B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
121/30
B25D 9/02 (2006.01) E21B 4/14 (2006.01) E21B 21/12 (2006.01)
Patent
CA 1037797
ABSTRACT OF THE DISCLOSURE A rotatable airhammer includes an outer housing structure in which a hollow hammer piston is reciprocable to impact against an anvil bit used in drilling a bore hole. The anvil bit has a central passage communicating with inner core sample tubing extend- ing through the piston to the upper end of the housing structure, such tubing housing structure being connectible to a string of concentric dual drill pipe extending to the top of the bore hole. Compressed air is directed alternately to the annular space between the tubing and housing structure above and below the piston to reciprocate the latter for repeated impact action against the anvil bit, air being discharged from the lower portion of the housing structure to clear the bottom of the bore hole of cuttings and direct them into the central passage through the bit, the inner tubing and inner drill pipe portion to the top of the hole. A gauge sleeve is mounted on the housing structure a short dist- ance above the lower end of the anvil bit, exhaust air from the air-hammer being directed into the bore hole immediately above and below the sleeve to provide a static air seal preventing cut- tings from passing upwardly around the sleeve, insuring passage of all cuttings into the central bit passage. Exhaust air is also directed into the bore hole at a distance above the gauge sleeve to blow bore hole debris externally of the housing structure and drill pipe upwardly through the annulus around the drill pipe to the top of the bore hole.
249739
Bakerdrill
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