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An analytical model for fracture initiation in elasto-plastic soft formations based on stress path analysis
Sun, Jin1; Wu, Shiguo1,2; Deng, Jingen3
2019-05-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume176Pages:906-925
AbstractMost models developed for hydraulic fracturing initiation of borehole are based on the elasticity mechanics, and tensile fracturing is considered as the mechanism of fracture initiation. However, the lab and field data show that these models cannot properly predict the fracturing mechanism of soft formations. We proposed an elasto-plastic model to analyze the fracturing mode and fracture initiation pressure in the soft formations that considers the effect of overburden pressure and fluid flow. The analytical stress solutions under six different stress state are obtained, thus the effective stress path on the borehole wall is analyzed to determine the fracturing mode. The effective stress path analysis indicate that both tensile and shear fracturing are considered as the fracturing mode. The fracturing mode and fracture initiation pressure are influenced by the burial depth significantly. The tensile fracturing is more likely to occur in the shallow formation, while the shear fracturing usually occurs in the deep formation. In addition, the formation strength and mud cake also affect fracturing mode and fracture initiation pressure. The shear fracturing is more easily to be induced in the formation with low strength and tight mud cake. The preyielding around the borehole due to the low strength will decrease the fracture initiation pressure without affecting the fracturing mode of the borehole wall.
KeywordFracture initiation pressure Soft formations Fracturing mode Stress path Tensile fracturing Shear fracturing
DOI10.1016/j.petrol.2019.01.064
Funding OrganizationInnovative Research Team Program of Natural Science Foundation of Hainan Province ; National Program on Key Basic Research Project of China ; Laboratory for Marine Geology, Qingdao National Laboratory for Maine Science and Technology
Language英语
Funding ProjectInnovative Research Team Program of Natural Science Foundation of Hainan Province[2018CXTD346] ; National Program on Key Basic Research Project of China[2015CB251201] ; Laboratory for Marine Geology, Qingdao National Laboratory for Maine Science and Technology[MGQNLM-KF201717]
WOS KeywordCONSOLIDATED ROCK STRATA ; NUMERICAL-SIMULATION ; BOREHOLE YIELD ; WELLBORE ; PROPAGATION ; STABILITY
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000460395200077
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/6681
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorSun, Jin
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
First Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Corresponding Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
GB/T 7714
Sun, Jin,Wu, Shiguo,Deng, Jingen. An analytical model for fracture initiation in elasto-plastic soft formations based on stress path analysis[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2019,176:906-925.
APA Sun, Jin,Wu, Shiguo,&Deng, Jingen.(2019).An analytical model for fracture initiation in elasto-plastic soft formations based on stress path analysis.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,176,906-925.
MLA Sun, Jin,et al."An analytical model for fracture initiation in elasto-plastic soft formations based on stress path analysis".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 176(2019):906-925.
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