School of Civil Engineering, Architecture and Environment, Xihua University, Chengdu 610039, PR China.
School of Electronic Science & Engineering, Southeast University, Nanjing 211100, PR China.
Ultrason Sonochem. 2020 Apr;62:104515. doi: 10.1016/j.ultsonch.2019.03.006. Epub 2019 Mar 9.
In this paper, the effects of ultrasonic wave on the removal of inorganic scaling and plugging in cores and the influence of the key wave field parameters, process parameters and core physical parameters on the plugging removal efficiency are systematically studied. The main dynamic mechanism of ultrasonic plugging removal is also systematically analyzed. Results show that the transducer frequency, transducer power, ultrasonic treatment time and initial permeability of core have great influence on the effect of ultrasonic scale removal. When the cumulative treatment time of ultrasonic wave exceeds 60 min, the recovery rate of core permeability tends to be stable. Best effect can be achieved when processing for 80-120 min cumulatively; the plugging removal effect is improved with the increase of ultrasonic transducer power and ultrasonic frequency, but the effect of plugging removal is not obvious with the further increasing of them. In addition, it is proved that the effect of removing calcium carbonate plug from near wellbore by hydrochloric acid solution is slightly better than that by ultrasonic treatment alone. Finally, the micro dynamic mechanism of removing inorganic scale plug by high-power ultrasonic treatment is discussed in view of ultrasonic inorganic scale body crushing, ultrasonic cavitation, ultrasonic friction, ultrasonic peristaltic transport operation and ultrasonic fracture-making and permeability-increasing effect.
本文系统研究了超声波对岩心无机垢和堵塞的去除效果，以及关键波场参数、工艺参数和岩心物理参数对堵塞去除效率的影响。还系统分析了超声波堵塞去除的主要动力学机制。结果表明，换能器频率、换能器功率、超声波处理时间和岩心初始磁导率对超声波除垢效果有很大影响。当超声波累计处理时间超过 60min 时，岩心渗透率的恢复率趋于稳定。累计处理 80-120min 时效果最佳；随着超声波换能器功率和超声波频率的增加，堵塞去除效果得到提高，但进一步增加时，堵塞去除效果并不明显。此外，还证明了盐酸溶液对近井地带碳酸钙堵塞的去除效果略优于单独的超声波处理。最后，针对大功率超声波处理对无机垢堵塞的微观动力学机制，讨论了超声波对无机垢体的破碎、超声空化、超声摩擦、超声蠕动输送作用以及超声造缝和增透效果。
