发明名称 |
ROTARY DRILL BIT SHANK, ROTARY DRILL BITS SO EQUIPPED, AND METHODS OF MANUFACTURE |
摘要 |
A shank configuration for rotary drill bits, is disclosed for positioning of the shank in relation to the bit body. A tapered surface or feature of the shank may be configured and sized to matingly engage a complementarily shaped surface or feature of the drill bit body and thereby become centered or positioned in relation thereto. A deformable element may be disposed between the shank and bit body. Also, the shank may comprise a material having a carbon equivalent of less than about 0.35%. A multi-pass weld procedure may be employed to affix the shank and bit body to one another wherein welds may be formed so that one weld originates at a circumferential position that differs from the origination circumferential position of its immediately preceding weld by at least about 90~. Further, a stress state may be developed within the multi-pass weld. A method of manufacture is also disclosed.
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申请公布号 |
CA2602020(C) |
申请公布日期 |
2012.03.20 |
申请号 |
CA20062602020 |
申请日期 |
2006.03.24 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
ZAHRADNIK, ANTON F.;SULLIVAN, ERIC C.;SMITH, R. SCOT;RUFF, DANIEL E.;ROBERTS, DANIELLE V.;MASSEY, ALAN J. |
分类号 |
E21B10/54 |
主分类号 |
E21B10/54 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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