Halliburton Company

Halliburton Services

Gerald D Jackson

Burchus Q Barrington

Michael E McMahan

John C Zimmerman

Jim R Williamson

Wilbur P Clayton

A screw operated emergency release and safety valve includes a valve housing having a flow passage therethrough and adapted to be connected to a lower portion of a tubing string. A full opening ball valve is disposed in the valve housing for opening and closing the flow passage. A stinger assembly is adapted to be connected to an upper portion of the tubing string, and includes a stinger mandrel releasably telescopingly received within the valve housing. An actuating mandrel assembly is operably associated with the stinger mandrel and connected to the ball valve and is movable between first and second positions for opening and closing the ball valve in response to manipulation of the upper portion of the tubing string. A threaded connecting collar releasably interconnects the valve housing and the stinger assembly. The valve housing, ball valve, stinger assembly, actuating mandrel assembly and threaded connecting collar are so arranged and constructed that, when disconnecting the threaded connecting collar, a first predetermined number of rotations of the stinger assembly in a right-hand direction relative to the valve housing causes the actuating mandrel assembly to move to its said second position thereby closing the ball valve, and an additional predetermined number of rotations of the stinger assembly in the right-hand direction relative to the valve housing is necessary to release the stinger assembly from the valve housing. Methods of use are also disclosed.

Screw operated emergency relief and safety valve

A drill pipe tester valve includes a spherical valve member supported from an upward facing surface of a housing so that downward forces exerted on the valve member in its closed position, due to fluid pressure in a string of pipe above the valve member, are transmitted substantially entirely to said housing. A latching device is provided for latching the spherical valve member in its closed position as the string of pipe and tester valve are lowered into a well and for subsequently releasing the spherical valve member and allowing it to move to its open position when the string of pipe and tester valve are finally positioned within the well.

Drill pipe tester and safety valve

Disclosed is a tester valve having a ball valve rotatable between the open and closed positions for use with a test string to test an oil well. The apparatus includes a ball closing piston in the valve operating mechanism which assists in rotating the ball to the closed position. One side of the ball closing piston is exposed to a first pressure of formation fluid flowing through the interior of the test string on the upstream side of the ball valve. The other side of the piston is exposed to a second pressure which is lower than the first pressure by a pressure drop caused as the fluid flows through the apparatus past the ball being rotated to the closed position. A bypass mechanism is additionally disclosed which is operable for equalizing the pressure on both sides of the ball closing piston when the ball is being rotated to the open position.

Growing community of inventors

Marlow, OK, United States of America

Gerald D Jackson