Optimization of rock failure criteria under different fault mechanisms and borehole trajectories

Tingting Wang, Yu Liu, Meng Cai, Wanchun Zhao, P. G. Ranjith, Ming Liu

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

During the drilling process, wellbore instability leads to a complex wellbore morphology. Thus, serious drilling accidents, such as leakage and sticking, can occur. Therefore, it is important to choose different failure criteria for different geological engineering conditions to calculate the safe density window of the drilling fluid to prevent borehole wall instability. In this study, the applicability of three different rock failure criteria, Mohr–Coulomb, Mogi–Coulomb, and Drucker–Prager, was examined under five different fault mechanisms, and the variation in borehole collapse pressure with the trajectory of the borehole under different fault mechanisms was investigated. The results provided a scientific basis for the selection of failure criteria under different geological engineering conditions. The relevant theory provides a reference for well trajectory design, well location selection, and drilling directions.

Original languageEnglish
Article number127
Number of pages14
JournalGeomechanics and Geophysics for Geo-Energy and Geo-Resources
Volume8
Issue number4
DOIs
Publication statusPublished - 12 Jul 2022

Keywords

  • Borehole collapse
  • Fault mechanism
  • Rock failure criterion
  • Wellbore instability

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