底水油藏水平井水淹动态的数值模拟研究

A Numerbical Simulation Study on Water Flooding Performance and Pattern in Horizontal Well with Bottom Water Reservoir

针对多数底水油藏水平井水淹动态规律研究未考虑井筒压降的情况,在探讨考虑井筒压降必要性的基础上,利用数值模拟方法,研究考虑井筒压降时不同因素影响的水淹动态规律。结果表明:见水时间和无水期采油量随水平井产量的变化呈幂指数关系,随水平段长度的增加呈线性增加,随油层厚度的增加呈现"上翘"的非线性关系;隔夹层渗透率对水淹规律的影响只表现为完全不渗透隔夹层和无隔夹层,不存在半渗透隔夹层;当隔夹层的长度大于水平井筒长度时,隔夹层面积越大抑制底水脊进的效果越好。

Most studies did not take the wellbore pressure drop into account about the flooding pattern on horizontal wells in bottom water reservoir,on the basis of the necessity to consider the pressure drop of the wellbore,numerical simulation method is utilized to study on water flooding performance and pattern considering wellbore pressure drop under different factors on horizontal well in bottom water reservoir. The results show that:water breakthrough time and cumulative water-free oil production is exponentially related to horizontal well production,and shows linear change with increase of horizontal length, shows an " upturned " non-linear relationship with the increase of reservoir thickness. The effect of interlayer permeability on water flooding performance and pattern only reflects as completely impermeable interlayer and non-interlayer,there is no semipermeable interlayer. The bigger interlayer area,the better it is in restraining the water cresting when interlayer is longer than horizontal well.