Patent ID: 7549480
Filing Date: 2009-06-23
Classification: E21B

Abstract:
1. A device for performing a downhole operation in a wellbore formed into an earth formation, the device comprising: an actuator movable from a first configuration to a second configuration by the presence of a selected hydraulic fluid pressure in the wellbore acting on the exterior of the actuator, the actuator being prevented from movement until the pressure in the wellbore equals the selected hydraulic fluid pressure; and a tool arranged to be moved by the actuator so as to perform said downhole operation upon movement of the actuator from the first configuration to the second configuration thereof, wherein the actuator is arranged to be released from the first configuration when the hydraulic pressure in the wellbore equals the selected pressure; wherein the device is a device for expanding a tubular element in the wellbore and the tool is an expander arranged to be moved axially through the tubular element by the actuator upon movement of the actuator from the first configuration to the second configuration thereof.