低渗透油藏气水交替驱数值模拟研究

Numerical Simulation of Water Alternating Gas Injection in Low Permeability Reservoir

吉林油田某区块低阻低渗,纵向非均质性严重,是典型的低渗透砂岩油田。结合该区块的地质特征和注水开发生产历史,应用油藏数值模拟软件,采用单因子变量法,研究注入方式及注入参数等因素对低渗透油藏开发效果的影响。结果表明,最佳的注入方案为注气180 d后转注水180 d的气水交替的注入方式,注入周期为1 a,气水比为1:1,注气速度为10 000 m3/d左右。

The study area in Jilin oilfield is a typical low permeability sandstone oilfield with low resistance and serious vertical heterogeneity. According to the actual geological characteristics and water flooding production history, numerical reservoir simulation software was used to research the influence of injection methods and parameters on development effect of low permeability reservoir. The results show that, the best solution is water injection for 180 days alternating gas injection for 180 days, with gas water ratio of 1：1 and gas injection rate of 10 000 m3/d, which lasts for a period of one year.