Title:
Submarine cellar for deep water drilling operations
United States Patent 3202217

Inventors:
Watts, John D.
John, Slack
Publication Date:
08/24/1965
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Assignee:
GRAY TOOL CO
Primary Class:
166/350
Other Classes:
175/5, 166/358, 166/356
International Classes:
E21B7/12; E21B33/037; E21B33/03
US Patent References:
2512783Marine drilling
2684575Submergible type offshore drilling structure
2783970Apparatus for underwater oil well drilling
2906500Completion of wells under water
3017934Casing support
3101798Marine drilling apparatus