发明名称 |
METHOD AND SYSTEM FOR SONIC WELL LOGGING |
摘要 |
<p>M2-004 20.1926 DII METHOD AND APPARATUS FOR ACOUSTIC LOGGING OF A BOREHOLE A method and apparatus are described for preferentially exciting for extracting late arrivals at low frequencies in an acoustic investigation of a borehole. The late arrival may be the Stoneley wave whose amplitude is derived by measuring the energy in a predetermined frequency band of a waveform produced with a low frequency transmitter-receiver system. The transmitter produces a highly damped acoustic pulse whose frequency spectrum is selected to preferentially excite a late arrival such as the Stoneley wave and/or tube wave with wavelengths which are significantly greater than the diameter of the borehole while preserving measurable earlier arrivals at higher frequencies. A receiver system is used which provides a generally flat frequency response including low frequencies to produce waveforms of both the earlier arrivals at high frequencies and late arrivals at low frequencies with sufficient extractable amplitudes throughout a wide range of borehole and formation conditions. A method for generating the display are described for the investigations of the late arrival.</p> |
申请公布号 |
CA1166739(A) |
申请公布日期 |
1984.05.01 |
申请号 |
CA19780308913 |
申请日期 |
1978.08.08 |
申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
INGRAM, JOHN D. |
分类号 |
G01V1/24;G01V1/34;G01V1/40;(IPC1-7):G01V1/34 |
主分类号 |
G01V1/24 |
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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