Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
1999-11-24
2001-11-06
Tsay, Frank S. (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
C166S332100
Reexamination Certificate
active
06311777
ABSTRACT:
The present invention relates to well logging tools and more particularly to well logging tools which can be battery operated allowing free movement of the tool. The tool could, however, be more conventionally employed with connecting cable.
It is an object of the present invention to provide a well logging tool which includes means for allowing passage of fluid through the tool.
The present invention provides a well logging tool, including a fluid flow unit, said fluid flow unit including differential pressure valve means, said differential pressure valve means comprising means for allowing passage of fluid from a first inlet grille means to a second outlet grille means.
In a preferred embodiment the differential pressure valve means is bi directional allowing passage of fluid through said fluid flow unit in two directions.
Preferably the well logging tool comprises a first, in use, upper section comprising said fluid flow unit and a second in use lower section comprising a logging data section securely attached in longitudinal alignment to said first section. Preferably said tool and second sections comprise generally elongate cylindrical sections.
Preferably said first section comprises at least one enlarged portion, having a diameter larger than the diameter of the second section. In a preferred embodiment the first section includes two enlarged portions, spaced apart on the length of the first section.
Preferably said grilles are situated on a smaller diameter portion of said first section to thereby allow free passage of said fluid past the logging tool.
Preferably said differential pressure means comprises a piston slideably mounted in a cylinder. Said piston is spring biased towards a normally closed valve position to prevent passage of fluid through said cylinder.
Preferably said piston is movable within the cylinder in two directions to enable fluid paths to be open allowing passage of fluid in a first and a second direction.
In use said first and second directions respectively comprise passage of fluid down a drillpipe and upwardly within said drillpipe.
REFERENCES:
patent: 3692106 (1972-09-01), Basham et al.
patent: 4041780 (1977-08-01), Angehrn
patent: 4386422 (1983-05-01), Mumby et al.
patent: 4553599 (1985-11-01), Glotin
patent: 5095983 (1992-03-01), Magnani
patent: 5099919 (1992-03-01), Schneider et al.
patent: 5117685 (1992-06-01), Goldschild
patent: 5209304 (1993-05-01), Nice
patent: 5404946 (1995-04-01), Hess
patent: 2232177 A (1989-05-01), None
Milne Alex Watson
Spencer Michael Charles
Paul & Paul
Reeves Wireline Technologies Ltd.
Tsay Frank S.
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