DEVICES AND RELATED METHODS FOR ACTUATING WELLBORE TOOLS WITH A PRESSURIZED GAS

摘要

An apparatus for activating a wellbore tool includes a cylinder, a shaft, and a pressure dissipater. The cylinder has a first inner surface defining a smooth bore section and a second inner surface adjacent to the first inner surface. The shaft has a piston section that includes at least one seal forming a fluid seal with the first inner surface when the seal is at a nominal diameter. The pressure dissipater is formed along the second inner surface of the cylinder, the pressure dissipater contacts and physically destabilizes the at least one seal after the at least one seal exits the smooth bore section.

主权项

1. A well tool, comprising:
an upper sub having a housing that includes a first chamber for receiving an igniter, the igniter generating a flame output when detonated; a pressure sub having:
a cylinder having an inner surface defining a bore, the cylinder bore having:
a smooth bore section defined by an inner surface that is dimensionally non-varying both circumferentially and axially, anda pressure chamber that generates the pressure needed to displace the cylinder in a direction away from the upper sub, anda shaft disposed in the cylinder bore, the shaft having a bore, a first end connected to the upper sub, and a second end on which a piston assembly is formed, the piston assembly including at least one seal contacting the inner surface of the cylinder,a power charge disposed in the shaft bore, the power charge being formed of an energetic material that generates a gas when ignited by the flame output of the igniter, anda pressure dissipater formed at a terminal end of the cylinder, the pressure dissipater contacting and physically destabilizing the at least one seal after the at least one seal exits the smooth bore section; and a lower sub connected to the cylinder and configured to axially displaces a component of the separate wellbore device.