Propellant back off tool

摘要

An apparatus includes a propellant chamber, an expansion chamber, an exit chamber comprising a port providing fluid communication outside the apparatus, and a longitudinal acceleration chamber. The longitudinal acceleration chamber includes a first end in fluid communication with the propellant chamber, a second end in fluid communication with the expansion chamber, and a longitudinal axis between the first end and the second end. An acceleration mass is slidably contained in the acceleration chamber. The acceleration chamber includes a propellant side between the propellant chamber and the acceleration mass, and a target side between the acceleration mass and the expansion chamber. A transfer piston is slidably positioned between the expansion chamber and the exit chamber. The transfer piston includes a first end projecting into the expansion chamber and aligned with the longitudinal axis of the acceleration chamber, and a second end projecting into the exit chamber.

主权项

1. An apparatus comprising:
a pipe back off tool having:
a propellant chamber;an expansion chamber;an exit chamber comprising a port providing fluid communication outside the apparatus;a longitudinal acceleration chamber having:
a first end in fluid communication with the propellant chamber,a second end in fluid communication with the expansion chamber, anda longitudinal axis between the first end and the second end;an acceleration mass slidably contained in the acceleration chamber, wherein the acceleration chamber has:
a propellant sub-chamber between the propellant chamber and the acceleration mass, anda target sub-chamber between the acceleration mass and the expansion chamber;a transfer piston slidably positioned between the expansion chamber and the exit chamber, the transfer piston having:
a first end projecting into the expansion chamber and aligned with the longitudinal axis of the acceleration chamber wherein the first end of the transfer piston is separated from the acceleration mass prior to operation, anda second end projecting into the exit chamber.