Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring

Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring

Abstract Tortuous hydraulic fractures (HFs) are likely to be created in heterogeneous formations such as conglomerates, which may cause sand plugging, ultimately resulting in poor stimulation efficiency. This study aims to explore HF growth behavior in conglomerate through laboratory fracturing expe...

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Autores principales: Nai-Zhen Liu, Yu-Shi Zou, Xin-Fang Ma, Ning Li, Shan Wu
Formato: article
Lenguaje:EN
Publicado: KeAi Communications Co., Ltd. 2018
Materias:
Conglomerate
Gravel
Hydraulic fracturing
Propagation mechanism
Computed tomography (CT)
Acoustic emission (AE)
Science
Q
Petrology
QE420-499
Acceso en línea:https://doaj.org/article/8443e869db404d4d942601b714ea0575
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spelling oai:doaj.org-article:8443e869db404d4d942601b714ea05752021-12-02T07:53:36ZStudy of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring10.1007/s12182-018-0290-61672-51071995-8226https://doaj.org/article/8443e869db404d4d942601b714ea05752018-12-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0290-6https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Tortuous hydraulic fractures (HFs) are likely to be created in heterogeneous formations such as conglomerates, which may cause sand plugging, ultimately resulting in poor stimulation efficiency. This study aims to explore HF growth behavior in conglomerate through laboratory fracturing experiments under true tri-axial stresses combined with computed tomography scanning and acoustic emission (AE) monitoring. The effects of gravel size, horizontal differential stress, and AE focal mechanisms were examined. Especially, the injection pressure and the AE response features during HF initiation and propagation in conglomerate were analyzed. Simple HFs with narrow microfractures are created in conglomerate when the gravels are considerably smaller than the specimen, whereas complex fractures are created when the gravels are similar in size to the specimen, even under high horizontal differential stresses. Breakdown pressure and AE rates are high when a HF is initiated from the high-strength gravel. A large pressure decline after the breakdown may indicate the creation of a planar and wide HF. Analyzing the focal mechanism indicates that the shear mechanism generally dominates with an increase in the HF complexity. Tensile events are likely to occur during HF initiation and are located around the wellbore. Shear events occur mainly around the nonplanar and complex matrix/gravel interfaces.Nai-Zhen LiuYu-Shi ZouXin-Fang MaNing LiShan WuKeAi Communications Co., Ltd.articleConglomerateGravelHydraulic fracturingPropagation mechanismComputed tomography (CT)Acoustic emission (AE)ScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 2, Pp 396-408 (2018)
institution DOAJ
collection DOAJ
language EN
topic Conglomerate
Gravel
Hydraulic fracturing
Propagation mechanism
Computed tomography (CT)
Acoustic emission (AE)
Science
Q
Petrology
QE420-499
spellingShingle Conglomerate
Gravel
Hydraulic fracturing
Propagation mechanism
Computed tomography (CT)
Acoustic emission (AE)
Science
Q
Petrology
QE420-499
Nai-Zhen Liu
Yu-Shi Zou
Xin-Fang Ma
Ning Li
Shan Wu
Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring
description Abstract Tortuous hydraulic fractures (HFs) are likely to be created in heterogeneous formations such as conglomerates, which may cause sand plugging, ultimately resulting in poor stimulation efficiency. This study aims to explore HF growth behavior in conglomerate through laboratory fracturing experiments under true tri-axial stresses combined with computed tomography scanning and acoustic emission (AE) monitoring. The effects of gravel size, horizontal differential stress, and AE focal mechanisms were examined. Especially, the injection pressure and the AE response features during HF initiation and propagation in conglomerate were analyzed. Simple HFs with narrow microfractures are created in conglomerate when the gravels are considerably smaller than the specimen, whereas complex fractures are created when the gravels are similar in size to the specimen, even under high horizontal differential stresses. Breakdown pressure and AE rates are high when a HF is initiated from the high-strength gravel. A large pressure decline after the breakdown may indicate the creation of a planar and wide HF. Analyzing the focal mechanism indicates that the shear mechanism generally dominates with an increase in the HF complexity. Tensile events are likely to occur during HF initiation and are located around the wellbore. Shear events occur mainly around the nonplanar and complex matrix/gravel interfaces.
format article
author Nai-Zhen Liu
Yu-Shi Zou
Xin-Fang Ma
Ning Li
Shan Wu
author_facet Nai-Zhen Liu
Yu-Shi Zou
Xin-Fang Ma
Ning Li
Shan Wu
author_sort Nai-Zhen Liu
title Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring
title_short Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring
title_full Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring
title_fullStr Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring
title_full_unstemmed Study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using CT scanning and acoustic emission monitoring
title_sort study of hydraulic fracture growth behavior in heterogeneous tight sandstone formations using ct scanning and acoustic emission monitoring
publisher KeAi Communications Co., Ltd.
publishDate 2018
url https://doaj.org/article/8443e869db404d4d942601b714ea0575
work_keys_str_mv AT naizhenliu studyofhydraulicfracturegrowthbehaviorinheterogeneoustightsandstoneformationsusingctscanningandacousticemissionmonitoring
AT yushizou studyofhydraulicfracturegrowthbehaviorinheterogeneoustightsandstoneformationsusingctscanningandacousticemissionmonitoring
AT xinfangma studyofhydraulicfracturegrowthbehaviorinheterogeneoustightsandstoneformationsusingctscanningandacousticemissionmonitoring
AT ningli studyofhydraulicfracturegrowthbehaviorinheterogeneoustightsandstoneformationsusingctscanningandacousticemissionmonitoring
AT shanwu studyofhydraulicfracturegrowthbehaviorinheterogeneoustightsandstoneformationsusingctscanningandacousticemissionmonitoring
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