Numerical simulation of gas injection enhanced coalbed methane recovery based on bi-dispersing diffusion model with Maxwell-Stefan equation

被引：0
|
作者：
Sun X. [1 ,2 ]
Zhang Y. [1 ]
Li K. [3 ]
Li Z. [1 ]
Shang F. [4 ]
Sun R. [1 ]
机构：
[1] School of Petroleum Engineering in China University of Petroleum, Qingdao
[2] School of Geosciences in China University of Petroleum, Qingdao
[3] Institute of Experiment and Analysis, PetroChina Xinjiang Oilfield Company, Karamay
[4] Development Research Department, CNOOC Research Institute, Beijing
来源：
| 1600年 / University of Petroleum, China卷 / 40期
关键词：
Bi-dispersing diffusion model; Coalbed methane; Gas injection; Maxwell-Stefan equation; Multi-component adsorption equilibrium;
D O I：
10.3969/j.issn.1673-5005.2016.03.015
中图分类号：
学科分类号：
摘要：
In most commercial coalbed methane simulation software, an extended Langmuir model, quasi-steady single pore diffusion and Fick's law are currently used to describe the adsorption of mixed gases on coal rocks and gas diffusion process. Although these methods are simple and easy for application, there are also some limitations. In this paper, the effectiveness of the extended Langmuir, IAS and 2D PR-EOS models for the prediction of the gas adsorption process on coal was analyzed with experimental data in order to establish a better model for the simulation. Then, the Maxwell-Stefan equation was used to develop a bi-dispersing diffusion model, in which the 2D PR-EOS model was used to predict multi-component gas adsorption. Finally, the bi-dispersing diffusion model was coupled with a gas/water two-phase multi-component simulation model, and the IMPES method was used to solve the equations. The simulation results of gas injection for enhanced coalbed methane recovery using CO2 and N2 show that the 2D PR-EOS model is better than the extended Langmuir and IAS models, which can reflect the relative adsorption of multi-component gases. The adsorption and desorption rates of gases are faster in the early stage of the gas injection, then gradually become slow, and the adsorption rate of CO2 is significantly higher than that of N2. This numerical simulation method can effectively simulate the gas injection process for enhanced methane recovery, and accurately predict the distribution of different gas components in the coal matrix. © 2016, Periodical Office of China University of Petroleum. All right reserved.
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页码：113 / 120
页数：7
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