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为了研究管道蜡沉积物蜡晶形态与结构强度的关系,室内制备了不同含蜡比例的胶凝油,模拟现场管道蜡沉积物。借助软件Image J对不同实验条件下拍摄的胶凝油蜡晶显微图像进行处理,确定40℃是该实验蜡晶显微图像的拍摄温度。结果表明:随着胶凝油含蜡量的增大,蜡晶颗粒数与面积分数增大,蜡晶圆度也增大,同时长径比减小,且长径比集中分布在1.50~2.00的数值范围内,表明大部分蜡晶形态呈现长棒状。此外,结合胶凝油的屈服应力特性测试,分析蜡晶形态与其结构强度之间的关系得出:随着含蜡量的增大,蜡晶的边界盒维数增大,屈服应力也随之增大。由此可知:胶凝油内部的蜡晶形态差异是导致其结构强度随含蜡量变化的根本原因,研究结果为今后原油管道的清管工作提供了技术支持。
In order to study the relationship between wax crystal morphology and structural strength of pipeline wax deposits, gelled oil with different wax content was prepared indoors to simulate the pipeline wax deposits in the pipeline. With the aid of software Image J, the gelled oil wax microscopic images taken under different experimental conditions were processed to determine the temperature at which 40 ℃ is the experimental wax crystal microscopic image. The results show that with the increase of the content of wax in the gelled oil, the number of wax particles and the area fraction increase, the crystallinity of the wax also increases, while the aspect ratio decreases and the aspect ratio is concentrated in the range of 1.50 ~ 2.00 Of the numerical range, indicating that most of the wax crystal morphology showed a long rod. In addition, the relationship between wax crystal morphology and its structural strength was analyzed based on the yield stress characteristics of the gelled oil. The results showed that with the increase of the wax content, the boundary box dimension increased and the yield stress also followed Increase. It can be seen that: the wax crystal morphology in the gelled oil is the fundamental reason that causes the structural strength to change with the amount of wax content. The results provide technical support for the future pigging of crude oil pipelines.