煤基质收缩和膨胀对甲烷开采和二氧化碳存储的影响

周锋德, 姚光庆, 唐仲华

doi:10.11764/j.issn.1672-1926.2010.01.150

天然气地球科学 >

2010 , Vol. 21 >Issue 1: 150 - 156

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.01.150

煤层气

煤基质收缩和膨胀对甲烷开采和二氧化碳存储的影响

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(1.中国地质大学（武汉）构造与油气资源教育部重点实验室，湖北武汉 430074；
2.中国地质大学（武汉）资源学院，湖北武汉 430074；
3. 中国地质大学（武汉）环境学院，湖北武汉 430074)

周锋德（1976-），男，江西余干人，讲师，博士，主要从事油气储层表征、数值模拟和渗流机理等研究.

收稿日期: 2009-04-17

修回日期: 2009-07-01

网络出版日期: 2010-02-10

基金资助

中国地质大学（武汉）优秀青年教师资助计划项目（编号:CUGQNL0825）;国家自然科学基金项目（编号:10802079）联合资助

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Influence of Coal Matrix Shrinkage and Swelling on Coalbed Methane Production and CO₂ Storage

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1.Key Laboratory of Tectonics and Petroleum Resources（China University of Geosciences）, Ministry of Education,Wuhan 430074,China；2.Institute of Earth Resources,China University of Geosciences,Wuhan 430074,China; 3.Institute of Environment,China University of Geosciences,Wuhan 430074,China

Received date: 2009-04-17

Revised date: 2009-07-01

Online published: 2010-02-10

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摘要

应用耦合的煤层气数值模型，模拟和对比了3种不同的煤基质收缩和膨胀模型模拟的渗透率、CH₄产量、CH₄含量分布、CO₂注入量和CO₂存储量。在无CO₂注入情况下，考虑吸附/解吸附作用的煤基质收缩/膨胀模型最大的渗透率为初始渗透率的6倍，而只考虑压力作用的煤基质收缩/膨胀模型渗透率下降2%，CH₄累积产量前者是后者的1.3倍；在CO₂注入情况下，考虑吸附/解吸附作用的模型最大的渗透率为原来的1.25倍，最小为原来的0.17倍，而只考虑压力作用的煤基质收缩/膨胀模型渗透率下降1.6%，CH₄累积产量前者是后者的1.5倍，而CO₂的注入速度和存储量后者分别是前者的14倍和3.85倍。结果表明：煤基质收缩/膨胀对CH₄开采和CO₂都有影响，吸附/解吸附导致的基质收缩/膨胀起主要作用。

关键词： CH₄开采; CO₂存储; 基质收缩和膨胀; 数值模拟

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周锋德, 姚光庆, 唐仲华 . 煤基质收缩和膨胀对甲烷开采和二氧化碳存储的影响[J]. 天然气地球科学, 2010 , 21(1) : 150 -156 . DOI: 10.11764/j.issn.1672-1926.2010.01.150

Abstract

Using three different coalbed matrix shrinkage/swelling models,we comparatively simulated the permeability,methane production,methane content distribution,CO₂ injection and CO₂ storage.It is pointed that the simulated maximum permeability is 6 times of initial permeability of shrinkage/swelling model based on sorption/desorption,and permeability decrease with 2 per cent of initial permeability of shrinkage/swelling model based on pressure changes,and the cumulative methane production of former is 1.3 times of later,without CO₂ injection.The simulated maximum and minimum permeability is 1.25 and 0.17 times of initial permeability of shrinkage/swelling model based on sorption/desorption,and permeability decrease with 1.6 per cent of initial permeability of shrinkage/swelling model based on pressure changes,and the cumulative methane production of former is 1.5 times of later,and the CO₂ injection rate and cumulative CO₂ sequestration of later is 14 and 3.85 times of former,with CO₂ injection.The results indicate that both the methane production and CO₂ sequestration are affected by matrix shrinkage/swelling,and dominated by shrinkage/swelling model which based on sorption and desorption.

Key words： Methane production; CO₂ sequestration; Matrix shrinkage and swelling; Numerical simulation.

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