发明名称 |
Nuclear magnetic resonance well logging method and apparatus |
摘要 |
The present invention relates generally to a nuclear magnetic resonance apparatus and method for substantially eliminating the effects of phase coherent acoustic ringing in borehole logging. A series of cycles of measurement pulse sequences are applied to the formation surrounding the borehole. Each pulse sequence includes an RF excitation pulse and several RF refocusing pulses. Spin echoes are received that contain spurious ringing signals from the excitation and refocusing pulses. Spin echo signals from corresponding spin echoes of each cycle are combined and substantially cancel the spurious ringing from the excitation and refocusing pulses of the pulse sequences.
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申请公布号 |
US6570381(B1) |
申请公布日期 |
2003.05.27 |
申请号 |
US19990276049 |
申请日期 |
1999.03.25 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
SPEIER PETER;GANESAN KRISHNAMURTHY;SUN BOQIN;TAHERIAN REZA;STRALEY CHRISTIAN |
分类号 |
G01R33/44;G01V3/32;(IPC1-7):G01V3/00 |
主分类号 |
G01R33/44 |
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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