聚合物驱复合模型试井分析方法

Well test analysis method of composite model by polymer flooding

郭辉 程时清 于海洋 王成龙 聂向荣 张贤松 冯国智

中国石油大学(北京）石油工程教育部重点实验室，北京 102249 中海油研究总院，北京 100027

MOE Key Laboratory of Petroleum Engineering, Petroleum University of China, Beijing 102249, China CNOOC Research Institute, Beijing 100027, China

文中考虑到地层中聚合物溶液存在剪切、扩散、对流等物化作用，建立了聚合物驱牛顿￣非牛顿及非牛顿￣牛顿油藏试井复合模型，采用有限差分算法对模型进行数值求解，绘制压力和压力导数双对数曲线图版。研究表明：聚合物驱油藏试井复合模型双对数曲线划分为5个流动段；牛顿￣非牛顿复合模型中，外区聚合物黏度越大，内区水相到外区聚合物溶液的过渡段上翘幅度越大，内区半径越大，水相径向流段时间越长，水相到聚合物的过渡段出现的越慢。非牛顿￣牛顿复合油藏中，聚合物溶液初始质量浓度越大，聚合物溶液的径向流段上翘的幅度也越大，内外区过渡段斜率减小，外区油相黏度越大，聚合物溶液到油相的过渡段上翘幅度越大。实例应用表明，新方法能准确确定两区油藏参数。

Considering the polymer solution in the presence of shear, diffusion and convection, the well test composite models of Newtonian-non-Newtonian and non-Newtonian-Newtonian by polymer flooding were established and finite difference method was employed to solve the mathematical model for typical curve. It shows that the typical curve of composite reservoir by polymer flooding has five flow sections. In the Newtonian-non-Newtonian composite model, the pressure derivative curves of transition section and the radial flow section obviously move upward with increasing of polymer viscosity. The duration of radial flow is prolonged and the transition section is postponed with increasing the inner radius. In the non-Newtonian-Newtonian composite reservoir, the higher the concentration of initial polymer solution is, the greater the magnitude upturned of inner radial flow section is, and the smaller the magnitude upturned of transition section is; the greater the oil viscosity is, the greater the magnitude upturned of transition section is. The field-test application shows that this new method can accurately evaluate reservoir characteristics.

10.6056/dkyqt201404023