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Supercritical COsub.2 Injection-Induced Fracturing in Longmaxi Shales: A Laboratory Study
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Supercritical COsub.2 Injection-Induced Fracturing in Longmaxi Shales: A Laboratory Study
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Journal Article
Supercritical COsub.2 Injection-Induced Fracturing in Longmaxi Shales: A Laboratory Study
2025
Overview
Although supercritical CO[sub.2] (SC-CO[sub.2]) fracturing has shown promise in oil and gas development with demonstrated potential, its application in shale gas extraction remains in its infancy globally. In this study, fracturing experiments were conducted with water, liquid CO[sub.2] (L-CO[sub.2]), and SC-CO[sub.2], as well as SC-CO[sub.2] at varying pump rates. The results reveal that SC-CO[sub.2] fracturing produces a highly complex fracture network characterized by fractures of varying numbers, deflection angles, and tortuosity. Analysis of CO[sub.2] temperature and pressure data showed a sharp drop in injection pressure and temperature at breakdown, followed by fluctuations until injection stopped. Acoustic emission (AE) monitoring demonstrated that energy released during main fracture initiation significantly exceeded that from CO[sub.2] phase transition-driven fracture extension, underscoring the dominant role of main fractures in energy dissipation. Compared to hydraulic fracturing, SC-CO[sub.2] fracturing created a seepage area 2.2 times larger while reducing the breakdown pressure by 37.2%, indicating superior stimulation performance. These findings emphasize the potential of SC-CO[sub.2] to form intricate fracture networks, offering a promising approach for efficient shale gas extraction.
Publisher
MDPI AG
Subject
