基于流场强度的注采调控优化方法

Optimization Method of Injection-production Control Based on Flow Field Intensity

针对强非均质砂岩油藏高含水期油水井间逐步形成优势流场,注入水低效无效循环,驱替不均衡问题,提出了基于流场强度差异最小化的注采调控方法。首先筛选确定过水倍数增量、流动水饱和度2个关键评价指标,建立了流场强度量化表征方法;其次构建了以油藏流场强度变异系数最小作为目标函数的注采调控数学模型,采用人工蜂群算法(ABC)对模型进行优化求解,得到油水井最优配产配注量。油藏实际应用结果表明,该优化方法可有效改善油藏水驱均衡驱替程度及开发效果,可进一步提高水驱采收率。

In order to solve the problems of the dominant flow field between oil and water wells in high water cut stage of strong heterogeneous sandstone reservoir,low-efficiency or ineffective circulation of injected water and unbalanced displacement,an injection-production control method based on the minimization of the difference of flow field intensity is proposed.Taking the increment of water passing multiple and the flowing water saturation as two key evaluation indexes,the quantitative characterization method of flow field intensity is established.Then a mathematical model of injection-production control is established,which takes the minimization of the variation coefficient of reservoir flow field intensity as the objective function,the model is solved by the artificial bee colony algorithm(ABC),and the optimal production-injection allocation of oil and water wells is obtained.The practical application results show that the optimization method can effectively improve the balanced displacement degree and development effect of water flooding reservoirs,and further improve the water flooding recovery factor.