Near-well blockage caused by asphaltene deposition often occurs during the process of crude oil exploitation. It can reduce the porosity and permeability of reservoirs and seriously affects the migration and exploitation of oil and gas. In this paper, removing near-well blockage caused by asphaltene deposition using sonochemical method is investigated. Six PTZ transducers with different parameters are used to study the deplugging effect. Results show that the optimal ultrasonic frequency and power for plugging removal are 20 kHz and 1000 W respectively. it is found that lower ultrasonic frequency is good for asphaltene deposition plug removal when ultrasonic power is constant; as the power of the sensor increases, the effect of removing the asphaltene deposition plug gets better, ultrasonic power can well make up for the attenuation of ultrasonic energy caused as frequency increases; the effects of removing asphaltene deposition plug for the three cores with different initial gas logging permeability all get worse no matter what type of transducer is used; the effect of asphaltene deposition plug removal for the three cores samples all become better and then tend to be stable as ultrasonic treatment time increases further; considering of reducing construction cost and oil reservoir protection, ultrasonic processing has a lot of unexampled advantages compared with chemical injection, such as good adaptability, low cost, simple operation, non-pollution and benefit for the sustainable development of oil field; affected by the synergistic effect of ultrasonic and chemical agents, the combined treatment effect of ultrasound and chemical agents is significantly better than using ultrasound or chemical agents alone.

中文翻译：

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声化学法去除沥青质沉积引起的近井堵塞的研究。

在原油开采过程中，经常发生由沥青质沉积引起的近井堵塞。它会降低储层的孔隙度和渗透率，并严重影响油气的运移和开采。本文研究了采用声化学方法消除沥青质沉积引起的近井堵塞。使用六个具有不同参数的PTZ传感器来研究去插效果。结果表明，去除堵塞的最佳超声频率和功率分别为20 kHz和1000W。发现在超声功率恒定的情况下，较低的超声频率有利于沥青质沉积物的去除。随着传感器功率的增加，去除沥青质沉积塞的效果会更好，超声波功率可以很好地弥补随着频率增加而引起的超声波能量的衰减；不论采用哪种换能器，对于初始气测渗透率不同的三个岩心，去除沥青质沉积塞的效果都会变差。随着超声波处理时间的进一步增加，三个岩心样品的沥青质沉积塞去除效果均趋于良好，然后趋于稳定。考虑到降低施工成本和保护油层，超声处理与化学注入相比具有许多无与伦比的优势，适应性好，成本低，操作简单，无污染，有利于油田的可持续发展。受超声波和化学试剂的协同作用的影响，