Dong Hang, Guo Nan, Zhang Pengfei, Zhao Jian, Wang Zhihua
Energy-Saving and Consumption-Reducing Laboratory, Surface Engineering Pilot Test Center of CNPC, College of Petroleum Engineering, Northeast Petroleum University Xuefu Street No. 99, Hi-tech Development Zone Daqing 163318 China
Daqing Oil Field Limited Liability Company Natural Gas Branch Production and Operation Department Daqing China.
RSC Adv. 2024 Apr 3;14(16):10884-10896. doi: 10.1039/d4ra00951g.
A rheo-microscopy synchronous measurement system was utilized to investigate the dynamic behavior of water droplets in W/O waxy crude oil emulsions subjected to dynamic cooling conditions, the microstructural evolution of water droplets aggregates can be categorized into three stages based on the various forms of wax crystals. The results show that under the joint action of wax crystals and water droplets, the water droplets aggregation trend and complexity in the system are negatively correlated with the changes of temperature and shear rate, and the water droplets movement behavior is positively correlated with the changes of temperature and shear rate. As the temperature decreases, the minimum edge distance of water droplets decreases by a maximum of 32.1%, the specific surface area (SA) decreases by a maximum of 12.0%, and the fractal dimension increases by a maximum of 11.7%. As the shear rate increases, the minimum edge distance of water droplets increases by up to 27.9%, the specific surface area (SA) increases by up to 10.1%, and the fractal dimension decreases by up to 8.5%. Additionally, an analysis is conducted on the collision aggregation behavior of water droplets in shear flow field based on population balance theory.
利用流变显微镜同步测量系统研究了动态冷却条件下W/O型含蜡原油乳液中水滴的动态行为，基于蜡晶的不同形态，水滴聚集体的微观结构演变可分为三个阶段。结果表明，在蜡晶和水滴的共同作用下，体系中水滴的聚集趋势和复杂性与温度和剪切速率的变化呈负相关，水滴的运动行为与温度和剪切速率的变化呈正相关。随着温度降低，水滴的最小边缘距离最大减小32.1%，比表面积（SA）最大减小12.0%，分形维数最大增加11.7%。随着剪切速率增加，水滴的最小边缘距离最大增加27.9%，比表面积（SA）最大增加10.1%，分形维数最大减小8.5%。此外，基于群体平衡理论对剪切流场中水滴的碰撞聚集行为进行了分析。
