E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 3/00 (2006.01) B23B 41/00 (2006.01) B23B 47/34 (2006.01) E02D 17/13 (2006.01) E02F 3/20 (2006.01) E02F 3/88 (2006.01) E02F 3/92 (2006.01) E21B 7/18 (2006.01)
Patent
CA 2487460
A drilling machine comprising: ~ a frame ; ~ at least one pair of rotary drilling tools having substantially the same axis of rotation; and ~ a support assembly (32) secured to the frame and supporting said pair of tools in rotation, said support assembly presenting an edge (32a) facing the cutting face and extending between the tools of said pair of tools, said machine being characterized in that it further comprises: ~ means (54) mounted on said support assembly for creating at least one jet of liquid at very high pressure directed towards the cutting face between the action zones of said pair of tools; whereby said jet of liquid at very high pressure breaks up the ridge which forms in the cutting face between the action zones of said pair of rotary tools.
Compagnie Du Sol
Mccarthy Tetrault Llp
LandOfFree
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