Importance

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Abstract

A subsea test tree includes a body having a flow passage therethrough. A closure valve is movable between open and closed positions for opening and closing the flow passage. A signal receiver of the subsea test tree receives an acoustic command signal transmitted down a pipe string connecting the subsea test tree to a floating surface structure. An actuator is operably associated with the signal receiver and moves the closure valve to one of its open and closed positions in response to the acoustic command signal. Acoustic couplers are connected between adjacent pipe segments for aiding in the transmission of the acoustic signals across joints between pipe segments. A double sliding sleeve valve hydraulic connector connects fluid passages of an upper portion of the subsea test tree with fluid passages of a lower portion of the subsea test tree. A hydraulically powered latch connects and disconnects the upper and lower portions of the subsea test tree in response to the acoustic command signals.

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First Claim