摘要
针对渗吸法采油中的毛管力驱动项和流动系数的取值问题 ,根据地下流体渗流特征 ,建立了低渗透油藏渗吸法采油数学模型 ,给出了数值解法 .定量分析了渗吸法采油的主要影响因素 ,通过实例验证 ,用该方法计算的各项动态指标与矿场实际值符合程度较高 .结果表明 :基质与裂缝渗透率之比小于 0 .0 1,油水黏度比小于 15 ,毛管力较大的水湿油层比较适合于渗吸法采油 ,能够提高水驱采收率 2
We developed an oil recovery numerical model through imbibition method for hetergeneous sandstone reserviors on the basis of the features of fluids under the surface, and presented the numerical solution. The performance indexes calculated by this method have extensively been verified by comparisons with the field date and excellent agreement was obtained. Quantitative analysis has been made on these important factors that effect on oil recovery by imbibition method. The conclusion is that the oil recovery by imbibition method can apply for the ratio of the permeability of matrix versus that of fractures less than 0.01, the ratio of oil/water viscosity less than 15 and water-wetting reserviors with larger capillary pressure. This method can improve water flooding recovery by about 2%. But the disadvantages of the method are the low production rate and the long development periods.
出处
《大庆石油学院学报》
CAS
北大核心
2004年第2期31-33,共3页
Journal of Daqing Petroleum Institute
关键词
渗吸法采油
毛管力
数值模拟
流动系数
逆向渗流
低渗透油藏
imbibition oil recovery
capillary force
numerical simulation
flow coefficient
backward vadose
low permeability reservior
