国内外大量的理论研究和矿场试验结果表明,周期注水是改善水驱开发效果的经济有效的调整方式。周期注水的最大优点是利用现有的井网和层系,通过压力场的调整,使常规水驱滞留的原油动起来,提高水驱采收率,操作简便,经济有效,易于大规模推广。大庆油田近几年来在采油三厂、四厂、 A large number of theoretical studies and field tests at home and abroad show that periodic waterflooding is a cost-effective way to improve the effect of waterflooding. The biggest advantage of periodic water injection is the use of existing well patterns and layers through the adjustment of the pressure field, so that the conventional water retention of crude oil to move up to improve waterflood recovery, easy to operate, cost-effective and easy to promote large-scale. Daqing Oilfield in recent years in the oil production three plants, four plants,