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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第8期    总第240期    2014年8月

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文章编号:1672-7207(2014)08-2871-07
甲烷在页岩上吸附的热力学
杨峰,宁正福,王庆,刘慧卿,孔德涛

(中国石油大学(北京) 石油工程教育部重点实验室,北京,102249)

摘 要: 为了研究页岩吸附甲烷的机理,通过容积法测定35,50和65 ℃时页岩甲烷吸附等温线,计算甲烷在页岩上的等量吸附热和极限吸附热,从热力学角度分析甲烷在页岩上的吸附行为。研究结果表明:甲烷在页岩上的吸附等温线具有Ⅰ型等温线特征,Langmuir吸附模型较好地拟合了吸附数据;根据吸附等温线计算的等量吸附热为15.50~17.65 kJ/mol,平均为16.88 kJ/mol,说明页岩对甲烷的吸附为物理吸附;等量吸附热随甲烷吸附量的变化而变化,是页岩表面的不均匀性和吸附分子间作用力综合作用的结果;极限吸附热定量地反映了页岩表面与甲烷气体作用力;在页岩气藏开发时,除了采用降压解吸开采外,对于极限吸附热较大的页岩气藏,可通过注入吸附能力更强的CO2等促使甲烷解吸。

 

关键词: 页岩;吸附等温线;热力学;等量吸附热;极限吸附热

Thermodynamic analysis of methane adsorption on gas shale
YANG Feng, NING Zhengfu, WANG Qing, LIU Huiqing, KONG Detao

Ministry of Education Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

Abstract:In order to investigate the mechanism of methane adsorption on shales, black shale samples were performed for adsorption experiments, and adsorption isotherms of methane on shales at 35, 50 and 65 ℃ were measured. The isosteric heat and limit isosteric heat of methane adsorption on shale were also calculated to study the thermodynamics behavior. The results show that adsorption isotherms of methane in shale are typeⅠisotherms, and Langmuir adsorption model fits the adsorption data well. The isosteric adsorption heat calculated from the adsorption isotherms is from 15.50 to 17.65 kJ/mol with an average of 16.88 kJ/mol, which indicates that the dominant adsorption performance may be physical adsorption. The isosteric heat of methane adsorption on shale changes with the increase of volume adsorbed, which is caused by the combination of energetically heterogeneous surface and intermolecular forces of methane. The limit isosteric heat reflects quantitatively the intermolecular forces between methane and shale. During the development of shale gas reservoir, CO2 with higher adsorption capacity can be injected into the high limit isosteric heat reservoir to enhance methane recovery.

 

Key words: shales; adsorption isotherm; thermodynamics; isosteric heat; limit isosteric heat

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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