Apparatus for providing electrical power to subsea equipment in a subsea well facility comprises, at a topside location: first means (1, 2, 6) for providing a direct electrical current; second means (7) for converting said direct electrical current to an a...

A system is disclosed for transmitting alternating current power and communication signals between a first location and a second location via a communication path which includes at least one inductive load (5) and at least one switching means (13) for swit...

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.

There is disclosed a method of using an umbilical (3) between a surface location (1) and an underwater location of an underwater fluid extraction well system, the umbilical carrying an electrical power conductor and having been compromised by the ingress o...

A subsea electronics module for an underwater well installation comprises a housing and first electronic components located within the housing as a first system to provide functions of a subsea electronics module, wherein second electronic components are l...

A method for providing auxiliary electrical power to an underwater well installation, the installation being linked to a surface location via an umbilical cable (1), to supplement any electrical power received at the installation from the umbilical cable, ...