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首页> 外文期刊>Journal of Petroleum Science & Engineering >Stress sensitivity of medium- and high volatile bituminous coal: An experimental study based on nuclear magnetic resonance and permeability-porosity tests
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Stress sensitivity of medium- and high volatile bituminous coal: An experimental study based on nuclear magnetic resonance and permeability-porosity tests

机译：中高挥发沥青煤的应力敏感性：基于核磁共振和渗透性孔隙度测试的实验研究

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摘要

Coalbed methane (CBM) development is in progress in northwestern China, where there are deposits of medium volatile bituminous coal (MVBC) and high volatile bituminous coal (HVBC). Stress sensitivity can lead to low gas-production during CBM development. In this study, three groups of HVBC samples and one group of MVBC samples are applied for low-field nuclear magnetic resonance (LF-NMR) and permeability-porosity tests (P-PT) under confining pressure. Each group contained two cores with similar physical properties, and one is used for LF-NMR and the other for P-PT under confining pressure. The key apertures dominating the reduction of permeability are revealed by comparative analysis of the results of LF-NMR and PP-T under confining pressure. Influences of multiscale pores and structure of macro-pores and fractures (MP-F) on stress sensitivity are discussed. In addition, this paper discusses the methods for determination of compressibility coefficients. The results shows that MP-F are the key apertures influencing stress sensitivity. Compressibility of macro-pore is the greatest, followed by mesopores (MEP), and that of micro-pores and transition pores (MP-TP) is the lowest. Stress sensitive stages are influenced by structure of MP-F. Method A (based on P-PT) is suitable for calculating compressibility coefficient of coal with a high proportion of MP-F and method B (based on LF-NMR) has advantages for calculating compressibility coefficients of MP-TP, MEP, and MP-F, respectively. An improved model, considering matrix deformation of low rank coal and compressibility coefficient of key apertures, is proposed to calculate permeability under increased effective stress.
机译：煤层气（CBM）发展正在中国西北部正在进行中，其中存在中等挥发性烟煤（MVBC）和高挥发性烟煤（HVBC）的沉积物。应激敏感性可导致CBM发育过程中的低气体生产。在该研究中，在限制压力下施加三组HVBC样品和一组MVBC样品和渗透性孔隙率试验（P-PT）。每组含有两个具有相似物理性质的核心，并且在限制压力下用于LF-NMR和另一种用于P-PT的核。通过在限制压力下对LF-NMR和PP-T的结果进行比较分析，揭示了主导渗透性降低的关键孔。讨论了多尺度孔隙和结构的影响和裂缝和裂缝（MP-F）对应力敏感性的影响。此外，本文讨论了测定压缩系数的方法。结果表明，MP-F是影响应力敏感性的关键孔。宏观孔的可压缩性是最大的，其次是中孔（MEP），微孔和过渡孔（MP-TP）是最低的。应力敏感阶段受MP-F结构的影响。方法A（基于P-PT）适用于计算具有高比例的MP-F和方法B（基于LF-NMR）的煤的可压缩系数具有用于计算MP-TP，MEP和MP的压缩性系数的优点-f分别。考虑到低级煤的基质变形和关键孔的可压缩系数的基质变形，提出了一种改进的模型，以计算增加有效应力下的渗透率。

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