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Full-Text Articles in Geotechnical Engineering
Propagation Process Of Hydraulic Fracture Crossing An Orthogonal Discontinuity, Lei Chen, Guang-Qing Zhang, Min Zhang, Yu-Jie Cao, Li-Ji Shen
Propagation Process Of Hydraulic Fracture Crossing An Orthogonal Discontinuity, Lei Chen, Guang-Qing Zhang, Min Zhang, Yu-Jie Cao, Li-Ji Shen
Rock and Soil Mechanics
Massive developed discontinuities are the salient geological features of unconventional oil and gas reservoirs, and the hydraulic fractures’ capabilities of crossing the discontinuities concern the stimulation effects of hydraulic fracturing. To study the development of the fracture process zone (FPZ) when the hydraulic fracture orthogonally propagates through a discontinuity, the self-designed visual fracturing equipment was adopted to carry out hydraulic fracturing tests on sandstone plates with a prefabricated unbounded friction interface. Based on the digital image correlation method, the displacement and strain characteristics during the hydraulic fracture propagation across the orthogonal interface were monitored in real time. The test results …
Discrete Element Simulation And Experimental Study On The Initiation Pressure Of Hydraulic Fracturing, Dong Qi, Wang Yuan, Feng Di
Discrete Element Simulation And Experimental Study On The Initiation Pressure Of Hydraulic Fracturing, Dong Qi, Wang Yuan, Feng Di
Rock and Soil Mechanics
Predicting the initiation pressure of hydraulic fracturing is of great significance for oil and gas exploitation, in-situ stress measurement, and anti-cracking design of hydraulic structures. In this paper, the discontinuous numerical simulation method of particle discrete element combined with domain–pipe flow model is applied considering the fluid–solid coupling. Based on the front-advancing method, the granular model with a regular-shaped borehole is generated to analyze the meso cracking process and initiation pressure of hydraulic fracturing. According to the simulation results, the distribution of contact force chain on the borehole wall is consistent with the theoretical solution on the basis of eliminating …