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枣园油田经过20多年注水开发和挖潜调整后,水驱效果逐渐变差。目前进入高含水开发阶段,存在开发层系混乱、层间层内注水矛盾突出、套变报废井多、地层窜通严重等问题。针对小井距注水,采用周期性温和注水的方式,并摸索合理的注水周期和注水量,来抑制地层水淹,缓解开发矛盾,达到提高采收率,改善高含水开发效果的目的。
After more than 20 years of water injection development and tapping potential adjustment, the waterflooding effect of Zaoyuan Oilfield gradually becomes worse. At present, the development of high-water-content development stage is characterized by confusion in the development layer system, prominent water injection in the inter-layer layers, large number of wells that are set up for re-entry, and severe formation stratification. Aiming at the injection of water from small wells, a cyclical gentle injection method is adopted, and a reasonable water injection cycle and water injection amount are explored to suppress formation flooding and ease development contradictions so as to increase oil recovery and improve development effect of high water cut.