油田集输管道内流动流体结垢动力学研究

Fouling Kinetics Model of Flowing Fluid in Oil Gathering Pipeline

杨欢 罗跃 苑慧莹 陆梅 帅群

YANG Huan LUO Yue YUAN Huiying LU Mei SHUAI Qun

为揭示油田集输管道内的动态结垢过程，以CaCO3为例开展了圆管内动态结垢机理研究。从流体流动过程出发，自制结垢动态分析仪，采用脉冲示踪法测试管内流体流动形态，用电导率法测定CaCO3结垢反应速率常数，结合平均停留时间分布，建立结垢流体一维轴向分散模型。结果表明：CaCl2、Na2CO3水溶液比去离子水（空白）的混返过程明显；圆管内流动过程中CaCO3结垢的反应速率常数为0.025 L/（s·mol）；根据所建立的结垢管内流体轴向分散模型得到CaCO3垢的转化率为53.600%，与实验值的相对误差为5.438%。该模型可准确模拟圆管内流动流体结垢动力学过程，为防垢方案提供基础信息。图7 参17

In order to reveal the dynamic process of scaling in oil gathering pipeline，CaCO3 was typically introduced to explore the dynamic mechanism of scaling in circular pipes. Based on the fluid flow process，the flow patterns and reaction rate constant of CaCO3 scaling were measured by pulse tracing method and electrical conductivity method using homemade scaling dynamic analyzer. With the average residence time distribution，the one-dimensional axial dispersion model of scaling fluid was established. The results showed that the back mixing phenomenon of CaCl2 and Na2CO3 water solution was more obvious than that of deionized water（blank）. The rate constant of CaCO3 scaling during the process of flow in a circular tube was 0.025 L/（s·mol）. According to the established model，the conversion rate of CaCO3 scale was 53.600% . The relative error between calculated value and experimental value was 5.438%，indicating an accurate prediction for the developed dynamic model，which should provide basic information for scale prevention design in circular pipe.

10.19346/j.cnki.1000-4092.2016.06.032