Impact of Near-Wellbore Stress in Wellbore Integrity Analysis: Wellbore Fracture Strengthening Approach

  • Frank Chinedu Ukaeru
  • Kevin Igwilo
  • Anthony Chikwe
  • Obibuike Ubanozie
Keywords: Wellbore, Fracture, Drilling, Drilling fluid, Formation, Model


The analysis of borehole stability during drilling is particularly important in the oil and gas industry. Loss of borehole stability during drilling often increases drilling costs, reduces drilling efficiency and even causes the bottom hole to collapse. Regardless of the drilling method used (for example, under-balanced or overbalanced), if borehole is constant throughout the drilling process, drilling integrity problems are unlikely to occur during oil and gas production. The design and implementation of drilling operation is the subject of most research and is a priority for most drilling projects, so it is important to understand the factors that affect borehole stability during drilling. In this study, an analytical model is developed for the purpose of performing quantitative research on the subject of wellbore fortification. The model is appropriate for use with wellbore walls that have small fractures. The development of this model is grounded in the theory of linear elastic fracture mechanics, which functions as the basis for this foundation. The small fracture model does not take into consideration the pressure gradient that exists within the fracture because of the short length of the small fracture. Nevertheless, this model does take into consideration the effect that near-wellbore stress concentration has on the strengthening of the wellbore. The model is validated by comparison to a more basic fracture model that already exists in the research literature.


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How to Cite
Ukaeru, F. C., Igwilo, K., Chikwe, A., & Ubanozie, O. (2024). Impact of Near-Wellbore Stress in Wellbore Integrity Analysis: Wellbore Fracture Strengthening Approach. European Journal of Science, Innovation and Technology, 4(1), 187-206. Retrieved from