聚合物驱增油量评价方法及应用

Study on calculation for polymer flooding incremental oil

确定聚合物驱增油量是油田聚合物驱效果评价和经济效益分析的关键。目前常用的聚合物驱增油量评价方法中以产量递减分析法应用最为广泛,但当聚合物驱开发过程中伴随提液措施时,该方法计算的增油量误差很大。提出了考虑提液影响的产量递减分析方法,并与数值模拟方法计算增油量结果进行了对比,考虑提液影响的产量递减分析方法计算聚合物驱增油量误差为2.99%,精度较高,证实了该方法的可靠性。北布扎奇油田聚合物驱试验井组计算实例表明,考虑提液影响的产量递减分析法相比于产量递减分析法,误差减小了24%,可以客观评价聚合物驱增油效果。

Determination of incremental oil is the key to polymer flooding performance evaluation and economic analysis.For common-ly used polymer flooding methods to evaluate incremental oil,the production decline analysis method is the most widely used,however,when production rate changes greatly during the process of polymer flooding,the calculation of incremental oil using this method willresult in a great error.This method is improved in this paper for eliminating the impact of extracts.Also,the analysis is conducted com-pared with the numerical simulation method,which has confirmed the reliability of the method.Calculation examples for north Buzachipolymer flooding test wells group show that,the improved production decline analysis method can be comprehensive and objective forevaluation of the effect of increasing oil of polymer flooding,which will provide scientific guidance for decision-making on polymer flooding.