Impact of Effective Stress and Surface Roughness on Nonlinear Gas Flow in Shale Fractures

Huang, Ting; Zhai, Cheng; Liu, Ting; Xu, Jizhao; Sun, Yong; Zheng, Yangfeng; Zhu, Xinyu

doi:10.1007/s11053-023-10243-y

Cited by 7 publications

(4 citation statements)

References 61 publications

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“…The distribution of flow characteristics for shale gas through the fracture was analyzed in terms of mechanical properties, pressure, flow velocity, and nonlinear flow characteristics. The input parameters required for this model were derived and calibrated from the previous experimental data . The parameters are listed in Table .…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…In this study, the numerical theoretical model was validated in terms of the nonlinear flow characteristics through the shale fracture according to the flow test results . The numerical simulations followed flow test conditions, in which the inlet pressure was increased from 0.2 to 2.0 MPa at an effective stress of 15 MPa.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…In this study, the numerical theoretical model was validated in terms of the nonlinear flow characteristics through the shale fracture according to the flow test results. 55 The numerical simulations followed flow test conditions, in which the inlet pressure was increased from 0.2 to 2.0 MPa at an effective stress of 15 MPa. The volume flow rate at the outlet was extracted, and the absolute and relative errors were computed by integrating the simulation and experimental data results, as shown in Table 2.…”

Section: Model Validationmentioning

confidence: 99%

“…The input parameters required for this model were derived and calibrated from the previous experimental data. 55 The parameters are listed in Table 1.…”

Section: Geometric Model and Boundarymentioning

confidence: 99%

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A Numerical Study of Nonlinear Gas Flow in Shale Anisotropic Fracture Under Effective Stress

Huang,

Zhai,

Liu

et al. 2024

Energy Fuels

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The anisotropy of surface roughness in shale fractures affects gas flow characteristics, which are crucial to evaluating shale gas production. However, the coupled relationship among surface roughness distribution, effective stress, and gas flow in a shale fracture has not been quantified sufficiently. This study numerically investigated the nonlinear gas flow in shale anisotropic fracture under varying effective stresses. The results show that the anisotropy of the roughness characteristics for shale fracture is characterized by autocorrelation function. The stress field distribution and flow characteristics on the fracture show distinct layering patterns: hourglass layering for stress, parallel layering for pressure, and elliptical layering for velocity. As shale gas transports from profile lines of x = 1 mm to x = 85 mm, the average pressure loss rate increment increases from 0.055% MPa −1 to 3.875% MPa −1 , demonstrating an enhanced effect of effective stress on the flow with increasing x value. Furthermore, in microscale shale fracture, flow velocity variation dominates in determining flow rate compared to fracture aperture variation during loading. Finally, as effective stress increases, fracture closure variation among different profile lines becomes increasingly significant, while relative differences in friction coefficient and Reynolds number among lines show a negative correlation with effective stress.

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Section: Numerical Simulation Methodsmentioning

confidence: 99%

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

“…The input parameters required for this model were derived and calibrated from the previous experimental data. 55 The parameters are listed in Table 1.…”

Section: Geometric Model and Boundarymentioning

confidence: 99%

See 2 more Smart Citations