E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/43
E21B 4/00 (2006.01) E21B 33/12 (2006.01) E21B 47/06 (2006.01)
Patent
CA 1038748
ABSTRACT OF THE DISCLOSURE An apparatus, to be used in conjunction with an oil well tool operable for closing-in, testing and treating a well formation, and having a bore therethrough and a spring biasing means whose spring force is increased responsive to an increase in fluid pressure external to the tool. The apparatus has valve means, in the wall of said tool, movable from an open position, wherein increases in said external fluid pressure increases the spring force of said spring biasing means, to a closed position, wherein increases in said external fluid pres- sure are isolated from said spring biasing means. Pressure responsive means is connected to the valve means for moving the valve means from the open position to the closed position re- sponsive to an increase in the pressure external to the tool a predetermined amount above the pressure in the well adjacent said closed-in formation. The improvement comprises means, coacting with the pressure responsive means, for maintaining the valve means in the closed position responsive to increases in the pressure in the well adjacent said formation subsequent to the closing of the valve means.
295916
Barrington Burchus Q.
Farley David L.
Company Halliburton
Na
LandOfFree
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