Page 269 - Reservoir Geomechanics

250 Reservoir geomechanics

80
25 MPa
BREAKOUTS 20 MPa
75 75 MPa

72 MPa
70

65 TENSILE
FRACTURES
S Hmax

60

55
S v

50

53.2 MPa
45

45 50 55 60 65 70 75 80
S hmin

S = 55.1 SliFric = 0.6 Azi = 280 IntFric = 1 Delta T = −26
v
P = 42.9 PoisRat = 0.2 Dev = 36 w = 45 Alpha = 2.4e − 0.6
p
BO
P = 49 S hmin = 53.2 aziSH = 100 YoungMod = 1.9e + 04
m
Figure 8.10. Analysis similar to Figure 7.10 to constrain the magnitude of S Hmax for the tensile
fractures observed in the deviated well shown in Figure 8.9. The heavy black line indicates the
magnitude of S Hmax as a function of S hmin to cause drilling-induced tensile fractures in a well with
the appropriate deviation, ECD and amount of cooling. Modified from Wiprut, Zoback et al.
(2000). Reprinted with permission of Elsevier.

Note that for a measured value of S hmin of 53.2 MPa that is appropriate for the depth
of interest, an S Hmax value of 72–75 MPa is indicated (other parameters used in the
modeling are discussed by Wiprut, Zoback et al. 2000). This value was incorporated
in the compilation of S Hmax magnitudes compiled for the Visund field (mostly from
vertical wells) presented in Figure 7.13.