Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1997-06-20
2000-05-09
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175431, E21B 1008
Patent
active
060590548
ABSTRACT:
A cutter element that balances maximum gage-keeping capabilities with minimal tensile stress induced damage to the cutter elements is disclosed. The cutter elements of the present invention have a non-symmetrical shape and may include a more aggressive cutting profile than conventional cutter elements. In one embodiment, a cutter element is configured such that the inside angle at which its leading face intersects the wear face is less than the inside angle at which its trailing face intersects the wear face. This can also be accomplished by providing the cutter element with a relieved wear face. In another embodiment of the invention, the surfaces of the present cutter element are curvilinear and the transitions between the leading and trailing faces and the gage face are rounded, or contoured. In this embodiment, the leading transition is made sharper than the trailing transition by configuring it such that the leading transition has a smaller radius of curvature than the radius of curvature of the trailing transition. In another embodiment, the cutter element has a chamfered trailing edge such that the leading transition of the cutter element is sharper than its trailing transition. In another embodiment, the cutter element has a chamfered or contoured trailing edge in combination with a canted wear face. In still another embodiment, the cutter element includes a positive rake angle on its leading edge.
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Cawthorne Chris Edward
Garcia Gary Edward
McDonough Scott D.
Minikus James Carl
Nese Per Ivar
Smith International Inc.
Tsay Frank
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