The structure of fractures and pores has a dominant impact on the heat transfer-seepage-deformation process coal seam. Previous models have primarily used cubic permeability model to characterize seam properties. In this study, we developed new multi-field coupling model, which includes fracture pore structure, temperature, effective stress gas seepage. Two major extraction scenarios were simulated: unconstrained plane strain state uniaxial state. addition, two microstructural parameters...

In the process of gas extraction, fracture-pore structure significantly influences macroscopic permeability coal seam. However, under multi-field coupling, mechanism seam evolution remains to be clarified. this paper, considering effect adsorption expansion, fractal theory for porous media coupled with model is considered, and a coupling mechanical constructed by influence structure. Furthermore, dimension physical parameters studied. It found that inversely proportional mining time in situ...

As one of the most significant clean energy sources, migration characteristics and extraction processes coalbed methane (CBM) have been extensively studied. The structural distribution evolutionary reservoir fractures, as main conduit for gas migration, significantly affect permeability production. However, few models able to quantitatively accurately explore micro–macro interactions under coupled thermal-fluid–solid effects. This work develops a new highly model based on widely adopted...

Changes in the internal microstructure of shale reservoirs have a significant effect on gas production. In this research, based double power law model and triple medium theory, multi-scale fracture distribution is constructed. The accuracy verified by comparing with actual test results. Then, used to analyze relationship between stress, permeability, three kinds pore media as well influence parameters external force reservoir macroscopic findings indicate that (1) affected forces; (2)...

Coal bed methane, a crucial clean energy source, has attracted extensive research attention. Characterized by intricate and rough fracture systems, coal seam is vital for gas migration, which will be influenced the in situ stress, temperature, adsorption–desorption effect, solid deformation, pressure. This paper introduces an innovative, interdisciplinary fractal model that addresses limitations of current computational models accurately representing complex fractures under coupled...

This study explores the efficiency of using carbon dioxide (CO2) to extract shale gas, highlighting its potential enhance extraction while mitigating environmental CO2 pollution. Given intricate microstructure shale, injection inevitably induces deformation within reservoir's internal microstructure, thereby impacting gas displacement efficiency. The organic matter (kerogen) network and fracture in serving as primary spaces for adsorption migration, exhibit complex microstructural...

The Carbon Dioxide Enhanced Coalbed Methane (CO2-ECBM) technique significantly enhances clean energy extraction and mitigates climate change. Central to this process is the dynamic evolution of rough fracture networks within coal seams, influencing migration CO2 natural gas. However, existing research lacks a comprehensive, quantitative approach examining micro-evolution these fractures, including roughness, density, touristy, size, particularly under thermo-hydro-mechanical effects....

During the process of oil and gas extraction, microscopic topological structure pores, slippage effect, tortuosity migration channels play a crucial role in production permeability. In this study, an innovative research method that couples these three factors is proposed new hydro-mechanics coupling model established. This established by using power-law method, sufficiently considers effects on seepage. The results show that: (1) Compared to base case without considering both, effect...

In study of gas migration process in coal seam, the permeability evolution rule with time has been one hot topics area seam for decades. At present, view time-varying permeability, influence microstructure parameters and adsorption effect are seldom considered simultaneously. this paper, fractal seepage model coupled deformation, expansion is proposed. A multi-field coupling established by considering matrix fracture structure. The structural constant main on curve macro analyzed, including:...

As one of the most basic materials engineering coatings, rock has complex structural characteristics in its medium space. However, it is still difficult to quantitatively characterize microstructure such as connectivity and aggregation degree. For this paper, based on a CT-scan model coating, we extracted network topology coating sample verified that parameter distribution accords with Barabasi Albert (BA) scale-free theory. Based result, relying BA theory, dual-porosity was constructed. We...

The key to shale gas exploration is the characterization of migration under combination multiple factors. To address long-standing energy challenge rapidly and accurately quantifying behavior natural fractures matrix pores in at an engineering scale interaction with migration. This study proposes interdisciplinary model for extraction by adopting fractal theory. Five innovative microstructural parameters are developed characterize size pores/fractures shale, so as investigate contributions...

Coal seam contains a large number of fractures, whose shape and structure fissures are complicated, they the main channels for gas migration. Therefore, quantitative analysis internal relationship between microstructure macroscopic permeability is key issue to increase drainage volume. Some investigators discussed coal seams based on fractal theory, but mechanisms migration under influence fissure microstructures deformation still unclear. Moreover, most multi-process coupling in stage Bed...

The complex rock fracture structures in reservoirs play an important role during methane extraction. However, there is still a challenge to elucidate the impacts of adsorption–desorption, expansion, and thermal conduction on microstructures under thermal–hydrological–mechanical interactions. In this paper, fractal theory for porous media was applied characterize fractures, dimension [Formula: see text] adopted analyze density fractures microstructural evolution. We developed coupled model...

In gas-bearing coal seam mining projects, the pivotal considerations encompass assessment of gas migration, emission trends, and stability, which are crucial for ensuring both safety efficiency project. The accurate evaluation nonlinear evolution fracture network, acting as primary conduit migration influenced by disturbances, stress, overlying strata pressure, emerges a key determinant in gauging stress safety. To address industry challenge quantitatively assessing complex behaviors...