QHD32-6油田N2泡沫驱高温高压可视化实验研究

利用高温高压可视化填砂管,研究了静态和动态条件下N2泡沫驱油过程中原油与泡沫的流动规律及其驱油机理,并对QHD32-6油田N2泡沫驱泡沫体系进行优化.实验结果表明：压力的增大有利于更多N2溶入原油中,使原油黏度下降,有利于原油的采出;随温度升高,N2泡沫在填砂管模型中的封堵作用逐渐减弱.在90℃下,N2泡沫体系仍具有较高的阻力因数,说明该体系具有良好的耐高温性能.随注入速度的增加,泡沫产生的阻力因子增大;但压力过大容易形成气窜影响采收率,因此,应将注入速度控制在1～2 mL/min.

Visualization studies on nitrogen-foam flooding experiment under high temperature and high pressure of QHD32-6 oilfield

The high temperature and high pressure visualized sand pack was applied to study the flowing laws and microscopic mechanism of oil displacement for crude oil and foam under static and dynamic situations during the process of N2foam flooding,and the foam system of nitrogen-foam flooding of QHD32-6 oilfield was optimized.The experiment results showed that the increase of pressure could be beneficial to more nitrogen dissolving in crude oil,which made viscosity of crude oil decrease and facilitated oil production.With the increasing of temperature,the plugging effect of nitrogen-foam in the sand pack model became worse step by step.However,the nitrogen-foam system still had a higher resistance coefficient at 90℃,which indicated that the nitrogen-foam system had good performance of high temperature resistance.With the increasing of injection rate,the resistance factor generated by foam also increased.However,high injection rate would cause gas channeling,and therefore,the injection rate should be controlled within a reasonable range of 1-2 mL/min.