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孤岛油田在经历水驱、聚合物驱和聚驱后水驱等多轮开采后,地下剩余油高度分散,采出液含水高,开采难度加大。如何提高聚驱后油藏的采收率对于提高油田的整体开发效益尤为重要。基于“边调边驱”原则,室内开展了空气泡沫驱提高采收率方法研究。模拟了正韵律高含水油藏地质模型(由高、中、低渗并联岩心管组成)。通过对不同发泡剂质量分数、不同气液比下泡沫体系阻力因子的测定,得到最佳条件为发泡剂质量分数0.5%`和最佳气液体积比1∶1。经室内高、低采出程度下空气泡沫体系的封堵性和调驱性能实验,结果表明,优化空气泡沫的段塞组合,可大大提高不同采出程度下油藏的采收率。第一轮水驱后岩心为15.37%的低采出程度条件下,空气泡沫调驱采收率可提高22.02%;岩心采出程度高达45.53%的条件下,第二轮带有纯空气段塞的泡沫驱采收率可提高9.35%。
Gudao Oilfield has undergone many rounds of mining such as water flooding, polymer flooding and water flooding after polymer flooding. The residual oil in the underground is highly dispersed and the water content in the produced fluid is high, making it more difficult to mine. How to improve the oil recovery after the reservoir for improving the overall development of the oil field is particularly important. Based on the principle of “adjusting the edge while driving”, the research on the method of enhanced recovery of air foam flooding was carried out indoors. The geological model of positive rhythm and high water cut reservoir (composed of high, medium and low permeability parallel core tubes) is simulated. Through the determination of the resistance factor of foaming system with different foaming agent mass fraction and different gas-liquid ratio, the optimal conditions were as follows: the mass fraction of foaming agent 0.5% and the optimal liquid-liquid ratio 1: 1. The results of experiments on the plugging performance and the driving performance of the air foam system under the condition of indoor high and low extraction rate show that the optimization of the combination of air foam slug can greatly enhance the recovery rate of the reservoir under different production recovery. The first round of water flooding after 15.37% of the core of the low-recovery conditions, the air bubble control flooding recovery can be increased 22.02%; core recovery of up to 45.53% of the conditions, the second round with pure air slug Of the foam flooding recovery can be increased 9.35%.