低渗-特低渗油藏油水相对渗透率及水驱油效率影响因素研究

Study on Influencing Factors of Oil-water Relative Permeability and Water-flooding Efficiency in Low Permeability and Extra-low Permeability Reservoir

了解和掌握低渗-特低渗油藏的相对渗透率和水驱油规律,对于准确认识该油田区块流体渗流特征,合理、高效开发油田有着十分重大的意义。以鄯善油田特低渗储层为例,通过室内岩心实验,分析了不同因素对于低渗-特低渗油藏的油水相对渗透率和水驱油效率的影响。结果表明:岩心渗透率、原油黏度的变化都会影响低渗-特低渗油藏的油水相对渗透率曲线特征。同时,低渗-特低渗油藏的水驱油效率也会随着岩心渗透率、驱替速度和原油黏度的变化而变化。

The understanding and mastery of the law of oil-water relative permeability and water-flooding efficiency in low permeability and extra-low permeability reservoir is of signality to the accurately understand of the percolation characteristics of the reservoir, and can provide evidence for the scientifically developing of oilfields. The experimental study have been carried out by using the natural core from extra-low permeability reservoir of Shanshan 0ilfield. Based on the experiments, the influencing factors of oil-water relative permeability and water- flooding efficiency in low permeability and extra-low permeability reservoir have been studied. Results show that permeability and oil viscosity have influence on the character of oil-water relative permeability curve of low permeability and extra-low permeability reservoir. And the water-flooding efficiency will change by the change of the permeability, injecting rate and oil viscosity.