关键词: 注水开发, 储集层, 渗透率, 孔隙度, 润湿性, 渗流规律, 动态变化, 华北油田

Abstract: Two hundreds and ninety two blocks of rock samples were selected from different micro-sedimentary facies in five main sandstone reservoirs during high water-cut production period in Huabei Oilfield.The changes of physical properties of reservoir in Huabei Oilfield were quantitatively studied,by using techniques of simulation tests in laboratory,sealed coring well analyses and tracer monitors.After long-term water flooding,the reservoir physical properties of meandering channels and the subaqueous channels were better.The permeability and the radius of porous throat were raised by 38 percent and 17 percent respectively.The drainage pressure and content of clay mineral were reduced by 23 percent and 24 percent respectively.The reservoir physical properties of the mouth bar and inshore beach bar have less changes after a long-term water flooding.The oil-water relative permeability curve changed,and the reservoir wettability changed from weak hydrophile to strong hydrophile.The permeability and radius of porous throat increased by 17 percent and 12 percent respectively,and the drainage pressure and content of clay mineral reduced by 11 percent and 17 percent respectively.The study result has been successfully applied to make the development and adjustment projects,select routine measures and design project for enhancing oil recovery of an oilfield during high water cut production stage.

Key words: waterflooding development, reservoir, permeability, porosity, wettability, seepage rule, dynamic variation, Huabei Oilfield