Numerical Simulation on Borehole Instability Based on Disturbance State Concept

Daobing Wang (), Zhan Qu, Zongxiao Ren, Qinglin Shan, Bo Yu, Yanjun Zhang and Wei Zhang
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Daobing Wang: The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas of Shaanxi Province, Xi’an Petroleum University, Xi’an 710065, China
Zhan Qu: The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas of Shaanxi Province, Xi’an Petroleum University, Xi’an 710065, China
Zongxiao Ren: The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas of Shaanxi Province, Xi’an Petroleum University, Xi’an 710065, China
Qinglin Shan: School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266510, China
Bo Yu: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Yanjun Zhang: The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas of Shaanxi Province, Xi’an Petroleum University, Xi’an 710065, China
Wei Zhang: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Energies, 2022, vol. 15, issue 17, 1-18

Abstract: This paper carries out a study on the numerical simulation of borehole instability based on the disturbance state concept. By introducing the disturbance damage factor into the classical Mohr–Coulomb yield criterio, we establish a finite element hydro-mechanical coupling model of borehole instability and program the relevant field variable by considering elastic–plastic deformation in borehole instability, the distribution of the damage disturbance area, the variation of porosity and permeability with the disturbance damage factor, etc. Numerical simulation shows that the borehole stability is related to the action time of drilling fluid on the wellbore, stress anisotropy, the internal friction angle of rock, and borehole pressure. A higher horizontal stress difference helps suppress shear instability, and a higher rock internal friction angle enhances shear failure around the borehole along the maximum horizontal principal stress. When considering the effect of the internal friction angle of rock, the rock permeability, disturbance damage factor, and equivalent plastic strain show fluctuation characteristics. Under the high internal friction angle of rock, a strong equivalent plastic strain area and disturbance damage area occur in the direction of the maximum horizontal principal stress. Their cloud picture shows the mantis shape, where the bifurcation corresponds to the whiskers of the shear failure area in borehole instability. This study provides a theoretical basis for solving the problem of borehole instability during drilling engineering.

Keywords: borehole stability; disturbance state concept; elastic–plastic deformation; finite element method; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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