摘要：

采用在线显微成像及统计分析技术手段,设计模拟油田注水系统的动态条件下金属材料表面硫酸钡的结垢规律。并借助AFM及SEM技术分析结垢状况及程度随时间的变化规律。结果表明,高温高流速下硫酸钡结垢程度最大,管壁粗糙度越大,结垢越严重。对于BaSO4垢,在实验速度为1.2 m/s时处于一种过渡状态,此时晶核生长和流体的冲刷破坏达到动态平衡。在80℃,1.97 m/s流速下最容易形成致密的垢层,形成稳定垢层需要的时间为900 s。

关键词: 油田注水, 硫酸钡, 结垢机理, 动态监测

Abstract:

By means of the on-line microscopic imaging technique and statistical analysis，the scaling regularity of BaSO₄ on metallic material surface under dynamic environment in the stimulated oilfield water injecting system has been designed. Furthermore，scanning electron microscopy (SEM) and atomic force microscopy (AFM) are used for analyzing the variations of the scaling status and extent with time. The results demonstrate that the scale is the most serious at high temperatures and flow velocities，and the coarser of the tube wall，the more serious of the tendency of the scale formation. Moreover，in the range of the experimental flow rate，1.2 m/s is in the transition state，and the growth of the crystal and the erosion of the fluid come to a dynamic equilibrium. The compact scale layer is prone to form at 80 ℃ and 1.97 m/s，and the time needed to form a stable scale layer is about 900 s.

Key words: oilfield injected water, BaSO₄, scaling mechanisms, dynamic monitoring

中图分类号: 

• TE357.6