Welhead templates
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United States of America Patent
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Jun 25, 2002
Grant Date -
N/A
app pub date -
Jan 25, 2001
filing date -
Jul 3, 1998
priority date (Note) -
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Abstract
A drilling and production template for sub-sea wells comprises a plurality of individual limbs (1-4) each with a central hub (10-14) at one end of an arm (11-41) and a drilling receptable (12-42) on the other end of the arm. The hubs are of different diameters such that they fit within each other in a telescopic manner. They have cut-out (27, 37, 47) accommodate the arms of the other limbs when installed. The template may be deployed onto a pre-installed foundation with the arms stacked vertically above the other, in such manner as to pass through the moonpool of a drilling vessel. The complete assemblies are installed on a mechanical running tool attached to a drilling string. After the template is disposed on the foundation, the drilling string is rotated, causing the running tool to rotate the limbs (1-4) so that the hubs telescope into each other, providing a splayed multi-well drilling and production template.
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