油田注水系统无机垢的形成动力学研究

发布时间：2018-02-26 04:24

本文关键词： 注水系统无机结垢结垢趋势配伍性动力学　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：结垢是油田注水开采过程中非常严重的问题之一,受压力、温度的变化以及热力学不稳定性的影响,成垢离子在流动过程中结晶沉淀。结垢过程比较复杂,现阶段的实验研究主要侧重于热力学分析,因此,研究注水系统无机垢形成动力学对油田结垢过程预测准确性的提高和防止危害的发生具有重要作用。本文采用离子色谱法、滴定法、分光光度法分析油田水中的离子。使用结垢趋势预测模型Oddo-Tomson饱和指数法和饱和系数法预测油田水的结垢。Oddo-Tomson饱和指数法结垢预测准确性优于饱和系数法。在不同温度、pH值、压力、流速条件下,通过离子色谱法和滴定法测定模拟油田水成垢离子浓度,确定多组分结垢竞争性,得出无机垢结垢过程的动力学方程。拟合出的结垢动力学方程为y=y+Ae。温度对反应速率有促进作用,升高温度有助于生成碳酸钙垢。pH值越大越容易形成碳酸盐垢,一般情况下,当pH值小于7时,抑制结垢;pH值大于7时促进结垢。流速在0.726m·s-1时结垢严重。增加压力对油田水结垢趋势有一定的抑制作用。
[Abstract]:Scaling is one of the most serious problems in the process of oilfield water injection production. Due to the changes of pressure, temperature and thermodynamic instability, the scaling ions are crystallized and precipitated in the flow process. The present experimental research is mainly focused on thermodynamic analysis. Therefore, the study of inorganic scale formation kinetics in water injection system plays an important role in improving the prediction accuracy of scale formation process in oil field and preventing the occurrence of harm. Titration, The accuracy of scale prediction of oilfield water by Oddo-Tomson saturation index method and saturation coefficient method is better than that of saturation coefficient method. Under the condition of flow rate, the concentration of scale-forming ions in simulated oilfield water was determined by ion chromatography and titration, and the multicomponent scaling competition was determined. The kinetic equation of inorganic scaling process is obtained. The fitted kinetic equation of scaling is yy Ae. The temperature can promote the reaction rate, and increasing the temperature is helpful to the formation of calcium carbonate scale. The higher pH value is, the easier the carbonate scale is, in general, the higher the temperature is, the easier it is to form carbonate scale. When the pH value is less than 7:00, the inhibition pH value is greater than 7:00 to promote scaling. When the flow rate is 0.726 m 路s ~ (-1), scaling is serious. Increasing the pressure can inhibit the scaling trend of oilfield water to some extent.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.6

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