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为了探讨任意胶结状况下的套管井中均能直接并清晰的测量到地层信息的可行性,开展了套管井缩小模型的声波测井实验室物理模拟研究。实验测量了套管井不同胶结状况下相控线阵声源做发射器时的全波波形。通过对相控线阵声源不同偏转角时测量的全波波形分析表明,在Ⅰ、Ⅱ界面均胶结良好时随着相控线阵阵元间激励延迟时间的增加,当相控线阵声源的声束偏转角先后等于地层第一临界角和第二临界角时可使井孔中接收的地层滑行纵波和滑行横波幅度分别加强到最大;在套管井Ⅰ界面胶结差以及自由套管中,仍有效的探测到了地层的滑行纵波和横波信息。此实验结果验证了在任意胶结状况下的套管井中均能直接测量到地层信息的可行性,为开发新一代的套管井相控线阵声波测井仪奠定了实验基础。
In order to investigate the feasibility of directly and clearly measuring formation information in cased wells with arbitrary cementation conditions, a physical simulation of sonic well logging laboratory for cased-hole reduction model was carried out. The full-wave waveform of the phased array acoustic source as a transmitter under different cementing conditions was measured experimentally. The analysis of the full-wave waveform measured at different deflection angles of the phased array sound source shows that with the increase of the excitation delay time between the phased array elements when both the interface of Ⅰ and Ⅱ are cemented well, when the phased array sound Source beam deflection angle is equal to the first critical angle of the formation and the second critical angle can make the borehole in the formation of gliding wave and sliding shear amplitude were enhanced to the maximum; , It is still valid to detect the formation of gliding longitudinal and shear waves information. The experimental results verify the feasibility of directly measuring formation information in cased wells under any cementation condition, which lays the foundation for the development of a new generation of cased-hole phased array acoustic logging tools.