| CPC E21B 29/02 (2013.01) [E21B 43/1185 (2013.01)] | 18 Claims |
|
1. A tool for manipulating a target with combustion products from a propellant, wherein the propellant is a generally explosive material which has a low rate of combustion and once ignited produces propellant gas via at least one of burning, decomposing, or deflagrating, the tool comprising:
a housing comprising at least one outlet for combustion products from at least one propellant source contained within the housing;
an ignition mechanism for igniting the propellant at the propellant source;
wherein the outlet comprises a plurality of exit ports on a surface of the tool configured, when open, to direct combustion products at a target;
the plurality of exit ports comprising a principal exit port and one or more secondary exit ports, the secondary exit port or ports being spaced apart from and at least partly surrounding the principal exit port, wherein the secondary exit port or ports are arranged relative to the principal exit port such that, in use of the tool, a jet or jets of combustion products emanating from the secondary exit port or ports substantially surround or surround, thereby shrouding, a jet of combustion products emanating from the principal exit port, wherein the plurality of exit ports are sealed, before use by a fusible material, such that after ignition the fusible material is melted by heat generated, thereby opening the exit ports.
|