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- W2912972024 abstract "Perforations play an important role in hydraulic fracturing as channels of fracturing fluid penetrating into reservoirs. The perforation geometry and the geo-stresses of reservoirs could affect the initiation pressures (i.e. the critical hydraulic pressure as perforation tips start to initiate), and the fracture initiation direction which could affect the fracturing fluid flowing into reservoirs. In this paper, two collinear perforations emanating from a wellbore were considered, and by using conformal mapping techniques, the stress intensity factors (SIFs) of mode I and mode II at the perforation tips were obtained. According to the maximum tangential stress criterion, i.e. MTS criterion, the analytical solutions of the initiation pressures and the initiation angles at perforation tips were obtained. The theoretical results were compared with the previous test results by using cubic concrete models and the previous in-situ measuring results. The prediction results of initiation pressures generally agreed with the test results and the in-situ results. Finally, the effects of perforation lengths, perforation angles with the major principal stress and the principal stress difference on hydraulic fracturing were analyzed. The results showed that the optimal perforation angles should lie in the range from 0° to 30°, and the optimal perforation length should 2 or 3 times the wellbore diameter." @default.
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- W2912972024 date "2019-05-01" @default.
- W2912972024 modified "2023-10-15" @default.
- W2912972024 title "The effects of some parameters on perforation tip initiation pressures in hydraulic fracturing" @default.
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- W2912972024 doi "https://doi.org/10.1016/j.petrol.2019.02.028" @default.
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