【作者】 陈雷； 刘刚； 徐贝贝； 张国忠；

【Author】 Lei Chen~1,Gang Liu~1,BeiBei Xu~2,GuoZhong Zhang~1 1.China University of Petroleum,Qingdao 266580 China 2.CNOOC Gas&Power Group,Beijing 100027 China

【机构】 中国石油大学(华东)油气储运工程系； 中海石油气电集团有限责任公司；

【摘要】 对原油动态剪切流动条件和温降条件下的蜡晶尺寸微观数据进行研究,观察不同剪切、温降条件下蜡晶颗粒的平均等积圆直径、圆度值的变化规律。通过控制相同的温降速率,变化剪切速率实验,发现表观黏度急剧增大的阶段,蜡晶颗粒的平均等积圆直径减小;通过静态温降对照实验,发现剪切条件下的蜡晶颗粒平均等积圆直径波动范围明显小于静态条件;通过变化温降速率实验,得出圆度值与表观黏度大小正相关。更多还原

【Abstract】 The wax crystals microstructure under conditions of waxy crude oil’ s shearing and cooling procedure is researched.Wax crystals ’ precipitation in various experiments was observed by digital microscopic imaging system.Average equal-area-circle diameter and roundness are two microscopic parameters statistic analyzed comprehensively in the process of the rheological experiments to describe the microstructure. It has been found that the average equal-area-circle diameter of wax crystals decreases when apparent viscosity increases sharply based on the experiments in different shear rate.By comparing with static cooling experiments,it is found that the fluctuation range of average equal-area-circle diameter under dynamic experimental conditions is less than the static conditions’.A positive correlation between the wax crystals’ roundness value and crude oil’ s apparent viscosity is found in different cooling rate experiments.更多还原