发明名称 |
Method of drilling a bore hole |
摘要 |
A method to drill a borehole includes drilling the borehole through an overburden with a drill bit selected to optimize a drilling performance parameter and drilling the borehole through a production zone with another drill bit selected to optimize a production performance parameter.
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申请公布号 |
US7571778(B2) |
申请公布日期 |
2009.08.11 |
申请号 |
US20070876371 |
申请日期 |
2007.10.22 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
ROCK DOUGLAS LAWRENCE |
分类号 |
E21B7/00;E21B43/30;E21B44/00;E21B47/00 |
主分类号 |
E21B7/00 |
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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