An analytical model for fracture initiation in elasto-plastic soft formations based on stress path analysis
文献类型:期刊论文
作者 | Wu, Shiguo2,3; Sun, Jin2; Deng, Jingen1 |
刊名 | JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING |
出版日期 | 2019-05-01 |
卷号 | 176期号:1页码:906-925 |
ISSN号 | 0920-4105 |
关键词 | Fracture Initiation Pressure Soft Formations Fracturing Mode Stress Path Tensile Fracturing Shear Fracturing |
DOI | 10.1016/j.petrol.2019.01.064 |
英文摘要 | Most 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. |
WOS关键词 | Consolidated Rock Strata ; Numerical-simulation ; Borehole Yield ; Wellbore ; Propagation ; Stability |
资助项目 | Innovative 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研究方向 | Energy & Fuels ; Engineering |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000460395200077 |
资助机构 | Innovative 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 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/6680] |
专题 | 深海科学研究部_深海地球物理与资源研究室 |
通讯作者 | Sun, Jin |
作者单位 | 1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China 2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China |
推荐引用方式 GB/T 7714 | Wu, Shiguo,Sun, Jin,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(1):906-925. |
APA | Wu, Shiguo,Sun, Jin,&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(1),906-925. |
MLA | Wu, Shiguo,et al."An analytical model for fracture initiation in elasto-plastic soft formations based on stress path analysis".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 176.1(2019):906-925. |
入库方式: OAI收割
来源:深海科学与工程研究所
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