温度对稠油油藏油水相对渗透率影响规律的实验研究

Experimental study on effect of temperature on oil-water relative permeability in heavy oil reservoir

为研究温度对稠油油藏油水相对渗透率的影响规律,选用委内瑞拉某区块稠油,配制实际油藏条件下的含气原油,基于一维岩心流动模拟实验,在考虑油藏条件下,采用非稳态法测定不同温度下的油水相对渗透率曲线。研究结果表明,稠油油相相对渗透率较大,水相相对渗透率极小,油水两相渗流能力极不平衡;随着温度的升高,束缚水饱和度呈线性增加,残余油饱和度呈非线性减小,等渗点对应的含水饱和度呈幂指数增加,相对渗透率曲线整体右移,两相共渗区域扩大,油水两相相对渗透率均增大,水相上升幅度小于油相。

In order to research the effect of temperature on oil-water relative permeability in the heavy oil reservoir,theheavy oil from a block in Venezuela was prepared as gas-bearing oil under simulated reservoir conditions. Oil-water relative permeability curves at different temperatures were determined through the unsteady-state method based on one-dimensional core flow simulation experiment. Research results show that the relative permeability of the heavy oil for the oilphase is high and very low for the water-phase,and the flow capacity between oil and water is extremely imbalanced. Along with the rise of temperature,the irreducible water saturation increases linearly and the residual oil saturation decreases nonlinearly,while the saturation corresponding to the equal-permeability point increases exponentially. The overall relative permeability curve shifts to right with increasing temperature. Furthermore,the imbibition area is enlarged and the oil and water relative permeability increases,but the rising amplitude of water was less than that of oil.