Patent ID: 9097089
Filing Date: 2015-08-04
Classification: E21B,H01F,H02J

Abstract:
1. A method of supplying electrical power to at least one device at a tree of an underwater fluid extraction well, the method comprising: using magnetic resonance coupling for wirelessly transmitting power from a supply to the at least one device, wherein there is a plurality of the at least one device, each device being powered via a respective receiver circuit which can be coupled by magnetic resonance coupling with a transmitter circuit of said supply; transmitting a code unique to at least one of the plurality of devices by wireless communication to the receiver circuit of the device, wherein said code is generated according to a demand from control circuitry in a subsea electronics module associated with the tree; and detecting the code at the receiver circuit of the device to cause power to be supplied to the device by magnetic resonance coupling; wherein the at least one device is a directional control valve that is powered according to the demand on a line from directional control valve control circuitry of the subsea electronics module.