摘要
聚合物驱后剩余油分布更加分散,认识其形成机理和形态分布是进一步提高采收率的关键。采用数值模拟技术,按照聚合物驱后剩余油的成因,将剩余油划分为岩性变化剧烈型、层间干扰型、局部高点型、厚油层顶部型、压力平衡滞留区型等5种模式,并提出了不同模式的定量计算方法。分析结果表明,聚合物驱后主要剩余油成因类型为"厚油层顶部型"和"压力平衡滞留区型",聚合物驱在注聚阶段主要是以"调剖"机理为主,在含水恢复阶段和后续水驱阶段都是以"增加平面波及面积"机理为主;相对于"虚拟水驱开发",聚合物驱主要在含水恢复阶段大幅提高原油采收率。
In view of the fact that remaining oil distribution becomes more dispersed after polymer flooding,study on its formation mechanism and morphologic distribution is the key to enhance oil recovery.Based on the cause of remaining oil distribution after polymer flooding,five models,such as the region of lithologic change,the region of interlayer interference,local high point,the top of the thick oil layer and the retained region caused by pressure balance,are established through reservoir simulation technology.Meanwhile,quantitative calculation method of different models are put forward.It is indicated that the main models of remaining oil distribution after polymer flooding are the top of the thick oil layer and the retained region caused by pressure balance.Moreover,the main mechanism of polymer flooding is profile adjustment during polymer injection period,and increasing sweep area is the primary mechanism during water-cut restoring period and subsequent water flooding period.Compared with suppositional water flooding,the main response stage of polymer flooding to enhance oil recovery is the water-cut restoring period.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第3期107-111,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家“863”项目(2007AA06Z216)
国家自然科学基金项目(10972237)
国家科技重大专项(2008ZX05011)
中国博士后科学基金(20080440058)
关键词
聚合物驱
剩余油分布
成因模式
提高采收率
数值模拟
polymer flooding
remaining oil distribution
genetic model
enhanced oil recovery
numerical simulation
