STUDY OF THE INTERACTION BETWEEN MICROSTRUCTURE AND MACROSCOPIC BEHAVIOR FOR HYDRAULIC FRACTURING AREAS DURING SHALE GAS EXTRACTION

Ning Luo, Yunchen Suo, Dayu Ye, Guannan Liu, Jing Wang, Jingyun Zhu and Cheng Zhai ()
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Ning Luo: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China†Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Yunchen Suo: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China†Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Dayu Ye: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China†Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Guannan Liu: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China†Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China‡Laboratory of Mine Cooling and Coal-heat Integrated Exploitation, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Jing Wang: �School of Qilu Transport, Shandong University, Jinan, Shandong 250000, P. R. China
Jingyun Zhu: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China†Mechanics and Civil Engineering Institute, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Cheng Zhai: �School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

FRACTALS (fractals), 2022, vol. 30, issue 03, 1-13

Abstract: Horizontal drilling is the major method of shale gas extraction, and hydraulic fracturing improves the gas production effectively. However, as the main gas migration channel, shale microstructures, such as the natural fractures and pores, are extremely complicated, and it is difficult to characterize them quantitatively by conventional approaches. Besides, the microstructural evolution of the hydraulic fracture (HF) area is more intricate. In order to quantitatively characterize the evolution of shale microstructure after hydraulic fracturing, and to investigate the contribution to the gas extraction process, a fully coupled fractal thermal–hydrological–mechanical permeability model is proposed. And the interaction of shale microstructure, thermal–hydrological–mechanical effects, and gas permeability in the HF area is also quantitatively investigated. Shale thermal conduction, gas pressure, and adsorption–desorption effect are defined as functions of the effective stress responsible for shale matrix deformation, and operate directly on shale porosity, which induces changes in shale microstructure, including the shale fractal dimension (for characterizing the density of natural fractures in shale) and the maximum fracture length. Multiphysical effects have a major impact on gas seepage, and directly affecting the permeability. Furthermore, compared to the widely used cubic permeability model, this model is significantly superior in analyzing the permeability evolution in the hydraulically fractured area, and the reliability is verified by the production data from the Marcellus Shale.

Keywords: Gas Permeability; Shale Microstructure; Fractal Model; Multiphysical Field (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218348X2250044X

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