不同润湿性条件下稠油热水驱微观驱油效果对比

Comparison of Micro-displacement Effect in Hot Water Flooding of Heavy Oil under Different Wettability Conditions

尽管润湿性是储层物性的重要参数,对驱油效果也有显著影响,但关于润湿性对稠油热水驱微观驱油效果的影响却很少进行研究。创建并采用稠油热水驱微观驱油效果定量评价新方法——"解-合"(cutout-flattent image)法,分别从微观波及系数、微观驱油效率和微观采收率三个方面对水湿和油湿模型中不同温度下的稠油热水驱微观驱油效果进行定量评价和对比。实验数据表明,油湿利于提高微观波及系数,较高温度下水湿利于提高微观驱油效率;较低温度下微观波及系数大于微观驱油效率对微观采收率的贡献,而较高温度下微观驱油效率的贡献较大。润湿性对微观采收率的影响不如温度显著,且受温度影响,但随着温度升高影响减小。

Although wettability is one important parameter of reservoir properties and also has a significant influence on displacement effect,there are few researches about influence of wettability on displacement effect in hot water flooding of heavy oil. A new evaluation method named ＂cutout-flattent image method＂has been produced to evaluate quantitatively micro-displacement effect of hot water flooding of heavy oil. Furthermore,using the method,micro-displacement effect including micro-sweep efficiency,micro-displacement efficiency and micro-recovery was evaluated quantitatively and compared. Experimental data shows that oil-wettability contributes to improving microsweep efficiency,water-wettability is in favor of increasing micro-displacement efficiency at higher temperature.Moreover,micro-sweep efficiency is more important than micro-displacement efficiency to contribute to micro-recovery at lower temperature,while micro-displacement plays a more important role to increase micro-recovery at higher temperature. Wettability is less significant than temperature to improve micro-recovery. Its effect has something to temperature and becomes reduced with the increase of temperature.