Numerical Simulation of Borehole Stability in Underbalanced Drilling Coal Seam

Authors

Yumei Li, 1.Beijing Key Laboratory of High Dynamic Navigation Technology, University of Beijing Information Science & Technology, Beijing 100101, China; ;
Su Zhong, 1.Beijing Key Laboratory of High Dynamic Navigation Technology, University of Beijing Information Science & Technology, Beijing 100101, China; ;
Zhang Tao, 1.Beijing Key Laboratory of High Dynamic Navigation Technology, University of Beijing Information Science & Technology, Beijing 100101, China; ;
Delong Zhang, 3. PetroChina Xinjiang Petroleum Engineering Construction Co., Ltd. Karamay 834000, China; ;
Liwei Yu, 3. PetroChina Xinjiang Petroleum Engineering Construction Co., Ltd. Karamay 834000, China; ;
Si Na, 4. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China;

Abstract

Abstract: According to the formation parameters of No.3 coal seam in the Qinshui Basin, Shanxi Province, considering the interaction between seepage and deformation in the borehole wall of coal seam, using the finite element method for establishing the stable elastoplastic numerical model of the borehole in coal seam,the variation of pore pressure near the wellbore wall with the seepage time and the effect of time delay on wellbore stability under underbalanced drilling condition were studied. The variation law of maximum displacement and maximum plastic deformation around borehole wall with bottom pressure were analyzed. The simulation results show that there is indeed a time delay effect on wellbore stability and the plastic analysis of coal and rock under consideration of seepage and deformation coupling conditions is more reasonable and effective, and it provides sufficient time conditions for guiding drilling construction.

Recommended Citation

Li, Yumei; Zhong, Su; Tao, Zhang; Zhang, Delong; Yu, Liwei; and Na, Si (2019) "Numerical Simulation of Borehole Stability in Underbalanced Drilling Coal Seam," Journal of System Simulation: Vol. 30: Iss. 11, Article 25.
DOI: 10.16182/j.issn1004731x.joss.201811025
Available at: https://dc-china-simulation.researchcommons.org/journal/vol30/iss11/25

First Page

4249

Revised Date

2018-08-29

DOI Link

https://doi.org/10.16182/j.issn1004731x.joss.201811025

Last Page

4255

CLC

TE31

Recommended Citation

Li Yumei, Su Zhong, Zhang Tao, Zhang Delong, Yu Liwei, Si Na. Numerical Simulation of Borehole Stability in Underbalanced Drilling Coal Seam[J]. Journal of System Simulation, 2018, 30(11): 4249-4255.

DOI

10.16182/j.issn1004731x.joss.201811025