超声波作用下井孔能量传输理论研究

发布时间：2018-05-23 12:27

本文选题：声波衰减 + 透射损失　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：超大功率超声波采油技术利用大功率超声波来处理、激励油气储集层,实现注采井的增产增注和提高油藏整体采收率的目的。目前对于超声波能量传输问题尚未确切的研究,所以本文从能量传输的角度出发分析计算了超声波能量的损失情况。首先,从平面波理论出发计算了超声波通过固液界面时产生的能量损失,在计算中忽略多次反射的因素,计算得到最终到达储油层的超声波能量仅占初始发射能量的19.7%;其次,从柱面波理论出发计算了柱声源情况下声波的扩散衰减、散射衰减以及吸收衰减,其中柱面波的扩散衰减是导致声波有效作用距离受限的主要原因;再次,对比平面波在液固界面及固固界面的散射衰减,得到超声波最终到达储油层中的透射声强为初始声强的17.68%。然后,推导了原油中声波的粘滞吸收衰减系数,得到衰减系数与频率的平方成正比;最后,对声场的压力分布进行数值模拟,得到超声波的声压分布图及其沿油井径向的声压衰减曲面图和声压变化率曲线。
[Abstract]:The ultra-large power ultrasonic oil recovery technology uses the high power ultrasonic wave to process, excites the oil and gas reservoir, realizes the injection-production well to increase the production to increase the injection and the enhancement reservoir whole recovery factor goal. At present, the problem of ultrasonic energy transmission has not been studied exactly, so the energy loss of ultrasonic wave is analyzed and calculated from the point of view of energy transmission. Firstly, the energy loss caused by ultrasonic wave passing through the solid-liquid interface is calculated based on plane wave theory, and the factor of multiple reflection is ignored in the calculation, and the ultrasonic energy that finally reaches the reservoir is only 19.7% of the initial emission energy. Based on the cylindrical wave theory, the diffusion attenuation, scattering attenuation and absorption attenuation of acoustic waves in cylindrical sound source are calculated. The diffusion attenuation of cylindrical wave is the main reason for the limitation of the effective range of acoustic waves. By comparing the scattering attenuation of plane wave at the liquid-solid interface and the solid-solid interface, it is obtained that the transmitted sound intensity of the ultrasonic wave finally reaching the reservoir is 17.68% of the initial sound intensity. Then, the viscous absorption attenuation coefficient of acoustic wave in crude oil is deduced, and the attenuation coefficient is directly proportional to the square of frequency. Finally, the pressure distribution of sound field is numerically simulated. The sound pressure distribution chart of ultrasonic wave and the curve of sound pressure attenuation surface along the radial direction of oil well and the change rate curve of sound pressure are obtained.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE31

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