Horizontal tree block for subsea wellhead and completion method

Details Horizontal tree block for subsea wellhead and completion method Horizontal tree block for subsea wellhead and completion method

1997-12-01

2000-06-20

Lillis, Eileen Dunn

Wells

Submerged well

Wellhead

166344, 166360, 166 951, 166382, E21B 3404

Patent

active

060766050

ABSTRACT:
A subsea wellhead assembly has a tubular housing having a sidewall, an axial bore, and a housing lateral passage extending from the bore through the sidewall. A blocking sleeve fits around the housing to block the housing lateral passage while drilling through the housing. A tubing hanger is secured to a string of tubing and landed in the housing. The tubing hanger has a vertical passage which communicates with the tubing and a tubing lateral passage which extends from the vertical passage and registers with the housing lateral passage. A lower annulus port is in the sidewall of the housing below the lower seal and leads to a tubing annulus. An upper annulus port is in the sidewall of the housing above the upper seal and leads to the bore of the housing. A tree block having a central opening for receiving the housing is lowered over the housing after removal of the blocking sleeve. The tree block has a tree production passage which registers with the housing lateral passage for directing flow of production fluid from the well. A production valve is mounted to the tree block for opening and closing the tree production passage. A bypass passage in the tree block connects the upper and lower annulus ports to communicate the bore above the tubing hanger with the tubing annulus.

REFERENCES:
patent: 5465794 (1995-11-01), McConaughy et al.
patent: 5544707 (1996-08-01), Hopper et al.
patent: 5575336 (1996-11-01), Morgan
patent: 5868204 (1999-02-01), Pritchett et al.
patent: 5884706 (1999-03-01), Edwards

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