聚合物驱矿场应用新技术界限研究与应用

Study and application of new technological limit for polymer flooding in field application

为了明确聚合物驱技术的适用性,通过对比中外10个聚合物驱技术界限及关键参数的取值,分析了影响聚合物驱效果的关键因素,主要包括油藏温度、地层水矿化度及二价阳离子质量浓度、原油粘度、油藏渗透率及非均质性等。以中国聚合物驱矿场应用油藏参数分布区域为中心,以聚合物驱技术界限中的边界值为界限,按照不同比例矿场实例所在的参数区间建立了5级技术界限参数序列。利用建立的聚合物驱技术界限对中外6个油藏进行聚合物驱方法筛选,青海E油藏筛选综合评分仅为2.125分,低于方法适用评分(3分),建议在该区不采用聚合物驱技术;其余5个油藏评分都高于3分,可采用聚合物驱技术。大庆L油藏和SZ36-1油藏的聚合物驱评分结果与矿场试验效果一致,采收率分别提高了11.88%和3.62%。因此,新建立的聚合物驱技术界限可用于评价和对比不同区块的聚合物驱适用性。

The key parameters and their values in the worldwide EOR technological limit for polymer flooding are compared in the pa-per.The main influence factors for polymer flooding are analyzed,and the distribution pattern of reservoir parameters in oilfields thathave successfully applied polymer flooding is found.By considering the technical advancement and the application of polymer flooding,the new technological limits and parameter gradation series are established by using area percentage function of parameter distribution.The new technological limits for polymer flooding are used to evaluate the applicability of polymer flooding in 4 different reservoirs.Theresult shows that the new technological limits and parameter gradation series are applicable for the field research.