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Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith
Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith
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机译:具有导向切割器构造的旋转式刮刀钻头以及用其预破裂地下岩层的方法
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摘要
A rotary drag bit exhibiting enhanced cutting efficiency and extended life is provided. The rotary drag bit comprises a bit body having a face surface, and a plurality of cutters coupled to the face surface of the bit body. The plurality of cutters comprises at least one pilot cutter and a rotationally trailing larger, primary cutter at substantially the same radius and, optionally of slightly less exposure. The pilot cutter is sized and positioned to pre-fracture the formation and perform an initial cut, while the primary cutter removes weakened, remaining formation material along the same rotational path. A method to pre-fracture subterranean formations using a rotary drag bit having a pilot cutter configuration is also provided.
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