声波在套管井水泥胶结测井中的研究与计算

Research and Calculation of Acoustic Wave in Cement Bond Logging of Casing Well

以声学原理为基础,首先建立了水泥胶结测井模型,然后对套管波中的套管滑行波、一次反射波和多次反射波的能量方程进行了推导,进而对声波测井过程中声波的反射系数、折射系数、吸收衰减系数以及散射衰减系数进行了计算,最终计算出声波接收装置接收到的声波能量大小,并且得出了水泥胶结测井过程中各环节声波衰减量,以此判断各个环节声波衰减对水泥胶结测井的影响,所得结论对水泥胶结测井中声波能量的计算具有重要的指导意义。

Based on acoustic principles, a cement bond logging model was first established, and the energy equations of the casing wave, the first reflection wave and the multiple reflection wave were derived, and then the reflection coefficient, refraction coefficient, absorption attenuation coefficient and scattering attenuation coefficient in the acoustic logging were calculated. At last, the acoustic energy that was received by acoustic receiver was calculated, and acoustic attenuation of every links in the cement bond logging process was obtained to judge the effect of acoustic attenuation of every links on the cement bond logging.