缝洞型碳酸盐岩油藏注氮气可行性研究

塔河油田注水替油吞吐进入高轮次以后，油水界面不断升高，注水替油效果不断变差，剩余油主要分布在构造起伏的高部位，此类剩余油俗称“阁楼油”。国外利用氮气及天然气驱工艺开采“阁楼油”的技术已成熟。为了进一步提高塔河油田的开发效果，开展了对注N2开采裂缝一溶洞型碳酸盐岩油藏可行性的研究。针对塔河该类油藏的地质及生产特点，分析了注氮气提高采收率的机理及有利地质条件；在井筒多相流及数值模拟的基础上，论证了塔河碳酸盐岩油藏注氮气提高采收率的可行性，对注气量、闷井时间、注气采油方式、注气速度等技术政策界限进行了优化研究。研究结果表明，在塔河碳酸盐岩油藏一定工艺技术保障下，注氮气提高采收率是可行的，预计采收率提高10％左右。

The feasibility study for fractured and cavernous carbonate reservoir by injecting nitrogen

The displacement of oil by water in Tahe oil field is at a high number of rounds.The WOC is rising and the oil displacement of effect by injecting water is deteriorating.The remaining oil called attic oilare mainly distributed in the structural relief of high position.The technology for exploitation of attic oil are available by injecting nitrogen or natural gas in foreign countries.The author operates the feasibility study for exploitation of fractured and cavernous carbonate reservoir by injecting nitroge...