Abstract: A hydraulic control system for controlling an external device (4) at a well installation includes a control module (2) for generating electrical and/or optical control signals. A control pod (8) receives the control signals, the control pod controlling the external device. A hydraulic line (10) links the control pod to the external device (4) for controlling it.

Abstract: A hydraulic control system for controlling an external device (4) at a well installation includes a control module (2) for generating electrical and/or optical control signals. A control pod (8) receives the control signals, the control pod controlling the external device. A hydraulic line (10) links the control pod to the external device (4) for controlling it.

Abstract: A hydraulic control system for controlling an external device (4) at a well installation includes a control module (2) for generating electrical and/or optical control signals. A control pod (8) receives the control signals, the control pod controlling the external device. A hydraulic line (10) links the control pod to the external device (4) for controlling it.

Abstract: A system for use in controlling a hydrocarbon production well has a: computer at a control location remote from a well tree of the well. A processor at the well tree applies control signals to and receives signals from devices of the well tree. The processor also receives further signals associated with the operation of the well. A bi-directional communication link extends between the remote computer and the well tree processor. The well tree further has a communications router coupled with the processor and receiver, for multiplexing the signals from devices at the well head and the further signals on to the bi-directional link.

Abstract: A system for use in controlling a hydrocarbon production well has a: computer at a control location remote from a well tree of the well. A processor at the well tree applies control signals to and receives signals from devices of the well tree. The processor also receives further signals associated with the operation of the well. A bi-directional communication link extends between the remote computer and the well tree processor. The well tree further has a communications router coupled with the processor and receiver, for multiplexing the signals from devices at the well head and the further signals on to the bi-directional link.

Abstract: An underwater hydrocarbon production system comprises power supply means (1,3,4) at or for use at a remotely located station (2) for providing DC; electrical means (6) at or for location underwater for using DC to provide power for an underwater device; and transmission cabling (5) for transmitting DC from the power supply means to the electrical means.

Abstract: A hydrocarbon production system comprises a topside installation connected to a underwater distribution unit 4 by an umbilical 3. The unit 4 is connected to Christmas Trees 8, 9 and 10 by respective ones of jumper interconnects 11, 12 and 13. Each Christmas Tree may comprise one or more of an electrical actuator 14, flow rate control choke 16, pressure and/or temperature transducers 18, down hole measurement transducers 18a and/or a down hole safety valve 21. Electrical power is transmitted to the unit 4 by a high voltage transmission cable forming part of the umbilical 3. A transformer forming part of the unit 4 steps down the voltage transmitted over the umbilical 3 to a level suitable for use by the electrical devices 14, 16 and 21. Power and control of the devices 14, 16, 18, 18a, 21 is effected by an underwater controller 5, 6, 7 associated with its respective Christmas Tree 8, 9, 10.

Abstract: A system for use in controlling a hydrocarbon production well has a: computer at a control location remote from a well tree of the well. A processor at the well tree applies control signals to and receives signals from devices of well tree. The processor also receives further signals associated with the operation of the well. A bi-directional communication link extends between the remote computer and the well tree processor. The well tree further has a communications router coupled with the processor and receiver, for multiplexing the signals from devices at the well head and the further signals on to the bi-directional link.