Patent ID: 9435170
Filing Date: 2016-09-06
CPC Classification: E21B

Claim Text:
1. An apparatus for severing a length of pipe comprising: a tubular housing having an internal bore and a plurality of bi-directional boosters; one or more vents in said tubular housing to substantially equalize fluid pressure within said internal bore with fluid pressure outside of said tubular housing; a first detonation cord having a first length between a first bi-directional booster and a second bi-directional booster of said plurality of bi-directional boosters; a second detonation cord having a first length between a third bi-directional booster and a fourth bidirectional booster of said plurality of bi-directional boosters; a main load explosive material in said tubular housing located between said second bi-directional booster and said fourth bi-directional booster of said plurality of bi-directional boosters; a fluid impermeable material mixed with said main load explosive material; and an initiating booster explosive for simultaneously initiating said first bi-directional booster and said third bi-directional booster of said plurality of-bidirectional boosters.