Title: Riser tensioner

Abstract: A modular riser tensioner has a frame (10) for mounting on a platform deck with air (16,18) and oil (20,22) accumulators mounted on a mounting frame and connected to cylinders (24-30) also on the mounting frame. A piston (32) located within the cylinders carries a riser tensioning ring (50) for supporting the riser. Pairs of cylinders are located on opposite sides of the riser and connected to an oil accumulator independent of the other cylinders.

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Inventors: Widiner, Karl J. (Carpinteria, CA)
Goldsmith, Riley G. (Houston, TX)

Application Number: 06/161235
Filing Date: 1980-06-19
Publication_date: 1983-04-12
Assignee: CONOCO INC

Primary Class(es): 405/224.400 405/303, 405/168.400
Other Classes: E21B7/128; E21B19/00; E21B7/12; B63B35/44
US Patent Ref:

2841961	July, 1958	Lucas	405/203	Off-shore drilling barge
3171259	March, 1965	Roussel	405/199	Offshore drilling barge
3378086	April, 1968	Kivisld	175/7	Stationary overwater platform
3718316	February, 1973	Larralde et al.	254/172	HYDRAULIC-PNEUMATIC WEIGHT CONTROL AND COMPENSATING APPARATUS
3955621	May, 1976	Webb	175/7	Riser assembly
4004532	January, 1977	Reynolds	114/256	Riser tension system for floating platform
4121806	October, 1978	Iato et al.	254/172	Apparatus for compensating variations of distance
4142584	March, 1979	Brewer	175/7	Termination means for a plurality of riser pipes at a floating platform
4213720	July, 1980	Portass	405/195	Tensioning of members

Other Refs: Other References: Vetco Offshore, Inc., Catalog, pp. 5890, 5891.
ETA Chapter from "The Technology of Offshore Drilling", Completion and Production, Compiled by ETA Offshore Seminars, Inc.

Primary Examiner: Taylor, Dennis L.
Assistant Examiner:
Attorney: