CO2 energized fracturing initiation pressure prediction method under model driving mode condition

The invention relates to a CO2 energized fracturing initiation pressure prediction method under a model driving mode condition, which comprises the following steps of: (1) establishing a fluid-solid coupling model of CO2 fluid, designing a simulation experiment, and changing eight influence factors...

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Hauptverfasser: ZHANG LIANG, DA YINPENG, HAN LEI, TOKIKATA, JIANG SHU, BU JUN, ZHANG WEIDONG, NI HONGJIAN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention relates to a CO2 energized fracturing initiation pressure prediction method under a model driving mode condition, which comprises the following steps of: (1) establishing a fluid-solid coupling model of CO2 fluid, designing a simulation experiment, and changing eight influence factors to obtain a simulated initiation pressure result; (2) selecting a random forest algorithm to carry out parameter prediction processing; (3) selecting a CMA-ES algorithm in the meta-heuristic algorithm as a hyper-parameter optimization algorithm; (4) using a CMA-ES algorithm to complete hyper-parameter optimization of the random forest algorithm; and (5) taking 80 groups of simulated crack initiation pressure results driven by the model as output parameters, and taking 8 influence factors as input parameters. (6) performing algorithm simulation to obtain a characteristic factor of each parameter, and sequencing influence factors; and (7) establishing a fitting model between the crack initiation pressure and the eigh