Drill Collar Severing Tool

摘要

A pipe severing tool is arranged to align a plurality of high explosive pellets along a unitizing central tube that is selectively separable from a tubular external housing. The pellets are loaded serially in a column in full view along the entire column as a final charging task. Detonation boosters are pre-positioned and connected to detonation cord for simultaneous detonation at opposite ends of the explosive column. Devoid of high explosive pellets during transport, the assembly may be transported with all boosters and detonation cord connected.

主权项

1. An apparatus for explosively severing a length of pipe comprising:
a tubular housing comprising an interior barrel between opposite distal ends of the tubular housing, wherein the interior barrel comprises a first diameter; first and second end plugs for environmentally sealing the interior barrel; an interior tube having a first end, a second end, and a second diameter, wherein the second diameter is less than the first diameter, and wherein the first end is secured to the first end plug and extends therefrom along an axis of the tubular housing therefrom; a selectively removable terminus secured to the second end of the interior tube; a selectively positionable partition secured to the interior tube between the terminus and the first end plug; a first booster explosive secured within the interior tube proximate to the first end; a second booster explosive secured within the interior tube proximate to the opposite end; a third booster explosive secured within the selectively positionable partition; and a first detonation cord and a second detonation cord, wherein the first detonation cord connects the first booster explosive and the second booster explosive, wherein the second detonation cord connects the first booster explosive and the third booster explosive, and wherein the first detonation cord and the second detonation cord are of substantially the same length.