大庆油田三类油层聚合物驱数值模拟研究

Numerical simulation of polymer flooding in Class Ⅲ reservoir of Daqing Oilfield

张彦辉 曾雪梅 王颖标 曲薇薇

东北石油大学提高油气采收率教育部重点实验室，黑龙江 大庆 163318 大庆油田有限责任公司第三采油厂，黑龙江 大庆 163000 大庆钻探工程公司钻井四公司，吉林 松原 138000

MOE Key Laboratory of Enhanced Oil and Gas Recovery, Northeast Petroleum University, Daqing 163318, China NO.3 Oil Production Plant, Daqing Oilfield Company Limited, PetroChina, 163000, China Fourth Branch of Daqing Drilling Company, Songyuan 138000, China

大庆油田萨北开发区三类油层动用状况较差，采出程度低，是进一步增储上产的潜力所在。通过开展三类油层聚合物驱分阶段开采对象潜力及界限研究，在分析大庆油田三类油层地质特征的基础上，以及对大庆油田正在开展的三类油层注聚合物试验区开发状况分析，应用数值模拟方法，分析萨北开发区北二东研究区三类油层剩余油分布规律和注聚合物最佳组合开发模式等。结果表明：三类油层注聚合物开发，采用一期射开有效厚度小于0.5 m油层聚合物驱，二期补开有效厚度大于0.5 m油层聚合物驱，提高采收率幅度及含水率下降幅度最大，能有效地挖潜油藏剩余油，提高采收率。

The producing performance of Class Ⅲreservoir is poor and the degree of reserves recovery is low in Sabei development area. There still is a lot of remaining oil in the reservoir, and it is a potential aim of further increasing reserves and production. Through the research of the potential and limit for staged exploitation of polymer flooding in Class Ⅲ reservoir, on the basis of the analysis of geological features of Class Ⅲ reservoir in Daqing Oilfield, as well as the analysis of development status of pilot area of polymer injection of the reservoir, numerical simulation is used for the analysis of remaining oil distribution rule in Class Ⅲ reservoir of northeast No.2 pilot area in northern Saertu study area and the analysis of the best combination development model of polymer flooding in Class Ⅲ reservoir. The results show that for the polymer flooding development in Class Ⅲ reservoir, it is best to conduct the polymer flooding in the reservoir where the perforated effective thickness is less than 0.5 m at the first stage, with the polymer flooding in the reservoir where the effective thickness is greater than 0.5 m at the second stage. It can effectively tap the potential of remaining oil and increase the recovery ratio.