1993-05-27
1994-01-18
Novosad, Stephen J.
Wells
Automatic
166 64, 166 664, 166 651, 166264, E21B 4312, E21B 4908
Patent
active
052793630
ABSTRACT:
A downhole shut-in tool includes in one aspect a pilot valve which when opened places a differential pressure across a piston which in turn operably engages a shut-in valve element to close the shut-in tool. An electronic timer assembly and electric drive motor are provided for controlling the action of the pilot valve. The drive motor is controlled by a load sensor which senses that the motor has stalled when an actuator engages a movement limiting abutment. In another aspect a pilot valve is provided which can selectively communicate the pressure differential across the piston so as to repeatedly open and close the shut-in valve element. Efficient methods of drawdown and buildup testing using such an automated multiple operating shut-in tool are provided. Associated automated sampling tools are also disclosed.
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Exhibit A--"Otis Products and Services" catalog, published by Otis Engineering Corporation of Dallas, Tex., pp. 92-103, Sep. 1989.
Beck Harold K.
Bohan William L.
Schultz Roger L.
Zitterich Craig L.
Druce Tracy W.
Halliburton Company
Novosad Stephen J.
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