摘要
使用长岩心渗流试验装置 ,模拟油藏条件开展微凝胶体系动态成胶和驱油试验 ,研究了低浓度微凝胶体系在长岩心填砂模型中的动态成胶特征、流动特性和驱油效果。试验结果证明 :低浓度微凝胶体系在通过长岩心的流动过程中能够形成一定强度的微凝胶 ,产生的流动阻力比相同浓度甚至高浓度聚合物溶液高 ;微凝胶体系在岩心内部成胶后 ,具有良好的流动性和传播性 ,在后续水驱过程中 ,仍然保持较高的剩余流动阻力。低浓度微凝胶溶液在动态成胶过程中具有明显的驱油作用 ,可以较大幅度提高石油采收率 ,但微凝胶驱的增油效果主要出现在后续水驱阶段。
In-situ gelling and flooding experiments for micro-gel system were performed in long-core sand-packs to study its gelling behavior under flowing condition. The experimental results showed that low concentration Cr +3 /HPAM polymer system did form a micro-gel which is mobile and could penetrate deeply into porous media. The flow resistance of micro-gel system is much higher than that of polymer solution at higher concentration, and residual resistance remains relatively high during the post-flooding period. Micro-gel flooding experiment has shown a significant increase in oil recovery, but incremental oil was mainly produced in post-flood duration.
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2003年第3期162-163,169,共3页
Chemical engineering of oil & gas
