Anti-balling cutting structure

Details Anti-balling cutting structure Anti-balling cutting structure

E - Fixed Constructions

21

B

255/72

E21B 10/16 (2006.01)

Patent

CA 2033548

ABSTRACT OF THE DISCLOSURE A three cone earth boring bit having circumferential rows of earth disintegrating teeth of wear resistant inserts of selected projection from the cone surfaces, one cone having an inner row separated from a heel row by a narrow circumferential groove and a second cone having a hell-catching row that intermeshes with the narrow groove by an amount to minimize balling. A nozzle directs a jet stream with a high velocity core past the cone and inserts of adjacent cutters to the bore hole bottom to break up the filter cake while the lower velocity skirt strikes the material packed between the inserts of adjacent cones. A row of small diameter, recessed reaming inserts replaces the conventional heel row on the cone having a hell- catching row, thus providing space for the lateral displacement of the material generated between adjacent inserts in the critical hell-catching row.

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