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A fracture conductivity model for channel fracturing and its implementation with Discrete Element Method
Zhu HY; Shen JD; Zhang FS
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
2019
Volume172Pages:149-161
ISSN0920-4105
AbstractThis paper introduces a new method to predict conductivity in channel fracturing by implementing analytical solution in Discrete Element Method (DEM). First, an analytical model for channel fracturing conductivity is proposed. Then, a DEM model calibrated by using experimental results is set up to investigate the deformation of proppant pillar. Finally, the analytical model of fracture conductivity is implemented in the DEM model to predict conductivity during fracture closing. Parametric analyses are carried out to understand the effects of four factors: proppant size combination, concentration, time ratio tau and elastic modulus to stress ratio lambda. Conductivity generally decreases during fracture closing and increases with the increasing proppant size and proppant concentration. The ratio of the pulsing time of proppant laden fluid to the pulsing time of the clean fluid is the key parameter for the field operation. A large time ratio could enhance the pillar stability though it may lead to the damage of fracture conductivity. For given rock modulus, closing stress and proppant size, the optimal range of time ratio can be given as a guidance for field operation. The field application of channel fracturing in the Shengli Oilfield proves that the optimized range of time ratio tau based on the proposed theoretical model is valid. The porosity of proppant pillar first decreases due to compression and then increases during fracture closing period because of the breakdown of the proppant pillar and the resulted particle movement outward. This paper gives insights for understanding the channel fracture conductivity and provides a practical tool for the optimization of channel fracturing design in the field.
KeywordChannel fracturing Proppant pillar Fracture conductivity Optimization Discrete element method
DOI10.1016/j.petrol.2018.09.054
Indexed BySCI ; EI
Language英语
WOS IDWOS:000447888300014
WOS KeywordMECHANICAL STABILITY ; PROPPANT EMBEDMENT ; SIMULATION
WOS Research AreaEnergy & Fuels ; Engineering, Petroleum
WOS SubjectEnergy & Fuels ; Engineering
Funding OrganizationNational Key Basic Research Program of China (973 Program) [2014CB239205] ; National Natural Science Foundation of China [51604232, 41772286] ; China Postdoctoral Science Foundation [2017M610117]
Classification一类
Ranking1
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/78472
Collection非线性力学国家重点实验室
Affiliation1.{Zhu, Haiyan、Shen, Jiadong} Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China
2.{Zhu, Haiyan} Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
3.{Zhang, Fengshou} Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China
4.{Zhang, Fengshou} Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China
Recommended Citation
GB/T 7714
Zhu HY,Shen JD,Zhang FS. A fracture conductivity model for channel fracturing and its implementation with Discrete Element Method[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2019,172:149-161.
APA Zhu HY,Shen JD,&Zhang FS.(2019).A fracture conductivity model for channel fracturing and its implementation with Discrete Element Method.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,172,149-161.
MLA Zhu HY,et al."A fracture conductivity model for channel fracturing and its implementation with Discrete Element Method".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 172(2019):149-161.
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