# Numerical Simulation of Dry Gas Migration in Condensate Gas Reservoir

• Y. Sun University of Science and Technology Beijing
• W.Y. Zhu University of Science and Technology Beijing
• B.Z. Li PetroChina Research Institute of Petroleum Exploration & Development
• J. Xia PetroChina Research Institute of Petroleum Exploration & Development
• Y.W. Jiao PetroChina Research Institute of Petroleum Exploration & Development
• K. Huang University of Science and Technology Beijing

### Abstract

Dry gas overlies on condensate gases and flows due to the difference in density. This phenomenon affects cyclic injectionexploitation and increases production costs. A mathematical model of dry gas migration was developed in this study toinvestigate the migration characteristics and the overlying law for dry gas in the condensate gas reservoir. On the basis of thetheory of convection diffusion, the governing equations were constructed, using dry and condensate gases as two pseudocomponents.The distribution and transition belt of dry gas, as well as the effects of condensate oil and the perforation methodon overlying of dry gas were discussed based on the dry gas migration model. The results demonstrate that the width of thetransition belt of dry and condensate gases increases gradually over time. The mole fraction of gas in the transition belt isdense in the middle, but sparse at the two ends. The overlying of dry gas is easy, taking condensate oil into consideration. Thevalue of F increases by 0.32, but the width of the transition belt becomes narrow. The transition belt under the top perforationof the reservoir is wider than that under symmetric perforation, and the overlying degree of dry gas increases. This studyprovides a theoretical foundation for in situ adjustment and optimization of cyclic gas injection utilization.

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Published
2018-07-30
How to Cite
SUN, Y. et al. Numerical Simulation of Dry Gas Migration in Condensate Gas Reservoir. Journal of Power Technologies, [S.l.], v. 98, n. 2, p. 212–219, july 2018. ISSN 2083-4195. Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1288>. Date accessed: 23 july 2024.
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