微泡沫在高温高盐油藏中的驱油作用

发布时间：2018-02-03 13:05

  本文关键词： 微泡沫驱 稳定性驱油机理 波及体积 高温高盐油藏　出处：《油田化学》2017年01期 　论文类型：期刊论文

【摘要】：针对普通泡沫在高温高盐油藏中稳定性弱、驱油效果差的问题,采用将气体和起泡剂溶液(5000 mg/L甜菜碱表面活性剂SL1+5000 mg/L黄原胶XG)同时注入填砂管泡沫发生器的方法制备了一种稳定性强、尺寸细微的微泡沫体系,即黄原胶稳定的微泡沫。通过微观可视化模型对比了普通微泡沫(5000 mg/L SL1)与黄原胶稳定的微泡沫在原油存在条件的下稳定性差异,分析了驱油机理,借助填砂管模型对比了两种微泡沫的驱油性能。微观实验结果表明:气泡液膜中吸附的黄原胶增加了微泡沫液膜厚度,有效抑制了气泡聚并和液膜排液,使黄原胶稳定的微泡沫具有更强的稳定性和耐油能力。微泡沫越稳定,微观波及体积越高、采油效率越高。微泡沫主要的驱油机理为直接驱替机理、乳化机理、同向液膜流动机理、逆向液膜流动机理。物模实验结果表明,在160 g/L矿化度、90℃条件下,黄原胶稳定的微泡沫驱的采收率可在水驱基础上提高22.9%,比普通微泡沫驱高15.2%。
[Abstract]:In order to solve the problem that the stability of common foam in high temperature and high salt reservoir is weak and the oil displacement effect is poor. The xanthan gum of gas and foaming agent solution of 5000 mg/L betaine surfactant SL1 5000 mg/L was used. At the same time, a kind of stability was prepared by injecting sand pipe foam generator. Micro foam system of fine size. Through the microscopic visualization model, the difference of stability between ordinary microfoam 5000 mg/L SL1 and Xanthan Gum stabilized microfoam under the condition of crude oil existence was compared with that of xanthan gum stabilized microfoam. The oil displacement mechanism was analyzed and the oil displacement performance of two kinds of microfoam was compared with the sand filled pipe model. The microscopic experimental results showed that the adsorption of xanthan gum in the bubble liquid film increased the thickness of the microfoam film. It can effectively restrain bubble aggregation and liquid film efflux, so that xanthan gum stabilized microfoam has stronger stability and oil resistance. The more stable the microfoam, the higher the microcosmic sweep volume. The oil recovery efficiency is higher. The main oil displacement mechanism of microfoam is direct displacement mechanism, emulsification mechanism, codirectional liquid film flow mechanism, reverse liquid film flow mechanism. At 90 鈩，

本文编号：1487464