沁水盆地典型煤矿区煤的流速敏感性实验及控制机理

采用沁水盆地3个典型煤矿中、高煤阶煤样,开展了实验室煤样流速敏感性实验,分析了不同流速条件下煤样渗透率的变化规律,建立了煤储层渗透性与流速之间的关系和模型,揭示了中、高煤阶煤储层流速敏感性的控制机理。研究结果表明,煤样渗透率随流速发生变化,且存在一个临界流速。在临界流速之前随着注入流量（或流速）的增加煤样渗透率增加,当流速超过临界流速后,煤样的渗透率随着流体流速的增加反而减少。煤储层流速敏感性主要受控于煤储层物性和煤中速敏矿物。随着煤储层孔隙度、渗透率和流体流量的增高,煤储层速敏损害率按对数函数关系增高。实验煤样黏土矿物占矿物质含量为66.63%～99.89%,主要以高岭石、伊利石为主,存在潜...

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Bibliographic Details
Published in煤炭学报 Vol. 42; no. 10; pp. 2649 - 2656
Main Author 孟召平;侯安琪;张鹏;郝海金;武杰
Format Journal Article
LanguageChinese
Published 山西晋城无烟煤矿业集团有限责任公司煤与煤层气共采国家重点实验室,山西晋城048000%中国矿业大学(北京)地球科学与测绘工程学院,北京,100083%山西晋城无烟煤矿业集团有限责任公司煤与煤层气共采国家重点实验室,山西晋城,048000 2017
中国矿业大学(北京)地球科学与测绘工程学院,北京100083
Subjects
控制机理
沁水盆地
流速敏感性
煤储层
control mechanism
coal reservoir
控制机理
flow rate sensitivity
流速敏感性
沁水盆地
Qinshui Basin
煤储层
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ISSN0253-9993
DOI10.13225/j.cnki.jccs.2017.0893

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Summary:采用沁水盆地3个典型煤矿中、高煤阶煤样,开展了实验室煤样流速敏感性实验,分析了不同流速条件下煤样渗透率的变化规律,建立了煤储层渗透性与流速之间的关系和模型,揭示了中、高煤阶煤储层流速敏感性的控制机理。研究结果表明,煤样渗透率随流速发生变化,且存在一个临界流速。在临界流速之前随着注入流量（或流速）的增加煤样渗透率增加,当流速超过临界流速后,煤样的渗透率随着流体流速的增加反而减少。煤储层流速敏感性主要受控于煤储层物性和煤中速敏矿物。随着煤储层孔隙度、渗透率和流体流量的增高,煤储层速敏损害率按对数函数关系增高。实验煤样黏土矿物占矿物质含量为66.63%～99.89%,主要以高岭石、伊利石为主,存在潜在的速敏伤害,速敏实验结果表明,本区实验煤样存在不同程度的速敏损害,煤样速敏损害程度由弱至中等偏强,临界流速低。随着煤中黏土矿物含量的增加,煤储层速敏损害率也增高。在煤层气井排采过程中,寺河煤矿和西山煤矿煤层气井排采降速应为赵庄煤矿的6倍左右。
Bibliography:MENG Zhaoping1,2, HOU Anqi1, ZHANG Peng1 , HAO Haijin2, WU Jie2 （ 1. College of Geosciences and Surveying Engineering, China University of Mining and Technology （Beijing） , Beijing 100083, China ; 2. State Key Laboratory of Coal and CBM Co-mining, Shanxi Jincheng Anthracite Mining Group Company ,Ltd. , Jincheng 048000, China）
By using medium and high rank coal samples from three typical coal mines in Qinshui Basin,an experimental study on flow rate sensitivity has been carried out. The permeability variation under different flow conditions is analyzed and the relationship models between coal reservoir permeability and flow rate are established. Furthermore,the control mechanisms of flow rate sensitivity about medium and high-rank coals are revealed. It is shown that the coal sample permeability varies with the flow rate,and there is a critical flow velocity. Before the critical flow rate,with the increase of injection flow rate（ or velocity）,the permeability of coal sample increases. When the velocity exceeds
ISSN:0253-9993
DOI:10.13225/j.cnki.jccs.2017.0893