Pressure apportioning valve apparatus for use with multiple packers
AssigneeSchlumberger Technology Corporation
InventorJames M. Upchurch
Life of this patent
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Abstract
In accordance with an illustrative embodiment of the present invention, a valve apparatus adapted for use in drill stem testing to apportion a pressure differential across two vertically spaced packers includes a housing mounted between the packers and having a flow passage leading from the exterior to the interior thereof, a first valve means including a spring-loaded mandrel arranged to close the passage at a preselected difference in pressures inside and outside the housing, and a second valve means that also can close the passage after a measured quantity of fluids has flowed through the passage.
Claims15
Apparatus for use in apportioning a pressure differential to spaced packers adapted to seal off the annulus between a pipe string and a well conduit wall, comprising:
- a tubular housing adapted to be connected between spaced packers, said housing having a flow passage leading from the exterior to the interior thereof;
- a valve mandrel sealingly slidable and movable longitudinally within said housing between first and second positions;
- valve means on said mandrel and said housing enabling a flow of fluid from the exterior to the interior of said housing in said second position and blocking said flow in said first position;
- said mandrel having a stepped outer diameter providing first transverse surface means subject to the pressure of fluids externally of said housing and second resultant transverse surface means subject to the pressure of fluids internally of said housing;
- and bias means for applying bias force to said mandrel that acts to move said mandrel to said first position at a predetermined difference in the pressure of fluids acting on said surface means.
Apparatus for use in apportioning a pressure drop to spaced packers adapted to seal off the annulus between a pipe string and a well conduit wall, comprising:
- housing means adapted to be connected between spaced packers and having a fluid passage leading from the exterior to the interior thereof;
- first valve means for closing said passage at a preselected differential in pressures externally and internally of said housing means;
- and second valve means for automatically closing said passage after a measured quantity of fluids has passed via said passage from the exterior to the interior of said housing means.
Dependencies are inferred from the claim text.