发明申请
- 专利标题: HYBRID BIT WITH ROLLER CONES NEAR THE BIT AXIS
- 专利标题(中): 混合位与轴位置附近的滚子
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申请号: US14285676申请日: 2014-05-23
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公开(公告)号: US20140353046A1公开(公告)日: 2014-12-04
- 发明人: Zhehua Zhang , Jiaqing Yu , Scott D. McDonough
- 申请人: Smith International, Inc.
- 申请人地址: US TX Houston
- 专利权人: Smith International, Inc.
- 当前专利权人: Smith International, Inc.
- 当前专利权人地址: US TX Houston
- 主分类号: E21B10/14
- IPC分类号: E21B10/14
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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