气顶边水油藏剩余油分布模式及挖潜对策

针对国外某气顶边水油藏地质特征和开发状况,开展了剩余油分布规律研究,分析了影响剩余油分布的主控因素,即隔夹层、气顶、构造高点、井网和井型。在此基础上,总结出剩余油的分布模式,纵向分布模式为屋脊油、屋檐油、屋顶油和屋内油4种,平面分布模式为朵状和火山锥状剩余油2种。针对不同模式剩余油提出了相应的挖潜对策:屋脊油可以在顶部钻水平井挖潜,屋檐油宜采用水平井底部挖潜,屋顶油建议采用过路井补孔,屋内油采用水平井或直井加密挖潜;开发朵状剩余油应进一步完善井网,采用水平井挖潜底部剩余油,而火山锥状剩余油宜采用局部直井加密开发。

The nodes of remaining oil and development strategies in gas cap and edge water reservoir

According to the geological characteristics and development status of gas cap and edge water reservoir,the study on distribution law of remaining oil is carried out,and five dominate factors which have the main influence on the formation of remaining oil are presented,and the dominate factors are lens reservoir,structural high point,gas cap,interlayer,well pattern and well type,etc.Based on the dominant factors of remaining oil,the distribution modes of remaining oil are developed.There are four distribution modes in vertical direction;roof oil,eaves oil,ridge oil,room oil,and there are two distribution modes in the plane; cloud remaining oil and volcanic cone remaining oil.The developed strategies are also presented corresponding to the distribution modes of remaining oil.In vertical direction,the roof oil can be developed by drilling horizontal wells at the top of reservoir,the eaves oil can be developed by drilling horizontal wells at the bottom of reservoir,the ridge oil can be developed by perforation of pass by wells,and the room oil can be developed by infilling horizontal well;In the plane,the cloud remaining oil can be developed by improving well pattern,and using horizontal well to exploit bottom remaining oil,the volcanic cone remaining oil can be developed by drilling wells at remaining oil enriched area.