发明名称 |
Down hole tool with adjustable fluid viscosity |
摘要 |
A down hole tool includes a tool body, a fluid cavity, a magnetorheological fluid disposed in the fluid cavity, and an electrical control unit in communication with the MR fluid. The electrical control unit is configured to adjust a viscosity of the MR fluid by varying a magnetic field. |
申请公布号 |
GB2451345(B) |
申请公布日期 |
2010.06.30 |
申请号 |
GB20080013583 |
申请日期 |
2008.07.24 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
ARLEY G LEE |
分类号 |
E21B31/113;E21B31/107;E21B34/00;E21B34/06 |
主分类号 |
E21B31/113 |
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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