$Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs$
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Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

Abstract Fracture propagation mechanisms in coalbed methane (CBM) reservoirs are very complex due to the development of the internal cleat system. In this paper, the characteristics of initiation and propagation of hydraulic fractures in coal specimens at different angles between the face cleat and...

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Autores principales:	Chi Ai, Xiao-Xuan Li, Jun Zhang, Dan Jia, Wen-Jing Tan
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Coalbed methane reservoir Butt cleat Propagation mechanisms Fracture morphology Step-like fractures Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/7d6155cf46354e1dab73720a596c8c0e
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spelling	oai:doaj.org-article:7d6155cf46354e1dab73720a596c8c0e2021-12-02T07:07:00ZExperimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs10.1007/s12182-018-0252-z1672-51071995-8226https://doaj.org/article/7d6155cf46354e1dab73720a596c8c0e2018-07-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0252-zhttps://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Fracture propagation mechanisms in coalbed methane (CBM) reservoirs are very complex due to the development of the internal cleat system. In this paper, the characteristics of initiation and propagation of hydraulic fractures in coal specimens at different angles between the face cleat and the maximum horizontal principal stress were investigated with hydraulic fracturing tests. The results indicate that the interactions between the hydraulic fractures and the cleat system have a major effect on fracture networks. “Step-like” fractures were formed in most experiments due to the existence of discontinuous butt cleats. The hydraulic fractures were more likely to divert or propagate along the butt cleat with an increase in the angles and a decrease in the horizontal principal stress difference. An increase in the injection rate and a decrease in the fracturing fluid viscosity were more conducive to fracture networks. In addition, the influence on fracture propagation of the residual coal fines in the wellbore was also studied. The existence of coal fines was an obstacle in fracturing, and no effective connection can be formed between fractures. The experimental investigation revealed the fracture propagation mechanisms and can provide guidance for hydraulic fracturing design of CBM reservoirs.Chi AiXiao-Xuan LiJun ZhangDan JiaWen-Jing TanKeAi Communications Co., Ltd.articleCoalbed methane reservoirButt cleatPropagation mechanismsFracture morphologyStep-like fracturesScienceQPetrologyQE420-499ENPetroleum Science, Vol 15, Iss 4, Pp 815-829 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Coalbed methane reservoir Butt cleat Propagation mechanisms Fracture morphology Step-like fractures Science Q Petrology QE420-499
spellingShingle	Coalbed methane reservoir Butt cleat Propagation mechanisms Fracture morphology Step-like fractures Science Q Petrology QE420-499 Chi Ai Xiao-Xuan Li Jun Zhang Dan Jia Wen-Jing Tan Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
description	Abstract Fracture propagation mechanisms in coalbed methane (CBM) reservoirs are very complex due to the development of the internal cleat system. In this paper, the characteristics of initiation and propagation of hydraulic fractures in coal specimens at different angles between the face cleat and the maximum horizontal principal stress were investigated with hydraulic fracturing tests. The results indicate that the interactions between the hydraulic fractures and the cleat system have a major effect on fracture networks. “Step-like” fractures were formed in most experiments due to the existence of discontinuous butt cleats. The hydraulic fractures were more likely to divert or propagate along the butt cleat with an increase in the angles and a decrease in the horizontal principal stress difference. An increase in the injection rate and a decrease in the fracturing fluid viscosity were more conducive to fracture networks. In addition, the influence on fracture propagation of the residual coal fines in the wellbore was also studied. The existence of coal fines was an obstacle in fracturing, and no effective connection can be formed between fractures. The experimental investigation revealed the fracture propagation mechanisms and can provide guidance for hydraulic fracturing design of CBM reservoirs.
format	article
author	Chi Ai Xiao-Xuan Li Jun Zhang Dan Jia Wen-Jing Tan
author_facet	Chi Ai Xiao-Xuan Li Jun Zhang Dan Jia Wen-Jing Tan
author_sort	Chi Ai
title	Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
title_short	Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
title_full	Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
title_fullStr	Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
title_full_unstemmed	Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
title_sort	experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/7d6155cf46354e1dab73720a596c8c0e
work_keys_str_mv	AT chiai experimentalinvestigationofpropagationmechanismsandfracturemorphologyforcoalbedmethanereservoirs AT xiaoxuanli experimentalinvestigationofpropagationmechanismsandfracturemorphologyforcoalbedmethanereservoirs AT junzhang experimentalinvestigationofpropagationmechanismsandfracturemorphologyforcoalbedmethanereservoirs AT danjia experimentalinvestigationofpropagationmechanismsandfracturemorphologyforcoalbedmethanereservoirs AT wenjingtan experimentalinvestigationofpropagationmechanismsandfracturemorphologyforcoalbedmethanereservoirs
_version_	1718399580188442624

Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

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