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Table 5 Results of the analytical approach for the computation of the breakdown pressure (Pfrac)

From: Borehole damaging under thermo-mechanical loading in the RN-15/IDDP-2 deep well: towards validation of numerical modeling using logging images

Name Tectonics Principal stresses P frac, UTS=15 MPa
σA* (MPa) σB* (MPa)
Case A Intermediary normal/strike-slip fault (σv = σH = σ1) 76 134 110
Case B Normal fault—“low” horizontal isotropic stress (σv = σ1) 60 79 116
Case C Strike-slip fault (σH = σ1 and σv = σ2) 76 178 65
Case D Normal fault—“high” horizontal isotropic stress (σv = σ1) 80 94 161
  1. Following Eq. 14 in Appendix with \(\Delta T = 0\) and UTS = 15 MPa. Principal stresses in the cross section perpendicular to the wellbore axis are obtained by diagonalization of the stress state (σss, σdd, τsd) mentioned in Table 1 and are thus slightly different from horizontal principal stresses