Evaluation of shale fracture toughness based on micrometer indentation test

Evaluation of shale fracture toughness based on micrometer indentation test

It is an important mechanical parameter for fracture toughness that affects hydraulic fracturing. Some methods such as indoor test core and logging data interpretation are commonly used to obtain fracture toughness. These methods, however, have their own limitations. Liu's method has focused th...

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Main Authors: Xue Su, Ping Chen, Tianshou Ma
Format: Article
Language:English
Published: KeAi Communications Co., Ltd. 2019-03-01
Series:Petroleum
Online Access:http://www.sciencedirect.com/science/article/pii/S2405656117302377
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spelling doaj-7d6a44d9210743798dc566b498a324862021-02-02T05:06:33ZengKeAi Communications Co., Ltd.Petroleum2405-65612019-03-01515257Evaluation of shale fracture toughness based on micrometer indentation testXue Su0Ping Chen1Tianshou Ma2Corresponding author.; State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, ChinaIt is an important mechanical parameter for fracture toughness that affects hydraulic fracturing. Some methods such as indoor test core and logging data interpretation are commonly used to obtain fracture toughness. These methods, however, have their own limitations. Liu's method has focused the mechanical properties of shale including fracture toughness based on micro-/nano-indentation experiments. Zeng's method has pointed that the former method of calculating fracture toughness ignores the maximum holding stage in the indentation-displacement curves, they point out and correct the fracture stress intensity factor model, but the final calculation of the fracture toughness of the numerical difference is of two orders of magnitude. In this paper, micro-indentation experiments were carried out to further analyze and correct the model by collecting and analyzing Longmaxi shale cuttings. After Zeng and Liu's methods are combined, the irreversible elastic energy by energy area actually was measured. To some extent, the difference between the two kinds of fracture toughness is reduced. Keywords: Fracture toughness, Micro-indentation experiment, Rock mechanical propertieshttp://www.sciencedirect.com/science/article/pii/S2405656117302377
collection DOAJ
language English
format Article
sources DOAJ
author Xue Su
Ping Chen
Tianshou Ma
spellingShingle Xue Su
Ping Chen
Tianshou Ma
Evaluation of shale fracture toughness based on micrometer indentation test
Petroleum
author_facet Xue Su
Ping Chen
Tianshou Ma
author_sort Xue Su
title Evaluation of shale fracture toughness based on micrometer indentation test
title_short Evaluation of shale fracture toughness based on micrometer indentation test
title_full Evaluation of shale fracture toughness based on micrometer indentation test
title_fullStr Evaluation of shale fracture toughness based on micrometer indentation test
title_full_unstemmed Evaluation of shale fracture toughness based on micrometer indentation test
title_sort evaluation of shale fracture toughness based on micrometer indentation test
publisher KeAi Communications Co., Ltd.
series Petroleum
issn 2405-6561
publishDate 2019-03-01
description It is an important mechanical parameter for fracture toughness that affects hydraulic fracturing. Some methods such as indoor test core and logging data interpretation are commonly used to obtain fracture toughness. These methods, however, have their own limitations. Liu's method has focused the mechanical properties of shale including fracture toughness based on micro-/nano-indentation experiments. Zeng's method has pointed that the former method of calculating fracture toughness ignores the maximum holding stage in the indentation-displacement curves, they point out and correct the fracture stress intensity factor model, but the final calculation of the fracture toughness of the numerical difference is of two orders of magnitude. In this paper, micro-indentation experiments were carried out to further analyze and correct the model by collecting and analyzing Longmaxi shale cuttings. After Zeng and Liu's methods are combined, the irreversible elastic energy by energy area actually was measured. To some extent, the difference between the two kinds of fracture toughness is reduced. Keywords: Fracture toughness, Micro-indentation experiment, Rock mechanical properties
url http://www.sciencedirect.com/science/article/pii/S2405656117302377
work_keys_str_mv AT xuesu evaluationofshalefracturetoughnessbasedonmicrometerindentationtest
AT pingchen evaluationofshalefracturetoughnessbasedonmicrometerindentationtest
AT tianshouma evaluationofshalefracturetoughnessbasedonmicrometerindentationtest
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