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Numerical study of hydraulic characteristics of shale fractures during unloading-induced slipping: Effects of inclination angle and unloading rate
https://orcid.org/0000-0001-9957-1230
Abstract This study investigates the roles of inclination angle of fracture (θ) and unloading rate of confining pressure (U r) on the hydraulic characteristics of shale fractures during the unloading-induced slipping process. A series of fluid flow simulations in the directions both parallel (x-directional) and perpendicular (y-directional) to the shear direction at different shear displacements (d s) were performed. The results show that the channeling effect is more pronounced in the y-direction than that in the x-direction. As d s increases, the fluid flow becomes less anisotropic, and the ratio of permeability in the y-direction (K y) to that in the x-direction (K x) gradually decreases first and then remains almost constant. Both K x and K y greatly increase with increasing in θ. The U r significantly affects the permeability when d s increases to a certain value (i.e., 0.8 mm in this study). The efficiency of permeability enhancement represented by ΔK/Δd s is evaluated. The mean ΔK/Δd s during the slipping process for samples with θ = 50° is 4.73 times and 5.25 times larger than that for samples with θ = 30° in the x-direction and y-direction, respectively. With increasing U r, the mean ΔK/Δd s slightly increases first and then decreases. The occurrence of stick–slip events may control the ΔK/Δd s.
Numerical study of hydraulic characteristics of shale fractures during unloading-induced slipping: Effects of inclination angle and unloading rate
https://orcid.org/0000-0001-9957-1230
Abstract This study investigates the roles of inclination angle of fracture (θ) and unloading rate of confining pressure (U r) on the hydraulic characteristics of shale fractures during the unloading-induced slipping process. A series of fluid flow simulations in the directions both parallel (x-directional) and perpendicular (y-directional) to the shear direction at different shear displacements (d s) were performed. The results show that the channeling effect is more pronounced in the y-direction than that in the x-direction. As d s increases, the fluid flow becomes less anisotropic, and the ratio of permeability in the y-direction (K y) to that in the x-direction (K x) gradually decreases first and then remains almost constant. Both K x and K y greatly increase with increasing in θ. The U r significantly affects the permeability when d s increases to a certain value (i.e., 0.8 mm in this study). The efficiency of permeability enhancement represented by ΔK/Δd s is evaluated. The mean ΔK/Δd s during the slipping process for samples with θ = 50° is 4.73 times and 5.25 times larger than that for samples with θ = 30° in the x-direction and y-direction, respectively. With increasing U r, the mean ΔK/Δd s slightly increases first and then decreases. The occurrence of stick–slip events may control the ΔK/Δd s.
Numerical study of hydraulic characteristics of shale fractures during unloading-induced slipping: Effects of inclination angle and unloading rate
https://orcid.org/0000-0001-9957-1230
Abstract This study investigates the roles of inclination angle of fracture (θ) and unloading rate of confining pressure (U r) on the hydraulic characteristics of shale fractures during the unloading-induced slipping process. A series of fluid flow simulations in the directions both parallel (x-directional) and perpendicular (y-directional) to the shear direction at different shear displacements (d s) were performed. The results show that the channeling effect is more pronounced in the y-direction than that in the x-direction. As d s increases, the fluid flow becomes less anisotropic, and the ratio of permeability in the y-direction (K y) to that in the x-direction (K x) gradually decreases first and then remains almost constant. Both K x and K y greatly increase with increasing in θ. The U r significantly affects the permeability when d s increases to a certain value (i.e., 0.8 mm in this study). The efficiency of permeability enhancement represented by ΔK/Δd s is evaluated. The mean ΔK/Δd s during the slipping process for samples with θ = 50° is 4.73 times and 5.25 times larger than that for samples with θ = 30° in the x-direction and y-direction, respectively. With increasing U r, the mean ΔK/Δd s slightly increases first and then decreases. The occurrence of stick–slip events may control the ΔK/Δd s.
Numerical study of hydraulic characteristics of shale fractures during unloading-induced slipping: Effects of inclination angle and unloading rate
Zhu, Xinjie (author) / Ji, Haoqi (author) / Liu, Richeng (author) / Yu, Liyuan (author) / Wang, Yingsen (author)
2023-09-18
Article (Journal)
Electronic Resource
English
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