| Citation: |
LIU Houbin, WANG Shuang, DU Shuang, et al. Study on the dynamic evolution law of ground stress field in shale fractured reservoirs [J]. Petroleum Drilling Techniques, 2025, 53(4)：1−9. DOI: 10.11911/syztjs.2025049
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The stress environment of shale reservoirs undergoes dynamic changes during hydraulic fracturing operations, potentially inducing wellbore and formation damage. These changes directly influence the orientation and extent of fracture network propagation, subsequently impacting the optimization of fracturing strategies and ultimate development efficiency. To overcome the inability of conventional integrated geological and engineering 3D static models to accurately capture the dynamic evolution of the in-situ stress field during hydraulic fracturing, a 4D dynamic geostress-flow-stress fully coupled simulation method based on the finite difference method was developed. This approach comprehensively considers shale lamination heterogeneity, geomechanical properties, and the complexity of fracture network propagation. The simulation captures the complete process from the initial in-situ stress field under realistic formation conditions to stress perturbations induced by pore pressure diffusion during fracturing. It offers a multi-dimensional and multi-scale analysis of the impact of horizontal well hydraulic fracturing on regional stress fields. Results show that as hydraulic fractures initiate during the fracturing process, the fracturing fluid infiltrates the formation through the fracture network around the wellbore. This leads to an outward transmission of wellbore pressure, resulting in increased pore pressure and a reduction in effective and in-situ stresses, with the minimum horizontal stress showing the greatest decrease. With the expansion of the pressure-affected zone, pore pressure and in-situ stress variations are most pronounced near the wellbore. This results in stress concentration and a pressure-drop funnel effect relative to the undisturbed far-field formation, inducing formation deformation and compression that alter the orientation of the in-situ stress field. The integration of refined geological modeling with a fully coupled finite element framework for simulating dynamic in-situ stress fields in fractured reservoirs offers valuable insights and practical references for optimizing shale reservoir hydraulic fracturing in field applications.
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Sponsor：Sinopec Research Institute of Petroleum Engineering
Serial Number：CN 11-1763/TE, ISSN 1001-0890
Chief Editor： WANG Minsheng
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