Investigation of the permeability anisotropy of porous sandstone induced by complex stress conditions

Li, Xuejian; Kang, Di; Zhang, Qiangyong; Li, Jiarun; Jiang, Rihua; Wang, Luchao

doi:10.1016/j.compgeo.2023.105309

Cited by 7 publications

(1 citation statement)

References 48 publications

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“…Hu et al [18] believed that the increase in axial stress mainly changes the number and volume of pores, which is bound to affect the rock permeability. Li et al obtained that the main direction of seepage coincides with the stress main direction and produces a priority flow channel perpendicular to the minimum principal stress [19]. This provides an idea for using lateral expansion parameters, i.e., radial strain, as the main parameters affecting permeability under the stress path of increasing axial stress.…”

Section: Introductionmentioning

confidence: 98%

Experimental Study on the Dilatancy Characteristics and Permeability Evolution of Sandstone under Different Confining Pressures

Liu,

Xie

et al. 2023

Sustainability

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It is of practical significance to investigate the dilatancy and seepage characteristics of tight sandstone gas under different confining pressures for its efficient development. Therefore, fluid–solid coupling triaxial loading experiments with gas-bearing sandstone were conducted. The results showed that the gas-bearing sandstone exhibited brittle characteristics with tensile–shear composite failure. The dual logarithmic model can better characterize the sandstone strength (R2 = 0.9952), whereas the fitting effect of the linear Mohr–Coulomb criterion is poor (R2 = 0.9294). The dilatancy capacity of sandstone was negatively correlated with confining pressure, and the dilatancy index decreased by 38.4% in the form of its convex power function with the increasing confining pressure. The sandstone underwent significant damage dilatancy during the yielding stage, resulting in a significant permeability recovery, with an increase of 67.0%~70.4%, which was greater than the decrease of 9.6%~12.6% in the elastic stage. In view of the different dominant factors of permeability reduction induced by pore compaction and recovery induced by crack development, the permeability model was established with volumetric strain and radial strain as independent variables, which could better reflect the whole process of permeability evolution.

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Section: Introductionmentioning

confidence: 98%