Quantification of cracks and the evolution of permeability for reservoir rock under coupled THM: equipment development and experimental research

Huang, Jie; Liao, Zhiwei; Zhao, Wanchun; Wang, Dong

doi:10.1007/s40948-020-00187-5

Cited by 11 publications

(3 citation statements)

References 35 publications

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“…The 3D stress field, thermal field, and pressure field are obtained by simulating the THM coupling process in the homogeneous coal rock and the coal rock with the heterogeneity degree m = 7, 5, 3, and 1. The variation in the porosity 8 Geofluids and permeability around the borehole with time and distance from the borehole under different conditions is analyzed.…”

Section: Resultsmentioning

confidence: 99%

“…During loading of stress in the coal rock, the permeability decreases, and the P-wave velocity increases. Huang et al [8] developed a THM coupling triaxial device with the function of X-ray scanning, and the confining pressure, axial force, injected fluid pressure, and temperature are up to 20 MPa, 400 kN, 10 MPa, and 100 °C, respectively. They carried out the experiment on the gas permeability during triaxial stress loading and unloading of coal rock.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-Hydro-Mechanical Coupling Numerical Simulation on Mechanical Heterogeneity of Coal Rock

Wang

et al. 2022

Geofluids

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Coal rock is a porous medium composed of organic matter and inorganic minerals, and it is very complex and highly heterogeneous. Coal bed methane (CBM) production is a thermo-hydro-mechanical (THM) coupling process in heterogeneous coal rock. THM coupling numerical simulation on the coal rock by considering the effect of mechanical heterogeneity is rarely reported. We use Weibull’s probability density distribution function to characterize the heterogeneity in elastic modulus of the coal rock, establish a THM coupling 3D finite element model of the coal rock by considering the variation in pore pressure caused by methane desorption, the linear thermal expansion effect, and coal rock skeleton shrinkage and deformation, and analyze variation in permeability, porosity, stress, temperature, and pore pressure within the coal rock representative elementary volume (REV) of variable mechanical heterogeneity with the cross-coupling correlation between permeability and porosity, and thermal field, stress field, and pressure field. The results show that the evolution of porosity and permeability in the coal rock is a THM coupling process related to mechanical heterogeneity, thermal expansion effect, pore pressure change caused by CBM desorption, and stressed deformation in the coal rock skeleton. The permeability and porosity fluctuate within the heterogeneous coal rock. The permeability and porosity fluctuate more frequently in the coal rock with stronger mechanical heterogeneity. The mechanical heterogeneity promotes local stress concentration. The time for variation in the stress through the whole the coal rock REV and the value of the first principal stress increase when the coal rock heterogeneity is enhanced. Under the THM coupling effect, the strong heterogeneity of the coal rock causes fluctuation in the thermal field. The evolution of coal porosity and permeability is a THM coupling process. This study provides theoretical guidance for CBM exploitation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermo-Hydro-Mechanical Coupling Numerical Simulation on Mechanical Heterogeneity of Coal Rock

Wang

et al. 2022

Geofluids

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“…According to the physical parameters of coalbed and CBM measured in the study area, a coefficient partial differential equation (PDE) is established. Its simultaneous solution can describe the heat conduction equation and linear elastic deformation equation of CBM flowing in the coalbed [35][36][37].…”

Section: Types Of Gas-controlling Structures In the Guojiahementioning

confidence: 99%

Analysis of Gas Content and Permeability Change Pattern of a Coal Reservoir in the Tectonic Positions Based on a THM Coupled Model

Hou

et al. 2021

Geofluids

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The theory of coalbed methane distribution controlled by tectonism is a hot issue in the field of geofluid-geotectonic interaction research. Taking the geological structure in the scale range of the 1302 working face of a Guojiahe wellfield in a Yonglong mining area as the background, this paper focuses on the basic research problem of the influence of geological structure on the control of coal reservoir gas content and uses a THM coupling model to analyze the change of coalbed gas content and distribution characteristics of different tectonic positions. The change of CBM content and permeability in the anticline, syncline, and faults is analyzed. Accordingly, the variation distance of gas content and reservoir permeability controlled by tectonism of different geological structures is quantified to provide guidance for the selection of CBM-favorable areas. The research results show that the gentle dip syncline hinge zone is a potential gas-rich area with heat preservation and low permeability, while the gentle dip anticline hinge zone is a gas-poor area with low temperature and low pressure and high permeability. The thick coal seam zone of the syncline hinge zone is the potential gas accumulation zone, and the high-permeability area is near the fault plane of a normal fault. The coal matrix near the normal fault is subjected to tensile tectonic stresses to form tensional fissures, and the coal seam in the fault plane area is susceptible to coalbed gas dispersion and increases the permeability of the coal reservoir. The variation distance of gas content and reservoir permeability controlled by the normal fault within the Guojiahe wellfield is 37 m and 54 m from the fault plane, respectively.

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Temperature-dependent evolution of permeability and pore structure of marble under a high-temperature thermo-hydro-mechanical coupling environment

Meng,

Zhang,

Taherdangkoo

et al. 2024

Acta Geotech.

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Quantification of cracks and the evolution of permeability for reservoir rock under coupled THM: equipment development and experimental research

Cited by 11 publications

References 35 publications

Thermo-Hydro-Mechanical Coupling Numerical Simulation on Mechanical Heterogeneity of Coal Rock

Thermo-Hydro-Mechanical Coupling Numerical Simulation on Mechanical Heterogeneity of Coal Rock

Analysis of Gas Content and Permeability Change Pattern of a Coal Reservoir in the Tectonic Positions Based on a THM Coupled Model

Temperature-dependent evolution of permeability and pore structure of marble under a high-temperature thermo-hydro-mechanical coupling environment

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