Modelling of geomechanical response for coal and ground induced by CO2-ECBM recovery

Li, Xudong; Sang, Shuxun; Zhou, Xiaozhi; Wang, Ziliang; Niu, Qinghe; Mondal, Debashish

doi:10.1016/j.jgsce.2023.204953

Cited by 7 publications

(2 citation statements)

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“…Therefore, the permeability of the coal seam and the pressure of coalbed methane significantly evolve with changes in fracture roughness. In contrast, other models of coalbed methane extraction published so far [2,3,7,15] cannot quantitatively characterize this feature. Hence, the analytical advantages of this study are fully highlighted.…”

Section: The Verification Of Model Correctness and Advantagesmentioning

confidence: 84%

“…These studies predominantly involve experiments, including the mechanism of CO 2 injection, the displacement effects under various conditions, and the detailed analysis of the reaction between CO 2 and coalbeds. (2) Mechanism analyses of multi-field coupling during the CO 2 -ECBM process [14][15][16] primarily employ numerical simulation and constitutive model development to explore the displacement efficiency of CO 2 under different pressures, temperatures, and in situ stress, as well as its impact on the microstructure of coalbeds.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of Fracture Roughness and Multi-Field Effects for CO2-ECBM Projects

Zhang,

Shan

2024

Energies

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Carbon Dioxide-Enhanced Coalbed Methane (CO2-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 CO2 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 CO2 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 CO2 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.

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Section: The Verification Of Model Correctness and Advantagesmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%