In-the-hole drill inner tube rod

Details In-the-hole drill inner tube rod In-the-hole drill inner tube rod

1991-09-13

1992-12-29

Neuder, William P.

Boring or penetrating the earth

With tool shaft detail

E21B 1716

Patent

active

051743957

ABSTRACT:
A drill rod having an inner tube extending through the rod. The rod and the tube form a dead zone that reduces the time necesssary to compress air within the rod. By presenting a smaller internal cross-sectional flow area within the rod and, as a consequence throughout the drill string, the drill hammer disposed at the bottom of the hole will operate more efficiently.

REFERENCES:
patent: 2958512 (1960-11-01), Humphrey
patent: 3047313 (1962-07-01), Bruce
patent: 4872519 (1989-10-01), Kopecki

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