特低渗透岩心相对渗透率实验研究

Experimental study on relative permeability of super-low permeability cores

室内实验研究表明,大庆油田扶杨油层特低渗透岩心气测渗透率越低,油水两相流动区范围越窄;残余油饱和度条件下的水相相对渗透率值总体比较低;水相相对渗透率曲线呈现凹向和凸向含水饱和度轴及反S型3种形式,这反映了特低渗透油藏水驱油过程中流体与流体、流体与介质之间相界面作用及变化诱导出流体渗流状态的多变性和复杂性。

Experimental study indicates that, for super-low permeability cores from Fuyang reservoir of Daqing Oilfield, the lower the gas logging permeability is, the smaller the oil-water two-phase flowing zone is; the relative permeability of water phase is generally low under residual oil saturation; the relative permeability curves of water phase present 3 types, i.e. concave and convex water saturation axes and reversed S-shape, reflecting the polytropy and complexity of fluid filtration resulted from phase interface action and changes between fluid and fluid as well as fluid and media in super-low permeability reservoir during waterflooding process.