Shut-in tools

Details Shut-in tools Shut-in tools

1993-05-27

1994-07-26

Novosad, Stephen J.

Wells

Automatic

166 64, 166 651, 166 664, 166250, 166264, 364422, E21B 4706, E21B 4312, E21B 3410, E21B 4908

Patent

active

053320352

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.
Exhibit B-Brochure entitled "The Omega Shut In Tool" of Omega Developing & Engineering, Ltd. (Undated and not admitted to be prior art).

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