基于井间连通性的二元复合驱剂窜预警方法

Early warning method of chemical solution channeling in polymer and surfactant flooding based on interwell connectivity inversion

针对数值模拟技术进行剂窜预警具有模型构建复杂、计算速度缓慢、收敛性差等问题,提出一种二元复合驱剂窜的预警方法,从生产动态出发,对注采井间连通性进行反演,在此基础上结合流管法建立二元复合驱产剂质量浓度的预测模型,并采用解析法对模型进行求解。结果表明相比于传统数值模拟方法该方法具有计算简便、预警迅速的特点;该模型计算得到的产剂质量浓度可以较好地吻合数值模拟结果,模型具有可靠性,该方法可为改善低油价下二元复合驱开发效果、进一步挖潜油藏剩余储量提供技术支撑。

Numerical simulation is the main early warning method of chemical solution channeling at present,and it has the disadvantage of slow calculation,poor convergence,etc.A new early warning method was proposed in this paper.In this method,interwell connectivity was first obtained through an inversion method,and then a prediction model of chemical concentration in produced fluids was established according to the stream-tube method.The proposed model was solved analytically,and therefore,it was fast and convenient compared with the numerical simulation method.Model validation shows that the predicted chemical concentration matches well with that from the numerical simulation method.The proposed method is reliable and can be used to improve the performance of polymer and surfactant flooding and enhance oil recovery.