深层稠油油藏注天然气吞吐泡沫油流特征数值模拟研究

深层稠油油藏的有效开采是世界性的难题，天然气吞吐开采是有效的方法之一。其中天然气吞吐回采阶段泡沫油流的驱油特征研究尚不深入。本文采用考虑泡沫油的数值模拟方法，以吐哈鲁克沁油田深层稠油油藏天然气吞吐为实例，从模拟网格尺寸、油藏非均质程度、注入气溶解速度等角度，对吞吐回采阶段的“泡沫油流”的渗流特征展开描述。研究结果表明，数值模拟研究要建立适宜的网格模型才能反映真实的泡沫油流动态；注气气体扩散水平较高时，非均质的影响效果显现，气体优先从储层突破影响原油的生产；当注入气体溶解速率低时，微气泡少，影响稠油的流动性，累积采油量减少。

The Numerical Simulation Study of Foamy Oil Flow Characteristics by Natural Gas Huff and Puff for Deep Heavy Oil Reservoirs

It is a world problem of effective producing for deep heavy oil reservoirs. The process of natural gas huff and puff is one of the effective methods. However the foamy displacement characteristics study is not advanced. The paper presents the foamy oil numerical simulation study based on the example of natural gas huff and puff in Tuha Lukeqin deep heavy oilfield. The characteristics is illustrated from the factors of simulation grid size, reservoir heterogeneity degree, injected gas dissolution rate. The results show that while the real foamy flow feature is simulated by the appropriate grid model, the higher injection gas diffusion level is and the higher heterogeneous is, the greater the influence on yields is. When the lower injected gas dissolution rate is, the less small bubble is to have effect on the oil mobility, the cumulative oil production reduces.