Abstract The override of injected gas in condensate gas reservoirs leads to poor displacement efficiency, and rare research are found to describe this overburden phenomenon occurred in condensate gas reservoirs. This paper presents a mathematical model to describe the override of injected gas, and numerical investigations on a two-dimensional (2D) cross section is used to generate the results. This study examined the effects of different injected gases on the degree of gas override. In addition, this research analyzed the effects of key factors related to reservoir properties and exploitation methods on the gas override. The results demonstrate that the gravity plays a vital role in the formation of overburden phenomenon. The quadrature analysis carried out on a case study exhibits that density difference and perforation position are other two dominant factors in the development of gas overburden.

中文翻译：

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凝析气藏注气超载理论研究

摘要 凝析气藏注入气超载导致驱替效率低下，目前很少有研究描述凝析气藏发生的这种上覆现象。本文提出了一个数学模型来描述注入气体的超控，并使用二维 (2D) 横截面的数值研究来生成结果。该研究检查了不同注入气体对气体超驰程度的影响。此外，本研究还分析了与储层性质和开采方法有关的关键因素对天然气超载的影响。结果表明，重力在覆盖层现象的形成中起着至关重要的作用。