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- W2726952495 abstract "Parameters optimization during fracturing to form fracture networks is important to improve the permeability of reservoirs. In this paper, fracture growth in natural coal-rock blocks under different stresses with different fracturing medium and injection rates was studied, and the injection pressure evolution and acoustic emission dynamic response were further analyzed. The results indicate that the stress state, fracturing medium and injection flow rate significantly affected the fracture propagation behavior. When the stress difference was greater than or equal to 7 MPa (Δσ≥7MPa), the fracture could penetrate the coal-rock interface. In the same stress state (σv=12MPa,σH=8MPa,σv=5MPa), the fracture geometry and injection pressure evolution significantly differed when using different fracturing media (SC–CO2 and H2O). When supercritical CO2 (SC–CO2) was used as the fracturing medium, secondary fractures were created with small residual fracture widths. When H2O fracturing was adopted, single and straight fractures were obtained with a large residual fracture width, penetrating the coal-rock interface straightly. There existed significant differences in the critical stress difference, injection pressure evolution and the acoustic emission dynamic response between natural and artificial coal-rock block fracture during interface penetration. The results could provide important references for fracturing parameter optimization in the efficient exploitation of coalbed methane." @default.
- W2726952495 created "2017-07-14" @default.
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- W2726952495 date "2017-09-01" @default.
- W2726952495 modified "2023-10-10" @default.
- W2726952495 title "Creating a network of hydraulic fractures by cyclic pumping" @default.
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- W2726952495 doi "https://doi.org/10.1016/j.ijrmms.2017.06.009" @default.
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