A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery

Bargain, François; Cerfontaine, Benjamin; Collin, Frèdèric

doi:10.1016/j.jngse.2017.07.029

Cited by 53 publications

(28 citation statements)

References 67 publications

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“…This transient aspect is not taken into account in the analytical model. It would require to use some shape factors (Barenblatt et al, 1960;Warren et al, 1963;Bertrand et al, 2017) in the analytical solution. For the hyperbolic evolution of the fracture stiffness in Figure 15, the initial fracture aperture and stiffness were taken the same as the constant case.…”

Section: Hyperbolic Fracture Stiffnessmentioning

confidence: 99%

“…Many models taking into account the coal permeability evolution with the gas pressure have been developed over the past few decades (Somerton et al, 1975;Schwerer et al, 1984;Seidle et al, 1992;Gilman and Beckie, 2000;Connell, 2007, 2012;Shi et al, 2014;Peng et al, 2017;Bertrand et al, 2017). However, these models are either analytical formulations or macroscopic models.…”

Section: Introductionmentioning

confidence: 99%

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Cleat-scale modelling of the coal permeability evolution due to sorption-induced strain

Bargain

Buzzi

Collin

2019

International Journal of Coal Geology

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Coal permeability is known to be affected by the sorption-induced strain. Indeed, coal swells with gas sorption and shrinks with desorption, which is likely to modify the cleat aperture and thus the permeability. Coal permeability evolution is crucially important for either Coalbed Methane production (CBM) or Carbon dioxide Capture and Storage (CCS). A model is developed at the scale of the fractures to take into account the hydromechanical couplings observed experimentally. It is implemented in the finite element code Lagamine. This numerical model is developed at the scale of the fractures and the matrix blocks. Fractures are modelled with interface elements specially adapted to manage sorption/desorption by taking into account the Langmuir's isotherm (Langmuir, 1918). In the matrix blocks, the sorption strain is assumed proportional to the adsorbed gas content. Depending on the boundary conditions, sorption strain affects the stress state and thus the fracture aperture. Contrary to macroscale models (Bertrand et al., 2017), this model does not require the use of shape factors since the geometry can be explicitly represented. The implementation of the model is validated by comparison with the analytical solution on a simple geometry. The model is finally used to simulate gas injection on a representative elementary volume (REV) made up few matrix blocks. This modelling highlights the interests of a numerical approach to compute the permeability evolution compared to a porosity-based model.

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Section: Hyperbolic Fracture Stiffnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cleat-scale modelling of the coal permeability evolution due to sorption-induced strain

Bargain

Buzzi

Collin

2019

International Journal of Coal Geology

Self Cite

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“…Gao et al [28] explored the gas extraction effect with slotted boreholes using a THM coupled model. A hydro-mechanical model for the modeling of coalbed methane extraction is introduced by Bertrand et al [29]. They focused on the impact of critical parameters related to coal seams on the methane production.…”

Section: A Conceptual Modelmentioning

confidence: 99%

“…Wang et al [27] used a coupled model including equilibrium desorption model and dynamic desorption model to analyze how the non-Darcy flow influences coal seam methane extraction. Gao et al [28] explored the gas extraction effect with slotted boreholes using a THM coupled model .A hydro-mechanical model for the modeling of coalbed methane extraction is introduced by Bertrand et al [29]. They focused on the impact of critical parameters related to coal seams on the methane production.…”

Section: Introductionmentioning

confidence: 99%

Fully Coupled Multi-Scale Model for Gas Extraction from Coal Seam Stimulated by Directional Hydraulic Fracturing

Zhang

Sun

et al. 2019

Applied Sciences

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Although numerous studies have tried to explain the mechanism of directional hydraulic fracturing in a coal seam, few of them have been conducted on gas migration stimulated by directional hydraulic fracturing during coal mine methane extraction. In this study, a fully coupled multi-scale model to stimulate gas extraction from a coal seam stimulated by directional hydraulic fracturing was developed and calculated by a finite element approach. The model considers gas flow and heat transfer within the hydraulic fractures, the coal matrix, and cleat system, and it accounts for coal deformation. The model was verified using gas amount data from the NO.8 coal seam at Fengchun mine, Chongqing, Southwest China. Model simulation results show that slots and hydraulic fracture can expand the area of gas pressure drop and decrease the time needed to complete the extraction. The evolution of hydraulic fracture apertures and permeability in coal seams is greatly influenced by the effective stress and coal matrix deformation. A series of sensitivity analyses were performed to investigate the impacts of key factors on gas extraction time of completion. The study shows that hydraulic fracture aperture and the cleat permeability of coal seams play crucial roles in gas extraction from a coal seam stimulated by directional hydraulic fracturing. In addition, the reasonable arrangement of directional boreholes could improve the gas extraction efficiency. A large coal seam dip angle and high temperature help to enhance coal mine methane extraction from the coal seam.

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“…Modelling such coupled phenomena requires more complex models than those normally used for conventional reservoirs. For instance, a reservoir-scale model accounting for sorption-and stressinduced coal permeability alteration is presented in [5]. This paper presents a laboratory-scale multiphysics model.…”

Section: Introductionmentioning

confidence: 99%

Laboratory-Scale Study On The Swelling Behaviour Of Coal Due To CO2 Injection

2018

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A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery

Cited by 53 publications

References 67 publications

Cleat-scale modelling of the coal permeability evolution due to sorption-induced strain

Cleat-scale modelling of the coal permeability evolution due to sorption-induced strain

Fully Coupled Multi-Scale Model for Gas Extraction from Coal Seam Stimulated by Directional Hydraulic Fracturing

Laboratory-Scale Study On The Swelling Behaviour Of Coal Due To CO2 Injection

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