发明申请
US20140353046A1 HYBRID BIT WITH ROLLER CONES NEAR THE BIT AXIS 审中-公开
混合位与轴位置附近的滚子

HYBRID BIT WITH ROLLER CONES NEAR THE BIT AXIS
摘要:
A drill bit includes a bit body having a longitudinal axis extending there through, a plurality of journals extending downward and radially outward from the bit body, each journal having a journal axis extending from a base of the journal through the length of the journal, wherein the journal axis at the base is at a first radial distance from the longitudinal axis, a roller cone rotatably mounted to each of the journals, and at least one blade protruding from the bit body and extending axially and radially along the bit body from a first end to a second end, wherein the first end is at a second radial distance from the longitudinal axis greater than the first radial distance, and wherein the second end is at a gage region of the drill bit.
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