发明名称 |
Rotary bit with jet nozzles |
摘要 |
A jet rotary drill bit confirming a first strainer element allowing the passage of mud carrying small-sized particles, but preventing relatively coarse particles from passing to the jet nozzles. The first strainer element is self-cleaning and the relatively coarse particles are passed on to a second strainer on which they remain trapped.
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申请公布号 |
US4341273(A) |
申请公布日期 |
1982.07.27 |
申请号 |
US19810267957 |
申请日期 |
1981.05.28 |
申请人 |
SHELL OIL COMPANY |
发明人 |
WALKER, BRUCE H.;FEENSTRA, ROBIJN |
分类号 |
E21B10/18;E21B10/60;E21B21/00;E21B27/00;(IPC1-7):E21B10/18;E21B12/06 |
主分类号 |
E21B10/18 |
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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