Quantitative Analysis of Fracture Roughness and Multi-Field Effects for CO 2 -ECBM Projects

Lingshuo Zhang and Yafei Shan ()
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Lingshuo Zhang: College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China
Yafei Shan: College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China

Energies, 2024, vol. 17, issue 12, 1-19

Abstract: Carbon Dioxide-Enhanced Coalbed Methane (CO 2 -ECBM), a progressive technique for extracting coalbed methane, substantially boosts gas recovery and simultaneously reduces greenhouse gas emissions. In this process, the dynamics of coalbed fractures, crucial for CO 2 and methane migration, significantly affect carbon storage and methane retrieval. However, the extent to which fracture roughness, under the coupled thermal-hydro-mechanic effects, impacts engineering efficiency remains ambiguous. Addressing this, our study introduces a pioneering, cross-disciplinary mathematical model. This model innovatively quantifies fracture roughness, incorporating it with gas flow dynamics under multifaceted field conditions in coalbeds. This comprehensive approach examines the synergistic impact of CO 2 and methane adsorption/desorption, their pressure changes, adsorption-induced coalbed stress, ambient stress, temperature variations, deformation, and fracture roughness. Finite element analysis of the model demonstrates its alignment with real-world data, precisely depicting fracture roughness in coalbed networks. The application of finite element analysis to the proposed mathematical model reveals that (1) fracture roughness ξ markedly influences residual coalbed methane and injected CO 2 pressures; (2) coalbed permeability and porosity are inversely proportional to ξ ; and (3) adsorption/desorption reactions are highly sensitive to ξ . This research offers novel insights into fracture behavior quantification in coalbed methane extraction engineering.

Keywords: CO 2 -ECBM; fracture roughness; multi-field effects; numerical simulation; permeability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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