Underwater well completion method and apparatus
Patent
·
OSTI ID:7092378
An extending casing method and apparatus for completing an underwater well are described whereby complete and continuous pressure control is maintained at the surface drilling platform. A conductor casing is installed in the floor of a body of water with a casing head and riser attached near the floor. Other casing is installed and supported at the water floor by hanger heads and having other risers extending upward therefrom. Pressure control equipment is installed at the upper end of one of the risers. A tubing head designed to pass through the pressure control equipment and riser to which it is attached may be lowered to the innermost hanger-head and remotely latched thereto. Orientation apparatus may be lowered into the tubing head and attached thereto. A tubing hanger and tubing may be lowered through the pressure control equipment and latched to the tubing head in an annular position determined by the orientation apparatus. The tubing is plugged, the riser and control equipment removed, and a Christmas tree assembly attached to the wellhead in fluid-tight flow communication with the tubing string. (45 claims)
- Assignee:
- Courtaluds Ltd
- Patent Number(s):
- US 3741294
- OSTI ID:
- 7092378
- Country of Publication:
- United States
- Language:
- English
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