Patent ID: 8220534
Filing Date: 2012-07-17
Classification: E21B

Abstract:
1. A safety device for a fluid production well, comprising: a valve housing to be fixed tightly inside a fluid flow conduit, the valve housing delimiting a fluid flow passage, the valve housing comprising means for holding the valve in the open position against the permanent biasing means, the holding means comprising a movement element for the valve, the movement element being movable in the valve housing between a rest position and an active valve biasing position of the valve, and a return element permanently biased for returning the movement element to the rest position; a hydraulic cylinder for hydraulically actuating the holding means; and a hydraulic control unit for controlling the hydraulic cylinder by a control signal so as to actuate the holding means upon receipt of a valve open control signal by the hydraulic control unit, and so as to deactivate the holding means in the absence of the valve open control signal, wherein the holding means, the hydraulic cylinder and the hydraulic control unit are connected to the valve housing so as to be simultaneously movable together with the valve housing under the control of the working wire line.