Patent ID: 8393401
Filing Date: 2013-03-12
Classification: E21B

Abstract:
1. A liner hanger running tool to position a liner within a casing in a wellbore, comprising: a tool mandrel having a throughbore and supported on a running string; a piston mandrel surrounding the tool mandrel; a piston housing surrounding the piston mandrel; the liner circumferentially surrounding at least a portion of the piston mandrel; a flow annulus having a radially inner surface defined in part by an outer surface of the tool mandrel and having a radially outer surface defined in part by an inner surface of the piston mandrel, the flow annulus having an annular cross-sectional configuration defining a flow path for fluid entering the flow annulus from an annulus exterior of the running tool and passing upwards through the running tool to a position above the liner and in fluid communication with the annulus exterior of the running tool and interior of the casing, the fluid passing in the flow annulus upward through the running tool while the running tool and liner are lowered in the wellbore; and a hydraulic release mechanism activated by fluid pressure within the tool mandrel to axially move a piston positioned radially outward of the piston mandrel to release the running tool from the liner.