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模拟渗透率０～５０×１０－３μｍ２范围内的低渗透、特低渗透油藏，选取天然岩心和人造岩心进行了室内渗流实验．研究了低渗透油藏启动压差的形成机理及变化规律、非达西流动的产生条件及其渗流规律，并建立起３类流体非线性渗流时的流动方程．结果表明：低速非线性渗流是客观存在的，渗流曲线呈现非线性关系，渗流方程由非线性和线性组合而成
The low permeable and ultra-low permeability reservoirs with simulated permeability in the range of 0-50 × 10-3μm2 were selected for natural seepage and artificial core for indoor seepage experiment. The formation mechanism and variation of pressure drop in low permeability reservoirs, the generation conditions of non-Darcy flow and its percolation law are studied. The flow equations of three kinds of fluids in non-linear seepage flow are established. The results show that low-velocity non-linear seepage is objective and seepage flow shows a nonlinear relationship. Seepage equation is composed of nonlinear and linear combination