Formation mechanism of core discing during drilling under deep in-situ stress environment: Numerical simulation and laboratory testing

• Published in: Journal of Central South University Vol. 30; no. 10; pp. 3303 - 3321
• Main Authors: Li, Fei, Gao, Ming-zhong, Ye, Si-qi, Xie, Jing, Deng, Hu-chao, Yang, Ben-gao, Liu, Jun-jun, Yang, Zun-dong, Tang, Rui-feng
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.10.2023; Springer Nature B.V
• Subjects: Axial stress; Coring; Drilling; Energy conversion; Energy distribution; Engineering; Fractal geometry; Fracture surfaces; Laboratory tests; Metallic Materials; Sandstone; crack distribution; deep rock mass; 断面形貌; 深部岩体; 裂纹分布; discing formation mechanism; 能量演化; 原位应力; 宏观破裂特征; fracture surface morphology; in-situ stress; macroscopic failure characteristics; 饼化形成机制; energy evolution

Core discing often occurs during drilling under deep in-situ stress environment. To determine its formation mechanism in sandstone under deep in-situ stress environment, PFC2D was used to study the crack distribution and energy evolution during drilling under different in-situ stress, and specific i...