考虑不可及孔隙体积的聚合物驱压力响应

Pressure Response in Polymer Flooding Reservoir Considering Inaccessible Pore Volume

聚合物溶液在地层中存在多种效应,采用以聚合物流变实验为基础,同时还考虑聚合物溶液在地层中存在扩散、对流和不可及孔隙体积作用的粘度模型,以此建立多因素影响下的聚合物驱试井解释模型,采用迭代法对非线性数学模型进行了数值求解,研制了典型曲线图版,典型曲线存在3个流动段。研究表明,考虑扩散、对流和不可及孔隙体积因素影响的典型曲线上翘幅度大于只考虑扩散和对流因素影响的典型曲线;不可及孔隙体积系数越大,曲线上翘幅度越大。

Various factors are existing in polymer flooding reservoir.A viscosity model of polymer solution is established in this paper based on rheology and considering physical and chemical mechanisms of diffusion,convection,inaccessible pore volume.A well test model is established by this new viscosity model.Numeric iteration method is adopted to acquire numerical solutions of the model.The type curve shows three flow regions.The results indicate that the type curve turns upward higher with considering the inaccessible pore volume(IPV),dispersion and convection than only considering dispersion and convection.The type curve turns upward more obvious with inaccessible pore volume increasing.