Subsea wellhead

Details Subsea wellhead Subsea wellhead

1993-02-16

1994-12-13

Britts, Ramon S.

Wells

Submerged well

Wellhead

166381, 166 85, E21B 33035

Patent

active

053721993

ABSTRACT:
The present invention relates to an improved subsea wellhead and to the method of retrieving the production string from the wellhead and the method of retrieving the tree from the wellhead. The wellhead includes a lower tubing hanger landing within the wellhead housing and an upper false tubing hanger landed within the tree. The upper false tubing hanger includes preps for receiving two plugs within its central bore above the radial bore through the upper tubing hanger which communicates with the radial bore through the tree through which production fluids flow from the well. A tubular member extends from the upper false tubing hanger to the lower tubing hanger and defines the flow passage through which production fluids flow between the two hangers. A sleeve surrounds the exterior of the tubular member and contains fluids communicated to the interior of the sleeve from the annulus surrounding the tubing string. Orienting means is provided to orient the upper false tubing hanger as it is being landed within the tree so that the radial passages in the upper false tubing hanger and the tree are in registry.

REFERENCES:
patent: 4089377 (1978-05-01), Chateau
patent: 4154298 (1979-05-01), Gano
patent: 4289206 (1981-09-01), Kirkland
patent: 4651831 (1987-05-01), Baugh
patent: 4691781 (1987-09-01), Gano
patent: 4736799 (1988-04-01), Ahlstone
patent: 4749046 (1988-06-01), Gano
patent: 4938289 (1990-07-01), Van Bilderbeek

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