Importance

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Abstract

A pull release apparatus is provided for use in a wellbore when coupled between a fluid-actuated wellbore tool and a retrievable source of pressurized fluid. The pull release, fluid-actuated tool, and source of pressurized fluid are positioned in the wellbore by a positioning member, such as a wireline or a work string. A central fluid conduit is defined within the pull release device, and is adapted for receiving pressurized fluid from the source of pressurized fluid, and for directing the pressurized fluid to the fluid-actuated wellbore tool. A first latch is provided, which is operable in latched and unlatched positions. The first latch mechanically links the source of pressurized fluid to the fluid-actuated wellbore tool which unlatches the source of pressurized fluid from the fluid-actuated wellbore tool in response to axial force of a first preselected magnitude. A lock is provided which is operable in locked and unlocked positions. When in the locked position, the lock prevents the first latch from unlatching until pressurized fluid is supplied to the central fluid conduit at a preselected pressure level. A second latch is provided, and is operable in latched and unlatched positions. The second latch operates to mechanically link the source of pressurized fluid to the fluid-actuated wellbore tool. The second latch unlatches the source of pressurized fluid from the fluid-actuated wellbore tool in response to axial force of a second preselected magnitude, greater than the first preselected magnitude, which is applied through the positioning member.

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First Claim