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Experimental study on permeability stress sensitivity of reconstituted granular coal with different lithotypes

机译:不同岩性重构粒煤的渗透应力敏感性试验研究

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摘要

Coal permeability has been identified as one of the key factors affecting coalbed methane (CBM) extraction. CBM drainage and hydraulic fracturing usually lead to coal fines output. Some of these coal fines passed through wellbore discharged of coal bed, and some of them were compacted in fractures during the closing of fractures (or cleats) under the confining pressure. The pore distribution and seepage path of those compacted coal fines are different from natural coal. In this study we used reconstituted coal as a research material to study porosity and permeability characteristics of compacted coal fines in coal reservoir fractures. We use different macrolithotype coal particles with size of 0.2-0.4 mm, a heat-shrinkable tube and two guide blocks to make a reconstituted coal sample. In order to investigate the behavior of reconstituted coal permeability changing with effective stress and the influence of lithotype effect on permeability of reconstituted coal, reconstituted coal cores porosity and permeability test with helium gas in net confining stress were measured in laboratory. And pore distribution of different macrolithotype natural coals and reconstituted coals were analyzed by low-temperature nitrogen adsorption experiment and low-field nuclear magnetic resonance (NMR) measurement. Both porosity and permeability of reconstituted coal decrease exponentially with the increase of effective stress. Initial permeability and permeability damage rate of reconstituted coal have a negative correlation and a positive correlation with quality proportion of clarain and vitrain, respectively. The proportion of seepage channels of dull reconstituted coal is larger than that of bright reconstituted coal. (C) 2017 Elsevier Ltd. All rights reserved.
机译:煤的渗透性已被确定为影响煤层气(CBM)提取的关键因素之一。煤层气排采和水力压裂通常导致煤粉的输出。这些煤细粉中的一些穿过煤层排出的井眼,并且其中的一些在密闭压力下闭合裂缝(或夹板)的过程中被压实在裂缝中。这些压实的煤粉的孔隙分布和渗流路径与天然煤不同。在这项研究中,我们使用再生煤作为研究材料来研究煤储层裂缝中压实煤粉的孔隙度和渗透率特征。我们使用尺寸为0.2-0.4 mm的不同巨石型煤颗粒,可热缩管和两个导向块来制作再生煤样品。为了研究再生煤渗透率随有效应力变化的行为,以及岩性效应对再生煤渗透性的影响,在实验室进行了净煤围压下再生煤芯孔隙率和氦气渗透性试验。并通过低温氮吸附实验和低场核磁共振(NMR)测量,分析了不同巨石型天然煤和再生煤的孔隙分布。再生煤的孔隙度和渗透率都随着有效应力的增加而呈指数下降。再生煤的初始渗透率和渗透率破坏率与clarain和vitrain的质量比分别呈负相关和正相关。钝态重整煤的渗流通道所占比例大于光亮重整煤的渗流通道所占比例。 (C)2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Fuel》 |2017年第15期|12-22|共11页
  • 作者单位

    China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China|Natl CBM Engn Ctr, Coal Reservoir Lab, Beijing 100083, Peoples R China;

    China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China|Natl CBM Engn Ctr, Coal Reservoir Lab, Beijing 100083, Peoples R China;

    China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China|Natl CBM Engn Ctr, Coal Reservoir Lab, Beijing 100083, Peoples R China;

    China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China|Natl CBM Engn Ctr, Coal Reservoir Lab, Beijing 100083, Peoples R China;

    China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China|Natl CBM Engn Ctr, Coal Reservoir Lab, Beijing 100083, Peoples R China;

    China United Coalbed Methane Natl Engn Res Ctr Co, Fundamental Expt Ctr, Beijing 100083, Peoples R China;

    China United Coalbed Methane Natl Engn Res Ctr Co, Fundamental Expt Ctr, Beijing 100083, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Permeability; Reconstituted coal; Anthracite coal; Lithotype; Effective stress;

    机译:渗透率复配煤无烟煤岩性有效应力;

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