发明名称 |
SONIC DATA LOGGING SYSTEM |
摘要 |
<p>A sonic logging method involves the pre-processing of a detection signal by a downhole processing device to determine the arrival time of a sonic signal at a receiver which is then transmitted to the surface. A suitable sonic logging downhole tool includes a control device for controlling generation and reception of the sonic signal, an A-D converter for digitizing the detected signal at a predetermined sampling interval, a first memory for storing the digitized waveform, a second memory for storing a program for processing the digitized waveform, and a microprocessor capable of executing the stored program so as to determine an arrival time of the sonic signal arriving at the receiver.</p> |
申请公布号 |
EP0877960(A1) |
申请公布日期 |
1998.11.18 |
申请号 |
EP19970902530 |
申请日期 |
1997.01.31 |
申请人 |
SCHLUMBERGER LIMITED;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER TECHNOLOGY B.V.;SERVICES PETROLIERS SCHLUMBERGER |
发明人 |
FUKUHARA, MASAFUMI;TEJADA, MAURICIO |
分类号 |
E21B47/12;E21B47/14;G01H5/00;G01V1/28;G01V1/40;G01V1/48;(IPC1-7):G01V1/40 |
主分类号 |
E21B47/12 |
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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