底水油藏水平井见水机理的物理和数值模拟研究

Physical and Numerical Simulation Research for Water Breakthrough Mechanism of Horizontal Well in Bottom Water Reservoir

底水油藏水平井见水机理的物理模拟实验中,底水易于点状锥进,可视化玻璃因应力集中而易炸裂。通过改进水平井可视化二维物理模拟实验装置,实现底水连续推进及全景可视化油水运动过程监测,实验结果反映了底水油藏水平井的见水特征。建立物理模拟实验模型尺度的数值模拟模型,模拟得到的结果与物理模拟实验有差异。通过在数值模拟软件中设置门限压力(THPRES)及采用交错循环设置法进行平衡分区,实现附加阻力在数值模拟中的等效处理,最后得到的模拟结果与物理模拟实验一致,在含水率、采出程度等指标上实现了较高精度的拟合。

In the physical simulation experiment on water breakthrough mechanism of horizontal well in bottom water reservoir,the bottom water is easy to cone and the visual glass is easy to crack due to stress concentration.By improving the visual two-dimensional physical simulation experiment device of horizontal well,the continuous advancing of bottom water and the panoramic visual monitoring of oil-water movement process are realized.The experimental results reflect the water breakthrough characteristics of horizontal well in bottom water reservoir.A numerical simulation model of horizontal well in bottom water reservoir with laboratory scale is established,and the results of numerical simulation are different from those of physical simulation.By introducing the threshold pressure(THPRES)and setting the equilibrium region withstaggered cycle method in the numerical simulation software,the equivalent treatment of additional resistance in the numerical simulation is realized.The final simulation results are consistent with the physical simulation experiments,and the indexes including water-cut and recovery degree are precisely fitted.