Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
2000-11-09
2003-07-01
Bagnell, David (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
C166S321000, C166S386000, C175S243000
Reexamination Certificate
active
06585048
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATED REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a wellbore system comprising a borehole formed in the earth formation, the borehole being provided with a valve having a passage for a stream of fluid flowing from an upstream side of the valve to a downstream side of the valve. In the practice of production of hydrocarbon fluid from a wellbore valves are generally applied to control the flow rate of the produced fluid or to shut off the wellbore in case of an emergency. Such valves generally allow flow of fluid through the borehole in both directions thereof.
It is an object of the invention to provide a wellbore system comprising a borehole formed in the earth formation, the borehole being provided with a valve allowing flow of fluid in one direction through the borehole and preventing flow of fluid in the other direction through the borehole.
BRIEF SUMMARY OF THE INVENTION
In accordance with the invention there is provided a wellbore system comprising a borehole formed in the earth formation, the borehole being provided with a valve having a passage for a stream of fluid flowing from an upstream side of the valve to a downstream side of the valve, a closure member exposed to a drag force exerted by the stream and movable relative to the passage between an open position in which the closure member allows fluid to flow through the passage and a closed position in which the closure member closes the passage, said drag force biasing the closure member to the open position thereof, and a spring exerting a spring force to the closure member biasing the closure member to the closed position, wherein the spring force when the closure member is in the closed position exceeds a selected lower limit of the drag force.
Suitably the valve is oriented in the borehole in a manner that the closure member is biased to the open position thereof by the drag force exerted by the stream pumped through the borehole in downward direction thereof.
Preferably the valve is oriented in the borehole in a manner that the closure member is biased to the open position thereof by the drag force exerted by the stream flowing through the borehole in upward direction thereof.
REFERENCES:
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patent: 4749044 (1988-06-01), Skipper et al.
patent: 5293905 (1994-03-01), Friedrich
patent: 5465787 (1995-11-01), Roth
patent: 5655607 (1997-08-01), Mellemstrand et al.
patent: 5680902 (1997-10-01), Giroux et al.
patent: 5690177 (1997-11-01), Budde
patent: 5947206 (1999-09-01), McCalvin et al.
patent: 5957207 (1999-09-01), Schnatzmeyer
patent: 5992524 (1999-11-01), Graham
patent: 6152224 (2000-11-01), French
patent: 6283217 (2001-09-01), Deaton
patent: 6349771 (2002-02-01), Luke
International Search Report dated Feb. 13, 2001.
Bagnell David
Gay Jennifer H
Shell Oil Company
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