Riser position indication apparatus

Details Riser position indication apparatus Riser position indication apparatus

1984-09-19

1986-09-23

Levy, Stuart S.

Wells

Submerged well

166345, 166355, 175 7, 340666, 340686, E21B 7128, G08B 2100

Patent

active

046129936

ABSTRACT:
Apparatus for use in drilling a well from a floating vessel by means of a riser, which connects the vessel's drilling equipment to a wellhead assembly adjacent to the ocean floor. The riser moves substantially vertically in relation to the vessel, as the vessel responds to wave action. The present riser position indication apparatus is comprised of a load cell and a chain attached beneath the load cell. Movement of the riser relative to the vessel alters the length of chain suspended from the load cell, thereby altering the signal from the cell. The signal can be subsequently calibrated to represent riser position.

REFERENCES:
patent: 3760402 (1973-09-01), Magerle et al.
patent: 4421173 (1983-12-01), Beakley
Composite Catalog of Oil Field Equipment and Services, 34th Revision, vol. 3, 1980-1981, published by World Oil, Gulf Publishing Company, page 4865.

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