hanger supported in a wellhead and in turn supporting tubing therefrom, and having an upper end adapted to be engaged by a Christmas tree. The hanger includes an annulus control passageway extending between the annulus between the tubing and casing and the Christmas tree and includes one or more safety valve control passageways for controlling subsurface safety valves. Valves are connected to each of the passageways for opening and closing the passageways with springs urging the valves to a closed position whereby the passageways will be closed when the tubing hanger is installed so that the well is completely closed when the tubing hanger is landed. The valves are exposed to the exterior of the hanger whereby the valves may be actuated to an open position by mechanical and/or hydraulic controls connected to the Christmas tree.

REFERENCES:
patent: 3273646 (1966-09-01), Walker
patent: 3324951 (1967-06-01), Balmer et al.
patent: 3468559 (1969-09-01), Ahlstone
patent: 3814179 (1974-06-01), Hull, Jr.

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