石油勘探与开发2012，Vol.39Issue(3)：338-345,8.
高含水阶段重新认识水驱油效率
New understanding on water-oil displacement efficiency in a high water-cut stage
摘要
Abstract
Based on analyzing dominant internal and external factors affecting water-oil displacement efficiency, the variation of oil displacement efficiency is studied by means of experimental and theoretical analyses. Internal factors include reservoir heterogeneity (highlighted micro-pore structure heterogeneity) and wettability. External factors are waterflooding conditions, including pore volume multiplier of water injected, injection rate, and oil-water viscosity ratio. The variation mechanism is analyzed based on the definition, laboratory determination and field application of water displacement efficiency. A viewpoint is proposed that the changes of wettability and pore structure in a high water-cut stage would reduce the critical capillary number and the residual oil saturation, leading to improvement of water displacement efficiency. More attention should be paid to water-oil displacement efficiency when water-flooding oilfield enters a high water-cut stage. Research on water-oil displacement efficiency must be deepened from three levels as follows: the first is the definition of laboratory values, the second is to study economic and effective conditions for getting (reaching) a certain oil displacement efficiency, the third is how to develop cost-effective techniques to improve the displacement efficiency by increasing capillary number.关键词
水驱油效率/高含水阶段/注入孔隙体积倍数/临界毛管数/润湿性Key words
water-oil displacement efficiency/ high water-cut stage/ pore volume multiplier of water injected/ critical capillary number/ wettability分类
能源科技引用本文复制引用
纪淑红,田昌炳,石成方,叶继根,张祖波,傅秀娟..高含水阶段重新认识水驱油效率[J].石油勘探与开发,2012,39(3):338-345,8.基金项目
"十一五"国家重大专项课题"剩余油分布综合预测与层系井网重组技术"(2008ZX05010-003) （2008ZX05010-003）
"十一五"中国石油科技项目"高含水油田提高水驱采收率关键共性技术研究"(2008B-0801) （2008B-0801）
