Blade-equipped drilling tool, incorporating secondary cutting ed

Details Blade-equipped drilling tool, incorporating secondary cutting ed Blade-equipped drilling tool, incorporating secondary cutting ed

1997-11-19

1999-09-28

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

With fluid conduit lining or element

175431, E21B 1018

Patent

active

059572272

ABSTRACT:
A drilling tool has several blades 16 each defining an outside wall 20 and two side walls 22, 24. The blades are separated by recesses 18, primary bits 28 are located along the outside wall of the blades, and secondary or backup bits 40 are attached behind the primary bits in relation to the direction of travel (f) of the tool. Each of the blades defines at least one divergent tunnel or channel 30 having small entry opening 32 located in the outside wall of the blade, behind the primary bits, and a larger exit opening 34 located on the rear side of the blade. The secondary bits are mounted at the rear edge of the entry opening, and the channel serves to discharge material excavated by them.

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