剪切滑移过程中烟煤断裂的渗透性演变

IF 5.3 3区 工程技术 Q2 ENERGY & FUELS
Zhe Zhou*, Meiyu Sheng, Zhaolong Ge, Shihui Gong, Qisi Huai, Junhui Mou and Fan Wang, 
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引用次数: 0

摘要

通过体积压裂提高储层渗透率以形成复杂煤层网络的方法是开采煤层气的一种新方法。煤岩节理裂缝强度较低,了解裂缝剪切滑移过程中的渗透率演变对于评估煤层压裂的可行性和预测煤层气产能至关重要。因此,本研究以鄂尔多斯盆地不同灰分含量的烟煤为研究对象,通过剪切渗流实验研究断裂剪切滑移过程中的渗透率演变。通过分析烟煤的矿物成分和滑移前后裂缝表面的三维形态变化,阐明了烟煤裂缝的渗透率演化机理。结果表明,烟煤裂缝的渗透率在剪切滑移过程中会下降,降幅在 12.89% 到 93.65% 之间。三种烟煤的平均渗透率降幅分别为 88.45%、22.63% 和 52.24%。此外,在剪切滑移过程中,随着层状硅酸盐含量的增加,烟煤透气性的下降幅度也在增加。机械性能较弱的烟煤 A 在滑移率突变时的平均渗透率变化为 -5.93%,明显高于烟煤 B(0.59%)和烟煤 C(-2.59%)。机械性能较弱、层状硅酸盐含量较高的烟煤裂缝在剪切应力作用下表现出更大的破坏,导致渗透率下降幅度增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Permeability Evolution of Bituminous Coal Fractures during the Shear Slip Process

Permeability Evolution of Bituminous Coal Fractures during the Shear Slip Process

The method of enhancing reservoir permeability through volumetric fracturing to create a complex seam network presents a novel approach for extracting coalbed methane. Coal rock joint fractures exhibit low strength, and comprehending the permeability evolution during fracture shear slip is crucial for evaluating the viability of coal bed fracturing and forecasting coal bed methane production capacity. Hence, this study focuses on bituminous coals with varying ash contents in the Ordos Basin to investigate the permeability evolution during fracture shear slip through shear seepage experiments. By analysis of the mineral components of bituminous coals and the three-dimensional morphology changes of fracture surfaces before and after slip, the permeability evolution mechanism of bituminous coal fractures is elucidated. The results show that the permeability of bituminous coal fractures decreases during shear slip, with reductions ranging from 12.89 to 93.65%. On average, the permeability decrease for the three types of bituminous coals is 88.45, 22.63, and 52.24%, respectively. Furthermore, the decrease in permeability of bituminous coal increases with the rise in the laminated silicate content during shear slip. Bituminous coal A, characterized by weaker mechanical properties, experienced an average permeability change of −5.93% during sudden slip rate alterations, significantly higher than that of bituminous coal B (0.59%) and bituminous coal C (−2.59%). Bituminous fractures with weaker mechanical properties and higher laminated silicate content exhibited greater damage under shear stress, resulting in an increased permeability drop.

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来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
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