Downhole circulation valve operated by dropping balls

Details Downhole circulation valve operated by dropping balls Downhole circulation valve operated by dropping balls

2006-06-06

2006-06-06

Bagnell, David (Department: 3672)

Wells

Valves, closures or changeable restrictors

Operated by dropped element

C166S317000, C166S386000

Reexamination Certificate

active

07055605

ABSTRACT:
A downhole tool (10) for selectively circulating fluid in a borehole is disclosed. The tool operates via the use of a combination of deformable drop balls (36) and smaller hard drop balls (40). In use a deformable drop ball (36) moves a sleeve (20) exposing a radial port (30,32) to provide fluid circulation radially from the tool. The smaller drop ball (40) can then obstruct the radial port (32,30) and by the increased pressure the deformable drop ball (36) is extruded through the tool. The resulting pressure differential as the drop ball (36) moves causes the sleeve (20) to rise, releasing the smaller drop (40) ball and closing the radial port (32,30). The process can be repeated to selectively circulate fluid through the tool.

REFERENCES:
patent: 3054415 (1962-09-01), Baker et al.
patent: 5499487 (1996-03-01), McGill
patent: 5499687 (1996-03-01), Lee
patent: 5533571 (1996-07-01), Surjaatmadja et al.
patent: 2268770 (1994-01-01), None
patent: 2341405 (2000-03-01), None
patent: WO/2001/90529 (2001-11-01), None

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