Varco I/p, Inc.

David W Martin

John E Goode

Preston R Fox

Ronald William Yater

Ivan Iankov

Andrew Michel

Systems and method for operating subsea devices and pressure compensated reservoir systems useful therewith which in certain aspects, include a chamber with a piston therein acted on an exposed side by water, e.g. sea water, to provide operational hydraulic fluid for operating a subsea device, with a piston rod having an end in a separate chamber acted on by a fluid to compensate for a pressure differential between the pressure of the water on one piston side and the pressure of the operational hydraulic fluid on the other piston side.

Subsea pressure compensation system

The subsea intervention system (SIM) includes a BOP moduleand CT module. A tool positioning systemis used for positioning a selected subsea toolstored within a rackwith a tool axis in line with the BOP axis, while a marinized coiled string injectoris moved by positioning systemto an inactive position. Power to the subsea electric motorsis supplied by an electrical line umbilical extending from the surface for powering the pumps, with the hydraulic system controlled by power control unit. The injectorpreferably includes a pressure compensator roller bearingand a pressure compensated drive system case

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Cranston, RI, United States of America

David W Martin