Patent ID: 8695697
Filing Date: 2014-04-15
Classification: E21B

Abstract:
1. A downhole tool for use in a borehole annulus, the tool comprising: a mandrel; a first packing element disposed on the mandrel; a portion of the tool on one side of the first packing element defining at least one first external port exposed to the borehole annulus; a first piston element disposed on the mandrel adjacent an opposite side of the first packing element and defining a second external port exposed to the borehole annulus, the second external port communicable with the at least one first external port via a first fluid path passing between the first packing element and mandrel, the first piston element being movable to compress the first packing element; and a first valve element disposed on the first piston element and being activatable from a first condition to a second condition, the first valve element in the first condition allowing fluid communication between the at least one first external port and the second external port, the first valve element in the second condition preventing fluid communication between the at least one first external port and the second external port.