Patent ID: 6823945
Filing Date: 2004-11-30
Classification: E21B

Abstract:
An apparatus for opposing forces acting on a mandrel of a downhole tool, the downhole tool deployed in a wellbore on a tubing having a bore therein, the apparatus comprising:a piston housing having a cavity therein; a piston disposed and axially movable within said cavity, said piston associated with a piston carrier, said piston carrier having a passage therein in fluid communication with the tubing bore; said piston engageable with the mandrel so that forces acting on said piston may be transferred to the mandrel; and at least port disposed in said piston carrier, said at least one port allowing fluid communication between the tubing bore and said cavity; wherein the downhole tool is a packer having at least one shear element carried on the mandrel, whereby forces transferred from said piston to the mandrel are applied to the shear element.