泡沫油油藏数值模拟研究

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。

Numerical simulation study on horizontal well in foamy oil reservoir

Foamy oil is a kind of heavy oil containing dispersed little gas bubbles,showing different characteristics from conventional oil flow during natural depletion,and its oil production is high,gas oil ratio is low,and formation pressure declines slowly and recovery is high.The technique for simulating foamy oil using numerical simulation is proposed,and the model of foamy oil is established based on the laboratory study.The result comparison between the foamy oil and dissolved gas drive reservoir proves the reliability of the model qualitatively and quantitatively.An in-depth study of drive mechanism of foamy oil is carried out.The dispersed gas generated from the production of the foamy oil reservoir increases the flow capacity of crude oil,and also increases the expandability of the system,and ameliorates the draw down of the reservoir pressure,therefore,enhancing the elastic recovery.