A downhole energy harvesting system configured for use in a downhole tool. The system utilizes at least one harvesting antenna supported within the downhole tool. During operation, the harvesting antenna harvests energy from a beacon signal emanating from ...

Systems and methods according to these exemplary embodiments provide for a circuit 10 for switching from a first battery 12 to a second battery 14. The circuit includes: the first battery 12 configured to provide electrical energy to a device when a first ...

A method of supplying electrical power to at least one device (24) at a tree (11) of an underwater fluid extraction well comprises using magnetic resonance coupling for wirelessly transmitting power from a supply (1, 2, 3, 4) to the or each device.

A method of supplying electrical power to at least one device (12) at a tree (11) of an underwater fluid extraction well comprises using magnetic resonance coupling for wirelessly transmitting power from a supply (1, 2, 3, 4) to the or each device.

A method of supplying electrical power to at least one device (12) at a tree (11) of an underwater fluid extraction well comprises using magnetic resonance coupling for wirelessly transmitting power from a supply (1, 2, 3, 4) to the or each device.