Well tool control system and method

Details Well tool control system and method Well tool control system and method

1988-09-12

1989-08-15

Novosad, Stephen J.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166 53, 166 64, 166264, 166319, E21B 3410, E21B 3416, E21B 4706, E21B 4908

Patent

active

048565954

ABSTRACT:
In accordance with illustrative embodiments disclosed herein, a formation testing tool suspended in a well on a pipe string includes a valve actuator control system which responds to a command signal having a certain signature. The command signal is applied at the surface to the well annulus, and includes a series of two or more low level pressure pulses which are detected at the downhole tool, each pressure pulse having, for example, a certain peak value which lasts for a certain time. On detection of the command signal, a control system within the testing tool permits selective application of hydrostatic pressure which forces the valve actuator to shift from one position to another, thereby to open or close an associated valve element.

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patent: 4596516 (1986-06-01), Scott et al.
patent: 4618000 (1986-10-01), Burris, II
patent: 4712613 (1987-12-01), Nieuwstad

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