Ball seat with controlled releasing pressure and method setting

Details Ball seat with controlled releasing pressure and method setting Ball seat with controlled releasing pressure and method setting

1999-05-03

2000-12-05

Bagnell, David

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166317, 166318, F21B 3410

Patent

active

061553506

ABSTRACT:
An improved ball seat is described for downhole use. The ball seat can be held in place by one or more shear pins or other fixation devices or by the nature of assembly. A breakable device, such as a rupture disc, is in communication above the ball and with an enlarged piston area below. When the breakable member or rupture disc breaks, the applied pressure is translated to a far larger piston area, and the shear rating of the shear pin or pins is almost instantaneously overcome. Thus, the pressure at which the ball seat releases is determined by the design and rating of the breakable member or rupture disc. The cavity behind the breakable member is preferably grease-filled with a small weep hole to avoid trapping pressure during assembly.

REFERENCES:
patent: 4096913 (1978-06-01), Kenneday et al.
patent: 4099563 (1978-07-01), Hutchinson et al.
patent: 4427070 (1984-01-01), O'Brien
patent: 4674569 (1987-06-01), Revils et al.
patent: 4693314 (1987-09-01), Wesson et al.
patent: 5318118 (1994-06-01), Duell
patent: 5392862 (1995-02-01), Swearingen
patent: 5411095 (1995-05-01), Ehlinger et al.
patent: 5499687 (1996-03-01), Lee
patent: 5782304 (1998-07-01), Garcia-Soule et al.
patent: 5819853 (1998-10-01), Patal

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