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1. 发明授权

US06581010B2 Semblance processing for an acoustic measurement-while-drilling system for imaging of formation boundaries 有权
公开(公告)号：US06581010B2
公开(公告)日：2003-06-17
申请号：US10190955
申请日：2002-07-08
申请人： Vladimir Dubinsky , James V. Leggett, III , Alexi Bolshakov
发明人： Vladimir Dubinsky , James V. Leggett, III , Alexi Bolshakov
IPC分类号： E21B4900
CPC分类号： E21B43/08 , E21B43/12 , E21B43/14 , G01V1/48
摘要： The present invention provides a system for drilling boreholes having a downhole subassembly which contains an acoustic measurement-while-drilling system. It uses the acoustic velocity through the formations surrounding the borehole and an acoustic transmitter and a set of receivers for determining the bed boundaries surrounding the borehole formation. An acoustic isolator on the tool may be used to attenuate body waves traveling between the transmitter and the receivers. Additional attenuation of the body waves is provided by a threshold filter based upon the absolute maximum of the received signals. Semblance of the data is determined in a slowness/intercept-time domain. Coherence and semblance filtering methods are used to differentiate between reflection signals and noise. The position and orientation of the bed boundary relative to the tool are determined. A further processing step uses the relative position and orientation determined for a number of tool positions to further discriminate against noise and obtain an absolute position and depth of the bed boundaries.

2. 发明授权

US06427124B1 Semblance processing for an acoustic measurement-while-drilling system for imaging of formation boundaries 有权
标题翻译：用于成像边界成像的声学测量同时钻孔系统的外观加工
公开(公告)号：US06427124B1
公开(公告)日：2002-07-30
申请号：US09347754
申请日：1999-07-06
申请人： Vladimir Dubinsky , James V. Leggett, III , Alexi Bolshakov
发明人： Vladimir Dubinsky , James V. Leggett, III , Alexi Bolshakov
IPC分类号： G01V140
CPC分类号： E21B43/08 , E21B43/12 , E21B43/14 , G01V1/48
摘要： The present invention provides a system for drilling boreholes having a downhole subassembly which contains an acoustic measurement-while-drilling system. It uses the acoustic velocity through the formations surrounding the borehole and an acoustic transmitter and a set of receivers for determining the bed boundaries surrounding the borehole formation. An acoustic isolator on the tool may be used to attenuate body waves traveling between the transmitter and the receivers. Additional attenuation of the body waves is provided by a threshold filter based upon the absolute maximum of the received signals. Semblance of the data is determined in a slowness/intercept-time domain. Coherence and semblance filtering methods are used to differentiate between reflection signals and noise. The position and orientation of the bed boundary relative to the tool are determined. A further processing step uses the relative position and orientation determined for a number of tool positions to further discriminate against noise and obtain an absolute position and depth of the bed boundaries.
摘要翻译：本发明提供了一种用于钻孔的系统，其具有包含声学测量同时钻孔系统的井下子组件。它使用通过围绕钻孔的地层的声速和用于确定围绕钻孔地层的床边界的声发射器和一组接收器。工具上的声学隔离器可用于衰减在发射器和接收器之间传播的身体波。通过基于接收信号的绝对最大值的阈值滤波器来提供身体波的附加衰减。数据的相似性在慢/截取时域中确定。相干和相似滤波方法用于区分反射信号和噪声。确定床边界相对于工具的位置和方向。进一步的处理步骤使用为多个工具位置确定的相对位置和取向进一步区分噪声并获得床边界的绝对位置和深度。

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