“2+3”采油技术及调驱效率的进一步研究

“2+3” PROFILE CONTROL AND OIL DISPLACEMENT TECHNOLOGY USED FOR ENHANCE OIL RECOVERY

受油藏非均质性和不利的流度比影响,注水开发过程中常出现油井见水早或油井见水后含水上升快、含水率高、注入水波及系数低等问题,严重影响了水驱油藏的开发效果。"2+3"提高采收率技术综合了调剖和化学驱油的优点,从机理上完善了二次采油的不足。文章利用微观可视模型和岩心流动实验对"2+3"调驱技术进行了机理实验。在相同实验条件下,把"2+3"调驱技术的实验结果分别同调剖实验结果和化学驱油实验结果进行对比,结果表明,"2+3"采油技术的提高原油采收率幅度比单一的调剖和驱油技术都高,具有可推广性。

In the process of water flooding, for the effects of reservoir heterogeneity and unfavored mobility ratio, the water out of oil well was early, water ratio rose quickly after well breakthrough, and the sweep efficiency of injecting water was low, these problems influenced the development effects of water-drive reservoir. '2+3' oil recovery technology synthesized the advantages of profile control and chemical flooding technology, and perfected the shortages of secondary oil recovery in mechanism. The mechanism of '2+3' oil recovery technology were studied by rock flow experiment and using microscopic viewable model. Under the same experiment condition, the laboratorial results of '2+3' oil recovery technology were compared with the laboratorial results of the profile control and the chemical flooding respectively. The experimental results indicated that the EOR effect of '2+3' oil recovery technology was very good.