Down-hole tools

Details Down-hole tools Down-hole tools

1995-05-18

1997-09-09

Tsay, Frank

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166321, E21B 3410

Patent

active

056646291

ABSTRACT:
A time delay mechanism wherein there is provided a time delay between the application of a pressure to the mechanism and an action being carried out as a result of the application of said pressure. The mechanism may comprise a first piston and piston chamber and a second piston and piston chamber. Communication of a viscous fluid between said piston chambers may be achieved by means of at least one contoured flow passage.

REFERENCES:
patent: 3794112 (1974-02-01), Hill
patent: 4083409 (1978-04-01), Barrington
patent: 4448254 (1984-05-01), Barrington
patent: 4617999 (1986-10-01), Beck
patent: 4646838 (1987-03-01), Manke
patent: 4691779 (1987-09-01), McMahan et al.
patent: 4770246 (1988-09-01), Ward
patent: 5050681 (1991-09-01), Skinner
patent: 5058673 (1991-10-01), Muller et al.
patent: 5180007 (1993-01-01), Manke et al.
patent: 5209303 (1993-05-01), Barrington
patent: 5518073 (1996-05-01), Manke et al.

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