发明授权
- 专利标题： Bi-center bit with oppositely disposed cutting surfaces
- 专利标题（中）： 双中心钻头具有相对设置的切割面
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申请号： US955147申请日： 1997-10-21
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公开(公告)号： US5992548A公开(公告)日： 1999-11-30
- 发明人: Roger Silva , Brad Weston , Henry Rebollido , Coy M. Fielder
- 申请人： Roger Silva , Brad Weston , Henry Rebollido , Coy M. Fielder
- 申请人地址： TX Houston
- 专利权人： Diamond Products International, Inc.
- 当前专利权人： Diamond Products International, Inc.
- 当前专利权人地址： TX Houston
- 主分类号： E21B10/26
- IPC分类号： E21B10/26 ; E21B10/42 ; E21B10/43 ; E21B10/54 ; E21B10/55 ; E21B10/56 ; E21B10/567 ; E21B10/573 ; E21B17/10
摘要：
An improved bi-center bit with improved directional stability and wear resistance is disclosed, which bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further the pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.
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