循环加卸载条件下破碎碳质页岩渗流特征,Energy & Fuels

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循环加卸载条件下破碎碳质页岩渗流特征
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-12-28 , DOI: 10.1021/acs.energyfuels.3c04160
Lei Zhang _{1,

2} , Xiaochuan Yuan _{1,

2} , Liang Luo ₁ , Ye Tian ₁ , Shipan Zeng ₁

Affiliation

本研究开展了破碎页岩在循环加卸载条件下的渗流实验，研究了不同粒径破碎页岩在应力扰动下的渗透特性。采用六组不同粒度的破碎页岩样品，进行3次装卸循环测试破碎页岩的渗透率。分析了循环次数和页岩粒度对渗透率损害的影响。进一步建立破碎页岩应力-渗流模型，分析不同加卸载阶段下循环次数和页岩粒度对破碎页岩应力敏感性变化的影响。结果表明，破碎页岩的初始渗透率、渗透率损伤和应力敏感性与循环次数呈负相关，且首循环对其影响显着。随着破碎页岩颗粒尺寸的增大，实验前后页岩渗透率的变化率也增大。这导致页岩损伤渗透率更大。然而，循环次数对页岩渗透率损害的影响减小。此外，页岩的应力敏感性变得更强。研究还发现，6种不同粒径的破碎页岩样品中，小粒径（G1~G4，0~6.8 mm）和大粒径（G5~G6，7~15 mm）的渗流特性存在差异。。此外，讨论了循环加卸载条件下页岩颗粒结构的变化，并研究了页岩渗透率变化的机理。该研究揭示了循环加卸载条件下破碎页岩的渗流特征，对页岩气井安全高效开采具有一定的指导意义。

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Seepage Characteristics of Broken Carbonaceous Shale under Cyclic Loading and Unloading Conditions

This study conducted a seepage experiment of broken shale under cyclic loading and unloading conditions to investigate the permeability characteristics of broken shale with different particle sizes under stress disturbance. There were six groups of broken shale samples with different particle sizes, and three cycles of loading and unloading were conducted to test the permeability of broken shale. The influence of the number of cycles and shale particle size on permeability damage was analyzed. Furthermore, the stress-seepage model of broken shale was established to analyze the influence of the number of cycles and shale particle size on the variation of stress sensitivity of broken shale under different loading and unloading stages. The results show that the initial permeability, permeability damage, and stress sensitivity of broken shale are negatively correlated with the number of cycles and that the first cycle has a significant impact on them. As the size of the broken shale particles increases, the rate of change in shale permeability also increases before and after conducting experiments. This results in a greater shale damage permeability. However, the impact of the number of cycles on shale permeability damage decreases. Additionally, the shale’s stress sensitivity becomes stronger. It is also found that the seepage characteristics between the small particle size (G1–G4, 0–6.8 mm) and the large particle size (G5–G6, 7–15 mm) are different in the broken shale samples with six different particle sizes. In addition, the change of the shale particle structure under cyclic loading and unloading conditions is discussed, and the mechanism of the shale permeability change is studied. This study indicates the seepage characteristics of broken shale under cyclic loading and unloading conditions, which has a certain guiding significance for the safe and efficient extraction of shale gas wells.

更新日期：2023-12-28

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