| 摘要 |
According to one embodiment, a rotary drill bit comprises a bit body with a bit rotational axis extending through the bit body; blades disposed outwardly from exterior portions of the bit body; and cutting elements disposed outwardly from exterior portions of each blade. At least one blade has a substantially arched configuration. Each blade comprises a leading surface and a trailing surface, where the leading surface is disposed on the side of the blade toward the direction of rotation of the rotary drill bit, and the trailing surface is disposed on the side of the blade opposite to the direction of rotation of the rotary drill bit. The rotary drill bit also comprises junk slots. Each junk slot is disposed between an adjacent leading surface and an adjacent trailing surface of associated blades.
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