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Non-Darcy flow in oil accumulation (oil displacing water) and relative permeability and oil saturation characteristics of low-permeability sandstones

查看全文 作　　者：Zeng [1,2]Jianhui;Cheng [1,2]Shiwei;Kong [1,3]Xu;Guo [1,2]Kai;Wang [1,2]Hongyu 高影响力作者 机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;[2]School of Natural Resources and Information Technology, China University of Petroleum, Beijing 102249, China;[3]CNPC Greatwall Drilling Company, Beijing 100101, China高影响力机构 出　　处：《Petroleum Science》索引2010年第7卷第1期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation Project (No.40772088);the National Basic Research Program ('973' Program,Grant No. 2006CB202305) 摘　　要：Hydrocarbon resources in low-permeability sandstones are very abundant and are extensively distributed. Low-permeability reservoirs show several unique characteristics,including lack of a defi nite trap boundary or caprock,limited buoyancy effect,complex oil-gas-water distribution,without obvious oil-gas-water interfaces,and relatively low oil(gas) saturation. Based on the simulation experiments of oil accumulation in low-permeability sandstone(oil displacing water) ,we study the migration and accumulation characteristics of non-Darcy oil flow,and discuss the values and influencing factors of relative permeability which is a key parameter characterizing oil migration and accumulation in low-permeability sandstone. The results indicate that:1) Oil migration(oil displacing water) in lowpermeability sandstone shows non-Darcy percolation characteristics,and there is a threshold pressure gradient during oil migration and accumulation,which has a good negative correlation with permeability and apparent fluidity;2) With decrease of permeability and apparent fluidity and increase of fluid viscosity,the percolation curve is closer to the pressure gradient axis and the threshold pressure gradient increases. When the apparent fluidity is more than 1.0,the percolation curve shows modifi ed Darcy flow characteristics,while when the apparent fluidity is less than 1.0,the percolation curve is a 'concaveup' non-Darcy percolation curve;3) Oil-water two-phase relative permeability is affected by core permeability,fluid viscosity,apparent fluidity,and injection drive force;4) The oil saturation of lowpermeability sandstone reservoirs is mostly within 35%-60%,and the oil saturation also has a good positive correlation with the permeability and apparent fluidity. 关 键 词：低渗透砂岩储层 含油饱和度 油气水界面 非达西流 渗透性 积累 启动压力梯度 流动特性
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