摘要
为厘清哈得逊油田东河砂岩微观剩余油形成机理及三次采油的方向,利用岩心扫描电镜、铸体薄片、CT扫描及压汞测试等方法,在哈得逊油田东河砂岩微观非均质级次研究的基础上,通过微观刻蚀薄片水驱油实验和真实岩心水驱油CT扫描研究油水运动状态及微观剩余油形成机理。结果表明:研究区微观非均质性从级次上分为单一孔喉级、局部孔喉组合级与岩心孔喉连通级。油田生产压差形成的动力与毛细管力、黏滞力构成的阻力,以及注入水沿着孔喉中央的驱替速度与沿着孔喉表面的剥离速度的相对大小控制了油水的运动。微观剩余油形成机理为单一孔喉的孔内贯穿作用、润湿捕集作用、角隅滞留作用,局部孔喉组合的旁超作用、指进作用,以及岩心内部的窜流作用。指进作用造成的斑块状剩余油及窜流作用形成的连片富集型剩余油是研究区后期挖潜的重点。
In order to clarify the micro-remaining oil formation mechanism and the direction of tertiary oil recovery in Donghe sandstone in Hadeson oilfield.Based on the combination of scanning electronic microscope,casting slices,core CT scanning and mercury injection data,the microscopic heterogeneous grade of Donghe sandstone in Hadeson oilfield was investigated,and the formation mechanism of microscopic remaining oil was revealed by the analysis of oil and water movement state as well as displacement models experiments of CT scanning and micro etching.It is concluded that the microscopic heterogeneity of the study area is divided into single pore-throat level,partial pore-throat combinations level and pore-throat connectivity of a core sample level.The oil and water movement state are controlled by the relative size of driving force that composed of production pressure drop and resistance power that included capillary and viscous force,and displacing velocity along the center of pore throat and stripping velocity along the surface of pore throat.The formation mechanisms of microscopic remaining oil include the penetration、wetting trapping and cornering retention effect in a single pore-throat,the side surpass and fingering effect in partial pore-throat combinations,the breakthrough flow effect in a core sample.The plaque remaining oil caused by side surpass effect and flake enrichment remaining oil gave rise to breakthrough flow effect is the main target for the later exploitation.
作者
余义常
徐怀民
郭睿
江同文
孙廷彬
李峰峰
YU Yi-chang;XU Huai-min;GUO Rui;JIANG Tong-wen;SUN Ting-bin;LI Feng-feng(Petrochina Research Institute of Petroleum Exploration and Development Beijing 100083,China;College of Geosciences,China University of Petroleum(Beijing) Beijing 102249,China;Tarim Oilfield Company, PetroChina Korla 841000,China;Zhongyuan Oil Company,SINOPEC Puyang 457001,China)
出处
《科学技术与工程》
北大核心
2018年第28期72-79,共8页
Science Technology and Engineering
基金
国家科技重大专项(2011ZX05009-003
2017ZX05030-001)资助
关键词
东河砂岩
微观非均质级次
油水驱替实验
微观剩余油
形成机理
Donghesandstone
microscopicheterogeneitylevel
oil-waterdisplacementexperimentmicroscopicremainingoil
formationmechanism
