Patent ID: 7011153
Filing Date: 2006-03-14
Classification: E21B

Abstract:
1. A disconnect tool for use in a subterranean well, comprising: a first housing releasably connected to a second housing, the second housing having a circulation port and an inner bore therethrough; a first piston releasably connected to the first housing, and having an inner bore therethrough and an upper ball seat; and a second piston releasably connected to the second housing and having an inner bore therethrough and a lower ball seat, the lower ball seat having a diameter less than a diameter of the upper ball seat, the second piston having a run-in circulation port, an inflation port, and a secondary circulation port, the run-in circulation port being in fluid communication with the circulation port in the second housing before a lower ball is engaged with the lower ball seat, the inflation port directing fluid flow from the inner bore of the first piston to a portion of the inner bore of the second housing below the lower ball seat when the lower ball is engaged with the lower ball seat, and the secondary circulation port being in fluid communication with the circulation port in the second housing after the second piston is disconnected from the second housing, the first piston being disconnected from the first housing after an upper ball is engaged with the upper ball seat to thereby disconnect the first housing from the second housing.