基于液油联合预测的聚合物驱增油效果评价方法

Evaluation method of oil increasing effect of polymer flooding based on combined prediction of liquid and oil production

聚合物驱增油效果评价是实施油田聚合物驱决策的重要工作。常用的聚合物驱增油效果评价方法所需参数较多、效率低、成本高。本文基于实际生产数据计算得到无因次采液指数曲线,联立广适水驱特征曲线,并综合考虑海上平台液处理能力限制,建立了液油联合产量预测方法,该方法能够快速定量化评价出海上油田聚合物驱增油效果及预测未来生产动态,做出符合工程设施现状的评价决策。以渤海X油田为例进行了方法应用,结果表明,预测得到的聚合物驱前后增油量、含水率与采用数值模拟方法得到的计算结果基本一致。本文方法操作简单、预测精度高,能够作为油田聚合物驱增油效果快速评价及决策的有效方法。

Evaluation of oil increasing effect by polymer flooding is an important work to make decision of polymer flooding in oil field.The commonly used methods for evaluating the oil increasing effect by polymer flooding require more parameters,yet are less efficient and high-cost.In this paper,based on the actual production data,the dimensionless liquid production index curve is calculated,the universal water flooding characteristic curve is juggled,and the liquid-oil combined production prediction method is establish in consideration of the liquid treatment capacity limitation of the offshore platform,which can quickly and quantitatively evaluate the oil increasing effect by polymer flooding in offshore oilfield and predict the future production dynamics,and make evaluation decisions in line with the current situation of engineering facilities.Taking Bohai X oilfield as an example,the application results show that the predicted oil increment and water cut before and after polymer flooding are basically consistent with the calculation results obtained by numerical simulation method.The method proposed in this paper is simple to operate and of high prediction accuracy,which can be used as an effective method for rapid evaluation and decision making of oil increasing effect by polymer flooding in oil field.