大庆油田二类油层注聚后期合理转后续水驱注入时机研究

摘要

大庆油田二类油层已经进入聚合物后期阶段,为了对提高区块采收率,确保油田可持续发展,通过设计后续水驱不同含水阶段开展聚合物溶液驱油的注入参数,与数值模拟对二类油层注聚后期转后续水驱最佳时机研究的成果相互验证,结果表明了当含水为94.7％时,为转后续水驱最佳时机的含水界限.该结论对现场为二类油层注聚后期转后续水驱方案编制具有指导意义.%Daqing oilfield has entered into the late stage of polymer flooding,in order to improve the recovery rate of blocks and ensure the sustainable development of oil fields,the injection parameters of polymer solution flooding were designed in different stages of water flooding,and the results were compared with numerical simulation in the study of the best timing for the subsequent water drive.The results show that the water limitation is the best time for the subsequent water drive when the water content is 94.7％.The conclusion is instructive for the preparation of subsequent water flooding program after polymer flooding in class Ⅱ reservoirs.