Riser position indication apparatus

Details Riser position indication apparatus Riser position indication apparatus

E - Fixed Constructions

21

B

33/112

E21B 19/09 (2006.01) E21B 19/00 (2006.01)

Patent

CA 1252996

A B S T R A C T RISER POSITION INDICATION APPARATUS 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. This signal can be subsequently calibrated to represent riser position.

489483

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