Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Patent
1979-04-11
1981-09-22
Favreau, Richard E.
Boring or penetrating the earth
Bit or bit element
Cutting edge self-renewable during operation
175 42, 175 39, 175409, 175393, 408 16, 408 59, 408145, E21B 1060
Patent
active
042904986
ABSTRACT:
There is disclosed an ablatible drill comprising a soft or frangible matrix having embedded therein a multiplicity of hard inclusions which act as cutting teeth. During drilling, the matrix gradually wears away so that worn inclusions are circulated out of the hole and fresh inclusions are exposed as new cutting teeth. A plurality of joints of the ablatible drill are interconnected on the bottom of a drill string. The comminuted material of each joint of the ablatible drill provides a characteristic distinguishable from the comminuted material of adjacent joints so that in examination of the circulated returns provides an indication of which joint is then being drilled.
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