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.

Abstract: A method and apparatus are presented which are particularly useful in testing the production capabilities of offshore oil wells. The apparatus includes a normally closed, weight operated valve which opens a preset delay after the weight operated valve is subjected to sufficient weight such as when a test string is set down upon, and supported by, a packer isolating an underground formation; and a normally open, weight and pressure operated valve which closes immediately when the test string is set down upon the packer. The weight and pressure operated valve expands a sealed chamber when subjected to sufficient weight to close its associated valve. The weight and pressure operated valve also includes a pressure responsive piston which opens and closes the valve, and which is responsive to the pressure in the sealed chamber, and to fluid pressure in the well annulus.

Abstract: A method and apparatus are presented which are particularly useful in testing the production capabilities of offshore oil wells. The apparatus includes a normally closed, weight operated valve which opens a preset delay after the weight operated valve is subjected to sufficient weight such as when a test string is set down upon, and supported by, a packer isolating an underground formation; and a normally open, weight and pressure operated valve which closes immediately when the test string is set down upon the packer. The weight and pressure operated valve expands a sealed chamber when subjected to sufficient weight to close its associated valve. The weight and pressure operated valve also includes a pressure responsive piston which opens and closes the valve, and which is responsive to the pressure in the sealed chamber, and to fluid pressure in the well annulus.

Abstract: A method and apparatus are presented which are particularly useful in testing the production capabilities of offshore oil wells. The apparatus includes a normally closed, weight operated valve which opens a preset delay after the weight operated valve is subjected to sufficient weight such as when a test string is set down upon, and supported by, a packer isolating an underground formation; and a normally open, weight and pressure operated valve which closes immediately when the test string is set down upon the packer. The weight and pressure operated valve expands a sealed chamber when subjected to sufficient weight to close its associated valve. The weight and pressure operated valve also includes a pressure responsive piston which opens and closes the valve, and which is responsive to the pressure in the sealed chamber, and to fluid pressure in the well annulus.