Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
2007-01-30
2007-01-30
Bagnell, David (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
C166S323000, C166S325000, C166S331000, C166S332800
Reexamination Certificate
active
10550917
ABSTRACT:
The invention relates to downhole wellbore apparatus and particularly, but not exclusively, to apparatus for use in wellbore cleaning operations. A downhole tool (2) comprises a body (4) having a bore extending longitudinally therethrough, wherein the tool (2) further comprises a one-way valve (24,26) for allowing a flow of fluid in a first direction through the tool bore and preventing a flow of fluid in a second direction through the tool bore, the second direction being opposite to the first direction. The tool further comprises mandrel (38) for rendering the one-way valve (24,26) inoperable so as to be ineffective at preventing fluid flow; and a shear pin assembly (44,40) for selectively making the one-way valve operable so as to be effective at allowing fluid flow in the first direction and preventing fluid flow in the second direction.
REFERENCES:
patent: 3826309 (1974-07-01), Tausch
patent: 4185690 (1980-01-01), Kinney
patent: 4291722 (1981-09-01), Churchmon
patent: 4378842 (1983-04-01), Patel
patent: 4393930 (1983-07-01), Ross et al.
patent: 4474241 (1984-10-01), Freeman
patent: 4574889 (1986-03-01), Pringle
patent: 4577694 (1986-03-01), Brakhage
patent: 4615394 (1986-10-01), Kuhlman, Jr.
patent: 4791991 (1988-12-01), Morris et al.
patent: 4834183 (1989-05-01), Vizant et al.
patent: 5327960 (1994-07-01), Cornette et al.
patent: 5415237 (1995-05-01), Strattan
patent: 5636661 (1997-06-01), Moyes
patent: 6209663 (2001-04-01), Hosie
Laplante Tony
McGarian Bruce
Bagnell David
Dykema Gossett PLLC
Fuller Robert
Smith International Inc.
LandOfFree
Wellbore annulus flushing valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wellbore annulus flushing valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wellbore annulus flushing valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3770624