CH4 transport in micro–nano porous media associated with supercritical CO2 flooding

Injecting supercritical CO2 into tight gas reservoirs to displace CH4 is an extremely promising technology of unconventional gas exploitation. However, Darcy's law cannot describe the gas flow due to ultra-low permeability and micro–nano porosity of tight rock. The present work is an analytical...

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Bibliographic Details
Published in:Physics of fluids (1994) 2022-07, Vol.34 (7)
Main Authors: Deng, Jia, Li, Jiujiang, Zhang, Lan, Song, Fuquan, Wang, Dong, Wang, Hongjian
Format: Article
Language:English
Subjects:
Carbon dioxide
Darcys law
Flooding
Fluid dynamics
Fluid flow
Gas flow
Gas recovery
Mass flow
Mathematical models
Methane
Permeability
Physics
Porous media
Pressure drop
Seepage
Unsteady state
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Summary:Injecting supercritical CO2 into tight gas reservoirs to displace CH4 is an extremely promising technology of unconventional gas exploitation. However, Darcy's law cannot describe the gas flow due to ultra-low permeability and micro–nano porosity of tight rock. The present work is an analytical approach to investigating the nonlinear seepage characteristics of CH4 displacement by supercritical CO2. Moreover, considering the steady and unsteady state conditions, mathematical models for planar linear flooding, planar radial flooding, and single well and one-well injection/one-well production types are presented, computed, and verified. Their equipotential and streamline charts are first determined by implementing the model. Additionally, by investigating variables such as formation pressure, producing pressure drop, permeability, temperature, well spacing, and mass flow, their contributions to gas production rate are determined. Finally, an approach for improving the gas recovery efficiency is obtained based on the obtained results.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0100762