Abstract
The evaluation of hydraulic fracturing effectiveness in unconventional oil and gas reservoirs is crucial for production enhancement. Traditional assessments have focused on rock properties, overlooking the influence of external factors such as geostress and fracturing fluid characteristics. Acoustic emission methods, which analyze fracture activities and parameters through inversion, have shown potential in evaluating the fracturing effectiveness by indicating complex fracture networks and the dynamics of microcrack coalescence. However, these methods face challenges in accurately determining fracture parameters due to the inversion's inherent uncertainties. This study introduces a novel inversion method that incorporates geomechanical constraints, aiming to improve the precision of fracturing effectiveness evaluation. By comparing high-viscosity gel and supercritical carbon dioxide (SC-CO2) fracturing techniques, the study demonstrates the novel method has capability to distinguish between varied fracture morphologies. The results show that high-viscosity fracturing leads to fractures with more concentrated propagation directions and larger opening angles, while SC-CO2 fracturing produces fractures with more complex propagation paths and smaller opening angles. This approach marks a significant advancement in the field, allowing for a more accurate and quantitative assessment of hydraulic fracturing operation.
Published Version
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