• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
低阶煤不同宏观煤岩组分润湿性及影响因素研究
  • Title

    Study on wettability and influencing factors of different macroscopiccomponents in low rank coal

  • 作者

    陈跃马东民夏玉成郭晨杨甫邵凯

  • Author

    CHEN Yue,MA Dongmin,XIA Yucheng1,GUO Chen,YANG Fu,SHAO Kai

  • 单位

    西安科技大学 地质与环境学院国土资源部 煤炭资源勘查与综合利用重点实验室西安科技大学 地质资源与地质工程博士后科研流动站陕西省煤层气开发利用有限公司

  • Organization
    1.College of Geology and Environment, Xi′an University of Science and Technology, Xi′an ,China; 2. Key Laboratory of CoalResources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi′an, China;3.Post-doctoral ResearchStation of Geological Resources and Geological Engineering, Xi′an University of Science and Technology, Xi′an , China; 4.Shaanxi Coalbed Methane Development Co.,Ltd., Xi′an ,China
  • 摘要

    随着我国低阶煤煤层气勘探开发的深入,低含气量、低储层压力、高含水性等问题逐渐凸显。为研究低阶煤不同宏观煤岩组分润湿性差异及影响因素,以黄陇煤田大佛寺煤矿4号煤为研究对象,采集全层煤样、镜煤样和暗煤样,通过测定接触角,对比分析润湿性差异并详细探讨工业组分、化学结构、孔隙特征等因素对润湿性的影响。结果表明:大佛寺煤矿4号煤的接触角为45.8°~60.4°,均小于90°,表现出较强的亲水性,镜煤的接触角大于暗煤,暗煤的润湿性更好,并且润湿性与层理方向有关,润湿性由高到低依次为:垂直层理方向、斜交层理方向、平行层理方向。表面活性剂6501可以有效增强煤的润湿性,其对镜煤的改性作用大于暗煤,并且对平行层理方向改性作用大于垂直层理方向。煤的物质组成和孔隙结构对其润湿性具有显著影响。无机矿物(灰分)具有亲水性,灰分越高,煤的润湿性越好,而挥发分通常具疏水性,挥发分越高,煤的润湿性越差。相对于暗煤,镜煤的灰分更低,挥发分更高,因而润湿性更差。H元素含量高,润湿性变差,C、O元素对润湿性的影响较为复杂,主要取决于含氧官能团的类型,暗煤含有更多的羟基和羧基等极性含氧官能团,而镜煤则含醚氧基和酯键较多,故暗煤的润湿性更好。相较于暗煤,镜煤的孔隙以半封闭孔为主,连通性差、分选差、孔径小、比表面积大、表面更粗糙,使得润湿性更差。


  • Abstract
    With the deepening of the exploration and development of low rank coalbed methane in China, problems such as low gas content, low reservoir pressure and high water content have become increasingly prominent. In order to study the difference in wettability of different macro-coal components in low-rank coal and its influencing factors, this paper takes the No.4 coal mine of Dafosi Coal Mine in Huanghua coalfield as the research object, and collects the whole-layer coal sample, mirror coal sample and dark coal sample, and measures the contact. The differences in wettability were analyzed by angle comparison and the effects of industrial composition, chemical structure and pore characteristics on wettability were discussed in detail. The contact angle of No.4 coal in Dafosi Coal Mine is 45.8° to 60.4°, both of which are less than 90°, showing strong hydrophilicity. The contact angle of mirror coal is larger than that of dark coal, and the wettability of dark coal is better. The properties are related to the direction of the bedding.The order of wettability from high to low is: vertical bedding direction, oblique bedding direction, parallel bedding direction. Surfactant 6501 can effectively enhance the wettability of coal. Its modification effect on mirror coal is greater than that of dark coal, and the modification effect on parallel bedding direction is greater than that in vertical bedding direction. Both the material composition and pore structure of coal have a significant effect on its wettability. Inorganic minerals (ash) are hydrophilic: the higher the ash content is, the better the wettability of coal will be. And the volatiles are usually hydrophobic, the higher the volatiles are, the worse the wettability of coal will be. Compared with durain, vitrinite has lower ash content and higher volatile content, resulting in its worse wettability. The higher content of H element is, the poorer wettability will be, and the effect of C and O elements on wettability depends on the type of oxygen containing functional groups. Durain contains more polar oxygen containing functional groups such as hydroxyl and carboxyl, favorable for wettability, whereas vitrain contains more nonpolar oxygen ether and ester bond. Compared with dark coal, the pores of mirror coal are mainly semi-closed pores, with poor connectivity, poor sorting, small pore size, large specific surface area and rough surface, which makes the wettability worse.
  • 关键词

    低阶煤煤岩组分润湿性孔隙结构煤层气

  • KeyWords

    low rank coal; coal lithotype; wettability; pore structure;coalbed methane

  • 基金项目(Foundation)
    陕西省自然科学基础研究计划资助项目(2019JQ-245);国土资源部煤炭资源勘查与综合利用重点实验室开放课题资助项目(KF2019-2,ZKF2018-1);陕西省煤层气开发利用有限公司重大科研专项资助项目(2018SMHKJ-B-J-47)
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