随钻声波测井技术发展现状

摘要

The theory of acoustic LWD and the instrument are introduced .With the development of more than 20 years, acoustic logging technologies of monopole , multi-pole and asymmetric source are formulated , not only compressional wave and shear wave measurement in fast and slow formation but also azimuth acoustic measurement can be achieved .The difficulty of data processing of acoustic LWD is how to eliminate the effect of drilling noise and off-center in the formation signal , the rotary stacking metrology is an advanced stacking process for signal-to-noise enhancement .The key technology of acoustic LWD contains acoustic transducer , isolator and downhole circuit , especially the acoustic transducer and the isolator is essential for acoustic wave measurement .Acoustic LWD has widely application prospect and would represent the advanced acoustic logging technology in the future .%文章介绍了随钻声波测井理论和仪器。经过二十多年的发展，已经形成了单极子、多极子和偏心声源测井技术，不仅能够实现快慢地层的纵横波速度测量，而且能够实现方位声波的测量。随钻声波数据处理的难点在于解决钻井噪声和仪器偏心对地层信号的影响，旋转叠加技术提供了一种消除噪声影响的途径。随钻声波测井仪研制需要解决的关键技术包括，声波换能器、隔声体和井下电路的设计，其中声波换能器和隔声体的设计至关重要。随钻声波测井技术代表了未来声波测井的发展趋势，具有广泛的应用前景。