Review on the Development of Sonic Logging While Drilling
Review on the Development of Sonic Logging While Drilling
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发表时间：
2009
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通讯作者：
Zhang Xu-jian
中科院分区：
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作者：
Zhang Xu-jian
介绍了声波随钻测井的现状，包括纵波测量、横波测量和声波随钻测井仪器，分析了实际声波随钻测井的难点，声波隔离器是随钻纵波测量的关键，从泄漏纵波估算极慢地层纵波慢度的方法近年来也取得了一些进展，综述了随钻测井横波测量的进展。在慢速地层中，偶极子模式和四极模式都是可选的，但在偶极子模式下估计剪切慢度的可行性存在争议，这证实了在随钻偏心声波测井的波传播研究中的可能性。偏心仪器存在色散，与震源类型无关。关于真实随钻声波随钻测井噪声的研究文献表明，噪声传播到低频区域，即横波测量频域，这将不可避免地影响横波测量。
Introduced is the status about sonic LWD including compressional wave measurement,shear wave measurement and sonic LWD tool,and analysed are difficulties in real sonic LWD.Acoustic isolator is the key to LWD compressional wave measurement.Some progresses have also been made in the method of estimating the slowness of P wave in very slow formation from leaky-P wave in recent years.Then summarized are the progresses about the LWD shear wave measurement.The LWD shear wave measurement in fast formation can be realized by monopole mode and quadrapole mode;in the slow formation,both dipole mode and quadrapole mode are optional.However,the feasibility of estimating the shear slowness in dipole mode is controversial,which has confirmed the possibility in the wave propagation studies on acoustic logging while drilling eccentric tool.There is dispersion for the off-centered tool regardless of the source type.The research documents about noise in real sonic LWD indicate the noise spreads to cover the low frequency domain,which is the shear wave measurement frequency domain.It will influence the shear wave measurement inevitably.