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EXPERIMENTAL INVESTIGATION ON THE IMPACT OF INITIAL PORE PRESSURE ON BREAKDOWN PRESSURE OF BOREHOLE RADIAL FRACTURE FOR UNSATURATED MORTAR HYDRAULIC FRACTURING UNDER TRUE TRIAXIAL STRESS

卷 21, 册 11, 2018, pp. 1041-1057
DOI: 10.1615/JPorMedia.2018021402
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摘要

According to the conventional theory of hydraulic fracturing, breakdown pressure decreases with an increase in initial pore pressure. However, in the practice of hydraulic fracturing for gassy coal seams, the higher the gas pressure, the higher the pumping water pressure required to inject into the coal seam. The initial pore gas pressure leads to an increase in water injection pressure. How does the initial pore pressure affect the hydraulic fracturing of unsaturated rock and its breakdown pressure? Experiments on hydraulic fracturing for unsaturated cement mortar samples (300 mm × 300 mm × 300 mm) with five degrees of initial pore pressures were conducted. The influencing law of initial pore pressure on breakdown pressure of borehole radial fracture in hydraulic fracturing was studied with a large-sized true triaxial hydraulic fracturing experimental system. The experimental results show that the hydraulic fracturing of rock is primarily controlled by the stress field, initial pore pressure, and water injection pressure. A critical pore pressure gradient exists for the initiation and propagation of hydraulic fracture. When the pore pressure gradient reaches a critical point, the fracture in rock will occur. With an increase in initial pore pressure, the breakdown pressure of rock increases. The subsequent propagation pressure of hydraulic fracture also increases with an increase in initial pore pressure.

对本文的引用
  1. Zhao Xinglong, Huang Bingxiang, Xu Jie, Experimental investigation on the characteristics of fractures initiation and propagation for gas fracturing by using air as fracturing fluid under true triaxial stresses, Fuel, 236, 2019. Crossref

  2. Lu Weiyong, He Changchun, Numerical simulation on the effect of pore pressure gradient on the rules of hydraulic fracture propagation, Energy Exploration & Exploitation, 39, 6, 2021. Crossref

  3. Safari Varzaneh Ali Asghar, Ahmadi Morteza, Goshtasbi Kamran, Simulation of hydraulic fracturing and Darcy fluid flow in a porous medium using a coupled Discrete Element Method with fluid flow, Journal of Petroleum Science and Engineering, 204, 2021. Crossref

  4. Zhao Xinglong, Huang Bingxiang, Chen Bin, Hou Mingxiao, Xiong Hao, Experimental Investigation of the Effect of Evenly Distributed Pore Pressure on Rock Damage, Lithosphere, 2021, Special 4, 2022. Crossref

  5. Chen Liang, Fan Gangwei, Zhang Dongsheng, Fan Zhanglei, Wang Xufeng, Zhang Wei, Yao Nan, Numerical Simulation of Crack Initiation and Propagation Evolution Law of Hydraulic Fracturing Holes in Coal Seams Considering Permeability Anisotropy and Damage, Minerals, 12, 4, 2022. Crossref

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