In-the-hole drill inner tube rod

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

E - Fixed Constructions

21

B

E21B 17/00 (2006.01)

Patent

CA 2078035

IN-THE-HOLE DRILL INNER TUBE ROD PC-3199 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 necessary 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.

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