发明名称 |
Rotary drill bits and method of use |
摘要 |
A rotary drill bit for use in subsurface formations includes fluid channels for the passage of drilling mud to remove cuttings. According to the invention to clear blockages there are only one or two unbranched channels for the passage of mud past the cutting elements and these are arranged in a spiral.
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申请公布号 |
US4397363(A) |
申请公布日期 |
1983.08.09 |
申请号 |
US19810222142 |
申请日期 |
1981.01.02 |
申请人 |
DRILLING & SERVICE U.K. LIMITED |
发明人 |
FULLER, JOHN M. |
分类号 |
E21B10/46;E21B10/42;E21B10/43;E21B10/44;E21B10/60;(IPC1-7):E21B10/18 |
主分类号 |
E21B10/46 |
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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