弱凝胶调驱降维数值模拟方法研究

目前用于弱凝胶调驱的化学驱软件大多存在计算速度慢、数值弥散现象严重的问题,为了提高弱凝胶调驱数值模拟的速度和精度,提出了降低维数的模拟方法。利用追踪流线的方法,将弱凝胶调驱的三维渗流问题,转化为沿流线计算饱和度的一维问题,大大降低了求解饱和度方程组中方程的数目,从而提高了计算速度。利用该方法,模拟了玉门老君庙油田一个试验井区的水驱开发历史,优化了弱凝胶调驱的注入浓度、注入速度及注入体积等参数,并预测了弱凝胶调驱的动态,预测该方案可提高采收率7.6%。

A new method of de-dimensional numerical simulation for weak gel driving

At present,most of the chemical simulators for weak gel driving have some critical drawbacks,such as low calculation speed,numerical dispersion.In order to improve the calculation speed,and enhance the calculation precision,this paper presents the de-dimensional numerical simulation methods.And then with the Time of Flight method,the three dimen- sional model for weak gel driving is decomposed into a series of one dimensional streamline model,along which the fluid satura- tion can be calculated.Therefore,this method can greatly reduce the order of equation group for saturation calculation,which can enhance the calculation speed.Based on the methods above mentioned,the paper simulated the water flooding of a pilot block,Laojunmiao oilfield,and optimized such parameters as injection concentration,injection rate and injection volume.Final- ly,the paper predicted the production performance of weak gel driving.It is indicate that the incremental ultimate oil recovery is 7.6%.