Mechanical Stability of Horizontal Wellbore Implementing Mogi-Coulomb Law

Adel M. Al-Ajmi

Abstract


In this paper, a linear elastic constitutive model is described. The model consists of a three dimensional analyses of stress concentration around an arbitrarily oriented borehole, due to anisotropic in situ stress combined with internal wellbore pressure. Studying the principal stresses around a borehole require the consideration of three possible permutations for the principal stresses: (1) σz ≥ σq  ≥ σr, (2) σq  ≥ σz ≥ sr, and (3) σq  ≥ σr ≥ σz. Considering the practical field conditions, in normal faulting stress regime and reverse faulting stress regime, wellbore stability analysis can be simplified by only assuming case 2 (σθ  ≥ σz ≥ σr) for the principal stresses around horizontal borehole. In strike-slip stress regime, however, all the three possible permutations for the principal stresses should be considered in wellbore stability analysis. The constitutive model in conjunction with Mogi-Coulomb law has been used to introduce a new wellbore stability model for horizontal boreholes. The developed model has improved wellbore stability analysis compared to adopting the classical Mohr-Coulomb criterion that is commonly applied. This has been verified by several typical field case studies.

Key words: Wellbore stability; Borehole failure; Collapse pressure; Mogi-coulomb criterion; Horizontal drilling


Keywords


Wellbore stability; Borehole failure; Collapse pressure; Mogi-coulomb criterion; Horizontal drilling

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References


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DOI: http://dx.doi.org/10.3968/j.aped.1925543820120402.843

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