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现有的相对渗透率计算公式是基于达西定律的 ,而低渗油层渗流为非达西类型。建立了低渗非达西渗流相对渗透率计算方法 ,导出了计算公式 ,并进行了非稳态流动实验。结果表明 :在低渗油藏相对渗透率曲线中 ,束缚水和残余油饱和度较高 ,两相渗流区范围较窄 ;随含水饱和度增大 ,油相对渗透率递减较快 ,水相对渗透率递增较慢 ;非达西渗流使油相相对渗透率增大 ,使水相相对渗透率减小 ,使产水率增大 ;油井见水后 ,产油量会迅速下降 ,水驱低渗油藏采收率不高。
The existing relative permeability calculation formula is based on Darcy’s law, while the seepage of the low permeability reservoir is non-Darcy type. The calculation method of relative permeability of non-Darcy seepage with low permeability was established, the calculation formula was derived, and unsteady flow experiments were carried out. The results show that in the relative permeability curve of low permeability reservoir, the irreducible water and residual oil saturation are higher, and the two-phase seepage area is narrower. With the increase of water saturation, the oil relative permeability decreases rapidly, and the relative water infiltration Non-Darcy seepage flow increases the relative permeability of the oil phase, so that the relative permeability of the water phase decreases, so that the water production rate increases; oil seepage, the oil production will rapidly decline, water flooding low permeability Oil recovery is not high.