Dual action valve including a built in hydraulic circuit

Details Dual action valve including a built in hydraulic circuit Dual action valve including a built in hydraulic circuit

1996-06-18

1998-10-27

Tsay, Frank

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166319, E21B 3410

Patent

active

058266607

ABSTRACT:
A valve for use downhole in a wellbore can be repeatedly opened and closed any number of times in response to a pressure signal transmitted down the annulus of the wellbore. The valve is set and changes from a first position to a second position in response to a first pressure signal transmitted down the annulus, a pressure value of the first pressure signal transmitted down the annulus being greater than a pressure value of a pressure existing in an inside annular space of the valve by an amount at least equal to a predetermined value. The valve resets itself and changes back from the second position to the first position in response to a second pressure signal transmitted down the annulus, the pressure value of the pressure existing in the inside annular space of the valve being greater than a pressure value of the second pressure signal transmitted down the annulus by an amount at least equal to the predetermined value.

REFERENCES:
patent: 2951536 (1960-09-01), Garrett
patent: 3554281 (1971-01-01), Ecuer
patent: 4109725 (1978-08-01), Williamson et al.
patent: 4234043 (1980-11-01), Roberts
patent: 4324293 (1982-04-01), Hushbeck
patent: 4325409 (1982-04-01), Roberts
patent: 4325434 (1982-04-01), Roberts
patent: 4403659 (1983-09-01), Upchurch
patent: 4617999 (1986-10-01), Beck
patent: 4736798 (1988-04-01), Zunkel
patent: 4817723 (1989-04-01), Ringgenberg
patent: 4907655 (1990-03-01), Hromas et al.
patent: 4979569 (1990-12-01), Anyan et al.

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