Cff Technologies Limited

Managed Pressure Operations Pte, Limited

Optima Solutions UK Limited

Stuart Thomas Rothnie

Rae Andrew Younger

Keith Scott Gaskin

Bruce Thornton Jepp

Christian Leuchtenberg

Jamie Oag

Jonathan Peter Buckland

James Bisset

Baptiste Gougeon

Eric Brechet

A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.

Downhole actuator

A valve assembly comprising a body having a main passage, and a valve member which is located in the main passage and which is rotatable between an open position in which the main passage is substantially open, and a closed position in which the valve member substantially blocks the main passage, and an actuator which is movable generally parallel to the longitudinal axis of the main passage, the actuator being engaged with the valve member such that movement of the actuator generally parallel to the longitudinal axis of the main passage causes the valve member to rotate between its open and closed positions.

Valve assembly

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Inverurie, United Kingdom

Stuart Thomas Rothnie