| 发明名称 |
Active noise cancellation through the use of magnetic coupling |
| 摘要 |
Passive suppression of casing signals is used to improve the ability to measure formation velocities. Passive suppression includes the use of a magnet slidably coupled to the casing.
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| 申请公布号 |
US7911877(B2) |
申请公布日期 |
2011.03.22 |
| 申请号 |
US20090646694 |
申请日期 |
2009.12.23 |
| 申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
PATTERSON DOUGLAS J.;TANG XIAO MING;BOLSHAKOV ALEXEI |
| 分类号 |
G01V1/00 |
主分类号 |
G01V1/00 |
| 代理机构 |
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代理人 |
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