Earth-boring tools having cutting elements with cutting faces exhibiting multiple coefficients of friction, and related methods

摘要

An earth-boring tool having at least one cutting element with a multi-friction cutting face provides for the steering of formation cuttings as the cuttings slide across the cutting face. The multi-friction cutting element includes a diamond table bonded to a substrate of superabrasive material. The diamond table has a cutting face formed thereon with a cutting edge extending along a periphery of the cutting face. The cutting face has a first area having an average surface finish roughness less than an average surface finish roughness of a second area of the cutting face, the two areas separated by a boundary having a proximal end proximate a tool crown and a distal end remote from the tool crown.

主权项

1. An earth-boring tool, comprising:
a tool crown; and at least one cutting element attached to the tool crown, the at least one cutting element comprising a superabrasive material having a cutting face and a cutting edge extending along a periphery of the cutting face, a first area of the cutting face having a first average surface roughness and a second area of the cutting face having a second average surface roughness greater than the first average surface roughness, wherein a boundary between the first area and the second area extends from a location on the cutting face proximate a profile of the tool crown to an area remote from the tool crown, and the first area of the cutting face, the second area of the cutting face, and the boundary are in combination located and oriented to steer a formation cutting severed by a portion of the cutting edge in contact with a formation in a direction laterally away from a center of the cutting face as the formation cutting contacts the cutting face.