聚合物驱复合油藏试井模型与典型曲线

Well test model and type curves of composite reservoirs with polymer flooding

考虑了聚合物溶液在地层中存在扩散、对流和不可及孔隙体积等物化作用,建立了聚合物驱复合油藏试井模型,通过有限差分算法对数学模型进行了数值求解,研制了典型曲线图版.研究表明:典型曲线存在5个流动段,聚合物溶液初始浓度越大,过渡段和内区径向流段上翘幅度越大;外区原油黏度越大,两区共同作用段上翘幅度越大;内区半径越大,不可及孔隙体积系数越小,内区径向流持续时间越长,内外区过渡段出现越晚.

A well test model of composite reservoirs with polymer flooding was established after considering diffusion,convection,and inaccessible pore volume.Finite difference method was adopted to acquire the numerical solution.Result shows that the type of curve has five flow sections.With the increasing of the initial concentration of polymer solution,the transition and the radial flow sections of the pressure derivative curve move upward obviously.With higher oil viscosity,the combined section shows bigger upturned amplitude.The duration of the radial flow is prolonged and the inner to outer transition is postponed with increasing the inner radius and decreasing the inaccessible pore volume.