A Performance Review of the SEDCO 135-F Semi-Submersible Drilling Vessel
- J.S. Watts (Shell Canada Limited) | R.E. Faulkner (Shell Canada Limited)
- Document ID
- Petroleum Society of Canada
- Journal of Canadian Petroleum Technology
- Publication Date
- April 1968
- Document Type
- Journal Paper
- 67 - 77
- 1968. Petroleum Society of Canada
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- 89 since 2007
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This paper describes the operational performance of the offshore drilling vessel SEDCO 135-F during the first ten months of exploratory drilling for Shell Canada Limited, off the west coast of British Columbia. Four wells have been drilled, for a total footage of 37,852 feet in 270 days, since the commencement of operations in June, 1967 and drilling is now in progress at the fifth test site.
The vessel has remained on location continuously throughout the winter in the face of storm winds gusting to 92 mph and seas of up to 58 feet. Drilling operations have been conducted in 72-mph winds and 30- to 40-ft seas.
Included in the paper is a drilling time summary and a review of weather and sea conditions encountered to date. Response data recorded on the SEDCO 135-F are compared with model test data accumulated prior to the start of the program. Performance data on the vessel, its mooring system and the associated drilling equipment are presented.
Operating experience accumulated during the first ten months of drilling with the SEDCO 135-F confirms the feasibility of year-round drilling operations off the west coast of British Columbia.
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