Transocean Sedco Forex Ventures Limited

Transocean Offshore Deepwater Drilling Inc.

Scott Reynolds

Craig McCormick

Darrel Pelley

Mete Mutlu

Jean Paul Buisine

Robert Mebane

Craig Mccormick

Robert Eugene Iii Mebane

A pumping system includes a plurality of pumps, each having an inlet and an outlet. The inlet is fluidly coupled to a hydraulic fluid reservoir. The outlet is fluidly coupled to a control pod having a valve and a pair of sensors monitoring upstream and downstream pressures of the valve. The control pod is fluidly coupled to a subsea blowout preventer. A first motor is coupled to a first pump of the plurality of pumps and sets the first pump at a first predetermined pressure. A controller is coupled to and configured to control the first motor, thereby controlling the first pump. The pumping system is configured to: engage and disengage each pump independently; and de-stroke each pump to limit pressure to the valve, when a predetermined pressure for each pump is attained, thereby reducing fluid hammer at the control pod.

Systems for reducing fluid hammer in subsea systems

In some embodiments, a method for executing an emergency disconnect sequence in shallow water depth includes unlatching a lower marine riser package (LMRP) of a blowout preventer (BOP) from a lower stack of the BOP. The BOP defines a wellbore fluidically coupled to the subsea wellhead. A tubular is disposed within the wellbore. The method further includes shearing the tubular and sealing the wellbore. In response to an indication that a vessel operably coupled to the BOP has failed to keep station, an unlatch sequence and a shear and seal sequence are initiated, such that each sequence occurs at least partially simultaneously. The unlatch sequence includes disconnecting the LMRP from the lower stack, and the shear and seal sequence includes activating the lower stack to shear the tubular in less than about one second and seal the wellbore.

Station keeping and emergency disconnecting capability for a vessel connected to a subsea wellhead in shallow water

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Houston, TX, United States of America

Scott Reynolds