Adsorption deformation characteristics of coal and coupling with permeability during gas injection

被引：16

作者：

Liu, Xiaolei ^{[1
,2
,3
]}

Wu, Caifang ^{[4
]}

Wei, Guoying ^{[1
,2
,3
]}

Zhang, Xiaodong ^{[5
,6
]}

Jia, Tianrang ^{[1
,2
,3
]}

Li, Huaizhen ^{[1
,2
,3
]}

Du, Mingyang ^{[4
]}

机构：

[1] Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454000, Henan, Peoples R China

[2] Henan Polytech Univ, Coll Safety Sci & Engn, Jiaozuo 454000, Henan, Peoples R China

[3] State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454000, Henan, Peoples R China

[4] Minist Educ, Key Lab Coalbed Methane Resource & Reservoir Form, Room 338,South Jiefang Rd, Xuzhou 221008, Jiangsu, Peoples R China

[5] Henan Polytech Univ, Sch Energy Sci & Engn, Jiaozuo 454000, Henan, Peoples R China

[6] Collaborat Innovat Ctr Coalbed Methane Shale Gas, Jiaozuo 454000, Henan, Peoples R China

来源：

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING | 2020年 / 195卷

基金：

中国国家自然科学基金;

关键词：

CBM; Injection pressure; Adsorption strain; Permeability; Free adsorption boundary; BITUMINOUS COAL; SORPTION; SHRINKAGE; METHANE; CO2; DESORPTION; EVOLUTION; POROSITY; STRAIN; IMPACT;

D O I：

10.1016/j.petrol.2020.107875

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The study of coal adsorption-induced strain is of great significance to the development of coalbed methane (CBM). In this text, the relationship between adsorption-induced strain and injection time, injection pressure, flux and permeability were studied by He and N-2 injection respectively. The variation of adsorption strain with time at different stages was mainly studied. It was found that the strain increases linearly with increasing injection pressure within the experimental range. The relationship between strain and time is according to Langmuir's law under the same injection pressure. Meanwhile, there is a free adsorption boundary in the initial linear stage of adsorption. Within the free adsorption boundary, the adsorption-induced strain rate is independent of pore pressure; afterwards the adsorption-induced strain rate begins to be dominated by pore pressure. Moreover, the permeability increases with the increase of pore pressure. Because of the negative effect of adsorption expansion, the variation of N-2 permeability with injection pressure is slower than that of He. The lower the initial permeability is, the more serious the permeability damage caused by adsorption expansion will be. The final research results show that pore pressure has a dual effect of "one positive and one negative". The positive effect is the promotion of gas migration, and the negative effect is the inhibition of adsorption expansion on gas migration.

引用

页数：10

共 35 条

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