Preliminary numerical simulation of rock perforation cracking

LIN Yingsong; YAO Jinsong; LIU Ying; QIAO Jiyan; DING Yansheng

doi:10.11883/bzycj-2018-0122

Volume 39 Issue 7

Jul. 2019

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LIN Yingsong, YAO Jinsong, LIU Ying, QIAO Jiyan, DING Yansheng. Preliminary numerical simulation of rock perforation cracking[J]. Explosion And Shock Waves, 2019, 39(7): 075201. doi: 10.11883/bzycj-2018-0122

Citation:

LIN Yingsong, YAO Jinsong, LIU Ying, QIAO Jiyan, DING Yansheng. Preliminary numerical simulation of rock perforation cracking[J]. Explosion And Shock Waves, 2019, 39(7): 075201. doi: 10.11883/bzycj-2018-0122

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Preliminary numerical simulation of rock perforation cracking

doi: 10.11883/bzycj-2018-0122

1.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266555, Shandong, China
2.
Institute of Mechanics, Chinese Academy of Science, Beijing 100081, China

Received Date: 2018-04-12
Rev Recd Date: 2018-08-31
Publish Date: 2019-07-01

Abstract

Abstract

The distribution of cracks around the rock hole after perforation has a great influence on the subsequent fracturing. A cross-section of the target is selected as the researching object. The process of three-dimensional penetration is simplified into a two-dimensional reaming process. In terms of the mesoscopic heterogeneity of the rock, the strength parameters of meso-units are set to obey the Weibull probability distribution. The tensile failure criteria and the Mohr-Coulomb compression shear failure criteria are applied, and modulus reduction method is applied to deal with cracking. Then FEPG software is used to achieve a finite element method (FEM) simulation. The simulation results show that according to the causes and distribution of cracks, the perforated rock can be divided into four regions from the inside to the outside: compression shear damage zone, tensile damage concentration zone, tensile damage propagation zone and undamaged zone. The variations of crack distribution under different loading and confining pressure conditions are analyzed. Compared with the results of laboratory simulation experiments, the validity of the model is preliminarily verified. The research results lay the foundation for subsequent research work.
- perforation experiment,
- rock damage,
- fracture distribution,
- finite-element method simulation

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References(17)

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