E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/56 (2006.01) E21B 10/55 (2006.01)
Patent
CA 2690519
A wedge shaped cutter insert for a drag type drill bit head having a cutting face comprising: an elongate body having a drill bit head insertion end portion and an opposite cutting end portion; and, a wedge extending from and above the cutting end portion, said wedge having an arris extending centrally across the end portion of the elongate body and opposite sloping sides extending up and back from the arris. In use the arris on the cutter insert is oriented in the cutting face of the drag type cutter bit head generally perpendicular to the direction of cut so that a generally triangular face, with the arris pointing downwardly, ploughs into a formation. A drag type drill bit head comprises: a cutter insert as described above; said cutter insert having the arris of the wedge oriented perpendicularly to the direction of cut. A method of manufacturing a drag type drill bit head comprises the following steps: a) providing a drag type drill bit head having cutter insert openings on its cutting face; b) providing cutter inserts as described above; c) matingly inserting and securing the cutter inserts in the cutter openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut. In use, a generally triangular face, with the arris pointing downwardly, ploughs into the formation.
Na
Pop Peter L.
LandOfFree
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