A novel model for wellbore stability analysis during reservoir depletion

Pouria Behnoud far, Amir Hossein Hassani*, Adel M. Al-Ajmi, Hossein Heydari

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


It is not common to build a geomechanical model for depleted reservoirs as logging and coring are costly and time consuming in such reservoirs. On the other hand, in regular analysis of wellbore stability, the effect of time is completely ignored. As a result, with time there will be some errors in the evaluation of wellbore stability in depleted reservoirs. In order to determine the optimum wellbore trajectory during the reservoir life, it is necessary to have a model which can estimate the rock properties based on the first full logging suite and also consider the depletion effect. In this study, a novel model is proposed which combines a mechanical earth model, borehole circumferential stresses, Mogi-Coulomb failure criteria and simulation of pore pressure variation near wellbore to determine the optimum well trajectory during drilling and production in a condensate offshore reservoir. As a main output from the application of the new model, it was found that the most stable wellbore trajectory changed after 18–27 years of production. This critical output from this study raises the need to consider the possibility of changing the designed well trajectory over the life of the reservoir to maintain wellbore stability and optimize the drilling and production operations.

Original languageEnglish
Pages (from-to)935-943
Number of pages9
JournalJournal of Natural Gas Science and Engineering
Issue numberPart A
Publication statusPublished - Sept 1 2016


  • Circumferential stresses
  • Depletion
  • Linear elasticity
  • Mechanical earth model
  • Optimum well trajectory
  • Production time

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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