Nl Industries

Stewart & Stevenson Oiltools, Inc.

Bill M Brock, Jr

Norman A Nelson

Leo Jude Marquette

A tubing hanger supported in a wellhead and in turn supporting tubing therefrom, and having an upper end adapted to be engaged by a Christmas tree. The hanger includes an annulus control passageway extending between the annulus between the tubing and casing and the Christmas tree and includes one or more safety valve control passageways for controlling subsurface safety valves. Valves are connected to each of the passageways for opening and closing the passageways with springs urging the valves to a closed position whereby the passageways will be closed when the tubing hanger is installed so that the well is completely closed when the tubing hanger is landed. The valves are exposed to the exterior of the hanger whereby the valves may be actuated to an open position by mechanical and/or hydraulic controls connected to the Christmas tree.

Tubing hanger with fail-safe control passageway

A method of and apparatus for measuring and monitoring the annulus pressure between coaxial well conduits by providing a pressure measuring means which is adapted to be positioned in the well in the annulus and which is movable in response to pressure, and measuring means measuring the movement of the movable pressure measuring means, and transmitting the measurement to the well surface. Pressure measuring means may include a movable element exposed to the pressure in the annulus and a pressure charge chamber acting on the element opposing the movement caused by the pressure in the annulus. The pressure chamber and movable elements may be annular and surround the exterior of the interior conduit. The measuring means includes sensor means adapted to be moved in the well in the interior of the interior conduit to a position adjacent but spaced from the pressure measuring means for providing measurements by signal waves. The measuring means may include a stop shoulder for location the measuring means at a predetermined location in the interior conduit.

Growing community of inventors

Stafford, TX, United States of America

Bill M Brock, Jr