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Field validation of imaging an adjacent borehole using scattered P-waves
Petroleum Science ( IF 5.6 ) Pub Date : 2020-07-02 , DOI: 10.1007/s12182-020-00475-5
Jian-Lin Ben , Wen-Xiao Qiao , Xiao-Hua Che , Xiao-Dong Ju , Jun-Qiang Lu , Bai-Yong Men

Acoustic waves enter a rock formation from a borehole and are reflected or scattered upon encountering a geologic structure. Consequently, we obtain the structure location represented by the azimuth and distance from the borehole using the acoustic reflection or scattering. Downhole acoustic measurements with the azimuthal resolution are realized using an azimuthal acoustic receiver sonde composed of several arcuate phased array receivers. Eight sensors distributed evenly across the arcuate phased array receiver can record acoustic waves independently; this allows us to adopt the beamforming method. We use a supporting logging tool to conduct the downhole test in two adjacent fluid-filled boreholes, for validating the evaluation of the geologic structure using scattered P-waves. The test results show the multi-azimuth images of the target borehole and the azimuthal variation in scattering amplitudes. Thus, we obtain the precise location of the target borehole. Furthermore, the measured values of the target borehole are consistent with the actual values, indicating that we can accurately evaluate a near-borehole geologic structure with scattered P-waves.

中文翻译:

使用散射P波对相邻井眼成像的现场验证

声波从井筒进入岩层,并在遇到地质结构时被反射或散射。因此,我们利用声反射或散射获得由方位角和距钻孔的距离表示的结构位置。使用由几个弓形相控阵接收器组成的方位声接收器探空仪可以实现具有方位角分辨率的井下声学测量。八个传感器均匀分布在弧形相控阵接收器上,可以独立记录声波。这使我们可以采用波束成形方法。我们使用辅助测井工具在两个相邻的充满流体的钻孔中进行井下测试,以验证使用散射P波对地质结构的评估。测试结果显示了目标井眼的多方位图像和散射幅度的方位角变化。因此,我们获得了目标井眼的精确位置。此外,目标钻孔的测量值与实际值一致,表明我们可以准确地评估具有散射P波的近钻孔地质结构。
更新日期:2020-07-02
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