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单井成像是一种利用井外界面上产生的反射波进行界面探测的井下声学成像技术,但目前该技术在界面方位判定中还存在缺陷.本文从弹性波动方程出发,推导了反射波声压和位移的相位变化规律,建立了一种依据反射波相位的界面方位判别法:反射波与哪个区域中的入射波在声压和位移的相位特征上可以满足反射波相位变化规律,则反射波就来自哪个区域.文中用数值模拟获得的信号进行了界面方位识别,结果表明本文给出的方法是有效的.该方法的主要优点在于,仅依靠来自于井下的接收信号就可以将成像区间限定在井径平面的某一象限内.
Single-well imaging is a downhole acoustic imaging technique that utilizes the reflected wave generated at the outer surface of a well to detect the interface, but at present, this technique still has some defects in determining the orientation of the interface.According to the elastic wave equation, And the phase change law of displacement, an interface orientation discrimination method based on the phase of the reflected wave is established. The incident wave in the reflected wave and the region can meet the phase change law of the reflected wave in the phase characteristics of sound pressure and displacement, Which region comes from.The signal obtained by numerical simulation is used to identify the azimuth of the interface.The results show that the method presented in this paper is effective.The main advantage of this method is that the imaging interval can be defined only by the received signal from the downhole Within a quadrant of the well bore plane.