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泡沫油是一种含有大量分散性小气泡的稠油,衰竭开发泡沫油具有产量高、气油比低、地层压力下降缓慢和采收率高等特点。提出了利用数值模拟技术模拟泡沫油的关键方法,并建立了泡沫油数值模型。通过与常规溶解气驱数值模拟结果的比较以及与室内实验结果的拟合,从定性和定量2个方面证明了所建立模型的可靠性,并利用该模型进一步研究了泡沫油的驱油机理。泡沫油油藏开发过程中产生的分散气,一方面增加了原油的流动能力,当平均地层压力降低到泡点压力以下后仍然能够以初始产量生产1a以上;另一方面增加了体系的膨胀能,减缓了地层压力下降速度,地层压力从6.0MPa降低到5.1MPa的时间接近于从10.0MPa降低到6.0MPa的时间。
Foamy oil is a kind of heavy oil containing a large number of scattered small bubbles. The developed foamy oil has the characteristics of high output, low gas-oil ratio, slow down of formation pressure and high oil recovery. The key method of simulating foaming oil by numerical simulation is put forward and the numerical model of foam oil is established. The reliability of the established model is proved from two aspects of qualitative and quantitative proof by comparing with the results of conventional numerical simulation of dissolved gas flooding and the result of laboratory experiment. The oil displacement mechanism of foam oil is further studied by using the model. Dispersed gas generated during the development of foamed oil reservoirs increases the flowability of crude oil on the one hand and can still produce above 1a for the initial production when the average formation pressure drops below the bubble point pressure. On the other hand, the expansion energy , Which slows down the rate of formation pressure decline. The time for the formation pressure to decrease from 6.0MPa to 5.1MPa is close to the time from 10.0MPa to 6.0MPa.