| 简介 |
An earth-boring drill bit comprising a bit body configured at its upper extent for connection into a drillstring is described. A selected number of fixed blades extend downward from the bit body, and a selected number of rolling cutters are mounted for rotation on the bit body. A plurality of rolling- cutter cutting elements are arranged on each rolling cutter and a plurality of fixed-blade cutting elements are arranged on each fixed blade. In accordance with aspects of the present disclosure, the selected number of fixed blades exceeds the selected number of rolling cutters by at least one. |
客服热线：
手机版
二维码
