大功率超声波近井处理无机垢堵塞技术

Technology of removing near wellbore inorganic scale damage by high power ultrasonic treatment

利用自主研制的波场采油动态模拟室内实验装置和人工岩心碳酸钙无机垢堵塞样品,系统研究了超声波解除岩心无机结垢堵塞的整体效果及关键的波场参数、工艺参数和岩心物性参数对解堵效果的影响规律,同时系统分析了超声波解堵的主要动力学机制,在此基础上利用自主研制的新型超大功率超声波矿场施工装置进行了现场试验。研究结果表明,换能器频率、换能器功率、超声处理时间、岩心初始渗透率均影响超声波解堵效果。换能器频率、功率增加,解堵效果变好;累计处理时间80～120min解堵效果最好;岩心初始渗透率越高解堵效果越好。经陕北低渗油藏与大庆油田矿场试验验证,增产增注效果显著,证实了室内实验结果的合理性。

The effects of ultrasonic treatment and the influence of ultrasonic parameters,process parameters and core physical parameters on the results of ultrasonic treatment for removal of near wellbore inorganic scale damage were studied using the self-developed dynamic simulation experimental apparatus of fluctuating oil extraction technology and the artificial cores damaged by inorganic scale.The fundamental dynamical mechanism of ultrasonic treatment was also discussed.On the basis of the study,field experiments were conducted with the self-developed high power ultrasonic construction equipment.The results showed that transducer frequency,transducer power,ultrasonic processing time and core initial permeability all influence the plugging removal effect.The plugging removal effect gets better with the increase of transducer frequency and power.The optimal processing time is about 80-120 min.Field tests carried out in low permeability reservoirs in northern shaanxi and in the Daqing Oilfield showed that ultrasonic treatment can increase the production and injection remarkably,confirming the laboratory results.