Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1992-04-14
1993-08-10
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166 53, 166 64, 166 651, 166 664, 166373, 166264, 364422, E21B 3410, E21B 3414, E21B 4312, E21B 4908
Patent
active
052340570
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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Beck Harold K.
Bohan William L.
Schultz Roger L.
Zitterich Craig L.
Halliburton Company
Novosad Stephen J.
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