Formation mechanism and main controlling factors of rock's initial damaged zone under explosive impact effect

Wu Feipeng; Liu Hongzhi; Ren Yang; Pu Chunsheng; He Yanlong; Jing Cheng

doi:10.11883/1001-1455(2016)05-0663-07

Volume 36 Issue 5

Oct. 2018

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Wu Feipeng, Liu Hongzhi, Ren Yang, Pu Chunsheng, He Yanlong, Jing Cheng. Formation mechanism and main controlling factors of rock's initial damaged zone under explosive impact effect[J]. Explosion And Shock Waves, 2016, 36(5): 663-669. doi: 10.11883/1001-1455(2016)05-0663-07

Citation:

Wu Feipeng, Liu Hongzhi, Ren Yang, Pu Chunsheng, He Yanlong, Jing Cheng. Formation mechanism and main controlling factors of rock's initial damaged zone under explosive impact effect[J]. Explosion And Shock Waves, 2016, 36(5): 663-669. doi: 10.11883/1001-1455(2016)05-0663-07

Citation:

Wu Feipeng, Liu Hongzhi, Ren Yang, Pu Chunsheng, He Yanlong, Jing Cheng. Formation mechanism and main controlling factors of rock's initial damaged zone under explosive impact effect[J]. Explosion And Shock Waves, 2016, 36(5): 663-669. doi: 10.11883/1001-1455(2016)05-0663-07

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Formation mechanism and main controlling factors of rock's initial damaged zone under explosive impact effect

doi: 10.11883/1001-1455(2016)05-0663-07

1.
College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
2.
Research Institute of CNOOC Shenzhen, Shenzhen 518000, Guangdong, China

Received Date: 2015-01-27
Rev Recd Date: 2015-06-25
Publish Date: 2016-09-25

Abstract

Abstract

In this work, to find out the formation mechanism of rock's initial damaged zone under explosive impact effect and investigate the main factors contributing to the initial damaged zone (including the crushed zone and the initial fractured zone) around the oil well, we analyzed the impact failure mode of rock and its response to loading rates by conducting impact failure experiments at different loading rates on two rock samples. With the help of the computational model of the crushed and initial fractured zone based on Von Mise, it is feasible to determine the the size of the crushed zone and the initial fractured zone according to the stress distribution generated by the peak pressure, when the rock crushes at a given loading rate (less than 190 GPa/s). The crushed zone and and the fractured zone are generated mainly in parts of the rock close to the oil well where explosive fractures occur. The diameter of the crushed zone and that of the initial fractured zone is 1~3 and 5~7 times that of the oil-well, respectively. The initial damaged zone is in direct proportion to the brittleness and the loading rate under loading impact and is more strongly influenced by the index of brittleness. The present work deepens the current understanding of the damage mode and main contributing factors of explosive fracture and provides guidance for the design of impact condition involving explosive fracture.
- mechanics of explosion,
- brittleness,
- loading rate,
- explosive fracture,
- initial damaged zone,
- impact

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References(18)

References

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