Patent ID: 11933129
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 6:
7. A drilling system, comprising:
a rig; and
a subsea wellhead assembly configured to perform multiple drilling functions and comprising a wellhead, a blowout preventer stack, and a lower marine riser package (LMRP), wherein:
the rig is coupled to the subsea wellhead assembly but is not coupled so as to provide hydraulic control fluid from the rig to the subsea wellhead assembly to enable the multiple drilling functions;
the blowout preventer stack includes an energy storage device and at least one remote operating vehicle (ROV) charging port coupled to the energy storage device, the ROV charging port being configured to receive power from a ROV for charging the energy storage device;
electrical power supplied from the energy storage device is converted to a plurality of different voltages by circuitry of the subsea wellhead assembly; and
at least one of the multiple drilling functions is performed using at least one of the plurality of different voltages.