摘要
塔河油田碳酸盐岩油藏2011年底标定采收率为15.6%,低于国内外的平均水平20%,具有很大的提升空间潜力。通过注水替油和单元注水,从一定程度上改善了开发效果,但随着注水替油效果变差,剩余油主要分布在缝洞体的高部位,有必要探索通过注气动用高部位的剩余油。通过实验并结合数值模拟技术,开展了典型的单井缝洞单元注氮气吞吐提高采收率机理研究,TK404井现场注氮气取得了良好的增油效果,证实了单井定容体残丘高部位富集有大量剩余油,通过注氮气能有效提高这部分剩余油的采出程度,为塔河油田缝洞型油藏今后实施注气提高采收率现场试验提供了积极的参考和指导。
The latest calibration recovery ratio in Tahe carbonate reservoir is 15.6 percent, which is below the average recovery at home and abroad (20 percent), so it has great potential to increase. The oil in caves was displaced by injecting water to reach a better development effect. Meanwhile,the effect of EOR was reduced gradually during the middle period of water injection. The remaining oil stored in the top of the cave. It is necessary to explore and practise the means of gas injection to displace the remaining oil. By laboratory experiment and numerical simulation technology, the mechanics of gas injection to displace the remaining oil in fracture-cave type reservoirs was discussed. Through field application, the good increase oil production effect was obtained in well TK404 and the recovery ratio of remaining oil was improved.
出处
《钻采工艺》
CAS
北大核心
2013年第2期55-57,8-9,共3页
Drilling & Production Technology
基金
国家科技重大专项"塔里木盆地大型碳酸盐岩油气田开发示范工程"(编号:2011ZX05049)
关键词
缝洞型油藏
重力分异
注气替油
fracture-cave type reservoirs, gravitational differentiation, injection gas, displace remaining oil
