热力泡沫复合驱提高稠油采收率研究

ENHANCED HEAVY OIL RECOVERY WITH THERMAL FOAM FLOODING

蒸汽驱开采稠油油藏时存在蒸汽超覆和蒸汽窜流,降低了蒸汽的波及效率。国内外采用注蒸汽的同时添加非凝析气体和耐高温起泡剂,进行热力泡沫复合驱,取得了令人满意的效果。利用物理模拟驱替实验和数值模拟技术,研究了热力泡沫复合驱提高稠油采收率的机理及开发效果。实验研究表明:蒸汽驱转热力泡沫复合驱后,驱油效率在蒸汽驱的基础上提高38.5%,达到81.0%。辽河高升油田的数值模拟研究表明:热力泡沫复合驱的采收率高于单一蒸汽驱,泡沫能够封堵蒸汽窜流通道,抑止蒸汽超覆,改善油藏的温度分布,是一种行之有效的三次采油方式。

Steam overlapping and steam channeling decrease sweeping efficiency of steam drive while steam-drive exploiting heavy oil reservoirs. Thermal foam drive, steam drive by adding non-condensing gas and high-temperature foaming agent, shows effective recovery performances in foreign and domestic researches and applications. The recovery efficiency of thermal foam drive with displacement experiment and numerical stimulation is researched. The results indicate thermal foam flooding effectively improves displacement efficiency of steam drive and the oil recovery efficiency increases 38.5% in the experiment, up to 81.0%. The numerical stimulation of Gaosheng block in Liaohe oil field shows that recovery efficiency of thermal foam drive is higher than steam drive. Foam can block steam channeling and decrease steam overlapping, improve temperature distribution in reservoirs and thermal foam drive is an effective EOR method.