发明授权
- 专利标题: Bi-center bit adapted to drill casing shoe
- 专利标题(中): 双中心钻头适用于钻套管鞋
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申请号: US09969444申请日: 2001-10-02
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公开(公告)号: US06629476B2公开(公告)日: 2003-10-07
- 发明人: Coy M. Fielder , Rogerio H. Silva
- 申请人: Coy M. Fielder , Rogerio H. Silva
- 主分类号: B21K504
- IPC分类号: B21K504
摘要:
The invention is directed to a bi-center drilling tool adapted to fit within and drill through a casing shoe without damage to the surrounding casing. In one embodiment, the tool comprises a bit body having a proximal and a distal end where the distal end defines a pilot bit and an intermediate reamer section, where each the pilot and reamer sections define a bit face including primary and secondary cutting blades and cutting elements disposed on said blades. In this embodiment, the cutting or wear elements disposed on the one or more cutting blades which extend to or are proximate to the pass-through gauge define a selected angle between the line of contact on the cutting or wear elements and the material to be drilled.
公开/授权文献
- US20020092378A1 Bi-center bit adapted to drill casing shoe 公开/授权日:2002-07-18
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