Xu Xianzhen, Bao Terigen
College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles, Laboratory of Fiber Materials and Modern Textile, Qingdao University, Qingdao 266071, China.
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110000, China.
Ultrason Sonochem. 2020 Jun;64:104918. doi: 10.1016/j.ultsonch.2019.104918. Epub 2019 Dec 4.
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.
在原油开采过程中，常出现因沥青质沉积导致的近井地带堵塞。这会降低储层的孔隙度和渗透率，严重影响油气的运移和开采。本文研究了利用声化学方法去除因沥青质沉积造成的近井地带堵塞。使用六个不同参数的PTZ换能器来研究解堵效果。结果表明，用于解堵的最佳超声频率和功率分别为20kHz和1000W。研究发现，在超声功率恒定时，较低的超声频率有利于去除沥青质沉积堵塞；随着换能器功率的增加，去除沥青质沉积堵塞的效果变好，超声功率能够很好地弥补因频率增加而导致的超声能量衰减；无论使用何种类型的换能器，对于三种具有不同初始气测渗透率的岩心，去除沥青质沉积堵塞的效果均变差；随着超声处理时间的进一步增加，三种岩心样品去除沥青质沉积堵塞的效果均先变好然后趋于稳定；考虑到降低建设成本和保护油藏，与化学注入相比，超声处理具有许多无可比拟的优势，如适应性强、成本低、操作简单、无污染且有利于油田的可持续发展；受超声与化学剂协同效应的影响，超声与化学剂的联合处理效果明显优于单独使用超声或化学剂。
