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套管井胶结差时,地层声速的测量是一个很重要的测井难题。为解决这一难题,提出了一种过套管双源反激声波测井方法,从数据采集上压制套管波,增强地层波的信噪比。模拟计算了这种情况下双源反激的测井声波波形,并在实验室制作了1:10的套管模型井,进行了物理模拟实验。计算结果表明利用该方法可以有效压制套管波,并能清晰地识别出地层纵波。对实测波形的分析表明,实验条件下采用双源反激方法套管波幅度能够被压制到单源激励时的0.12倍,有效提高了地层波的信噪比,并能有效提取地层波的速度。理论和物理模拟结果验证了该方法的可行性,为其工程应用奠定了基础。
Casing well cementing, the formation sound velocity measurement is a very important logging problems. In order to solve this problem, an over-cased dual-source anti-shock acoustic logging method is proposed to compress the casing wave from the data acquisition and enhance the signal-to-noise ratio of the formation wave. The dual-source anti-shock logging acoustic waveforms were simulated and simulated in this case. A 1:10 casing model well was fabricated in the laboratory and physical simulation experiments were carried out. The calculation results show that this method can effectively suppress the casing wave and can clearly identify the longitudinal compressional wave. The analysis of the measured waveforms shows that under the experimental conditions, the amplitude of the bushing wave can be suppressed to 0.12 times of the single-source excitation by using the dual-source flyback method, effectively improving the signal-noise ratio of the formation wave and effectively extracting the velocity of the formation wave . The theoretical and physical simulation results verify the feasibility of the method and lay a foundation for its engineering application.