发明名称 |
Method to control bit load |
摘要 |
The method of controlling the load on a drill bit drilling a hole by providing differential pressure across a seal area on a drilling assembly to increase the bit load and providing a relief valve from the annular area above the seal to the bore returning fluid to the surface to limit the maximum differential pressure to limit the maximum load allowed. |
申请公布号 |
US8240397(B2) |
申请公布日期 |
2012.08.14 |
申请号 |
US20090459665 |
申请日期 |
2009.07.07 |
申请人 |
CRAWFORD JAMES R.;BAUGH BENTON FREDERICK |
发明人 |
CRAWFORD JAMES R.;BAUGH BENTON FREDERICK |
分类号 |
E21B21/08;E21B44/06 |
主分类号 |
E21B21/08 |
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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