E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/43
E21B 4/00 (2006.01) E21B 34/10 (2006.01) E21B 47/00 (2006.01) E21B 49/00 (2006.01) E21B 49/08 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1036489
ABSTRACT OF THE DISCLOSURE In a well testing tool having a spring whose biasing force is supplemented by the hydrostatic pressure in the well annulus at the testing depth, a method and apparatus for isolating the spring from the pressure in the well annulus utilizing the pres- sure differential between the well annulus and the testing tool bore which exists after the formation is isolated and for main- taining the isolation of the spring force during subsequent in- terior bore pressure increases such as during formation treating operations. An isolation valve is provided whose closing force is generated by isolating the testing tool bore from the well annulus, and then increasing the well annulus pressure above the hydrostatic pressure. The pressure differential thus created is utilized to close the valve. Uni-directional acting means is provided in the isolation valve responsive to the interior bore pressure such that when the interior bore pressure is increased subsequent to the closing of the isolation valve, the uni- directional acting means will not cause the isolating valve to reopen, but will nullify the effect of the subsequent pressure increase such that the valve will remain closed. The opening force is provided by compressing a spring when the valve is closed, thus allowing the isolation valve to reopen when the pres- sure in the annulus is returned to hydrostatic. An isolation valve is provided which is normally open, which closes only after the well annulus pressure exceeds a reference pressure trapped in the bore of the testing tool by a predetermined amount, and which remains closed during subsequent pressure increases in the bore of the testing tool. -1-
243948
Barrington Burchus Q.
Farley David L.
LandOfFree
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