Maintaining the fracture network created by hydraulic fracturing remains challenging because unpropped fractures close during production, resulting in shale gas production decline. Chemical dissolution is being implemented to maintain unpropped fracture conductivity, and the effect of oxidative dissolution on organic-rich shale may have the potential to maintain these fractures. In this paper, the change of organic matter (OM) in crushed shale samples exposed to hydrogen peroxide (H₂O₂) or deionized water were characterized. Reaction kinetics experiments were run using sliced shale samples and H₂O₂ with a mass concentration of 2–10% at temperature of 40–80 °C. Stress sensitivity of fractured shale plugs after oxidation for 72 h was evaluated. Results show H₂O₂ can remove 56.87% of solid OM and 55.34% of extractable OM in the crushed sample. Total organic carbon in H₂O₂ filtrate after the reaction is 91.36 mg/L,while that of deionized water is 30.88 mg/L. A significant decrease of C–O according to the C1s and O1s spectra of the crushed samples after oxidation means that some of oxygen contained functional groups oxidized and cleaved. However, reaction rate of oxidative dissolution occurs slowly and significantly depends on the concentration and temperature. The relationship between reaction rate and concentration can be described as a power function, and the relationship between reaction rate and temperature can be described as an exponential function. Activation energy of oxidative dissolution ranges from 3.51 to 12.10 kJ/mol when H₂O₂ mass concentration ranges from 2% to 10%. Oxidative dissolution can increase fracture width judging by estimation based on the mass loss. Stress sensitivity coefficient of the plugs treated with deionized water are 0.52 and 0.59, while the plugs treated with H₂O₂ are 0.48 and 0.52. It indicates that oxidative fluids can play a role in maintaining unpropped fracture conductivity enhancing shale gas recovery.

保持由水力压裂产生的裂缝网络仍然具有挑战性，因为未支撑的裂缝在生产过程中会闭合，导致页岩气产量下降。正在实施化学溶解以维持无支撑的裂缝电导率，并且氧化溶解对富含有机物的页岩的影响可能具有维持这些裂缝的潜力。本文描述了暴露于过氧化氢（H ₂ O ₂）或去离子水的压碎页岩样品中有机质（OM）的变化。使用切片的页岩样品和H ₂ O ₂进行反应动力学实验在40–80°C的温度下质量浓度为2–10％。评估了氧化72小时后页岩裂缝的应力敏感性。结果表明，H ₂ O ₂可以去除粉碎样品中56.87％的固体OM和55.34％的可萃取OM。H ₂ O _2中的总有机碳反应后滤液为91.36 mg / L，去离子水为30.88 mg / L。氧化后，根据粉碎样品的C1s和O1s谱图，C–O明显降低，这意味着一些氧中含有被氧化和裂解的官能团。然而，氧化溶解的反应速率发生缓慢，并且显着取决于浓度和温度。反应速率和浓度之间的关系可以描述为幂函数，反应速率和温度之间的关系可以描述为指数函数。H ₂ O ₂时氧化溶解的活化能为3.51至12.10 kJ / mol质量浓度范围为2％至10％。通过基于质量损失的估算，氧化溶解可以增加裂缝宽度。用去离子水处理的塞子的应力敏感系数分别为0.52和0.59，而用H ₂ O ₂处理的塞子的应力敏感性系数分别为0.48和0.52。这表明氧化液可以在维持未支撑的裂缝电导率方面发挥作用，从而提高页岩气的采收率。