Page 188 - Reservoir Geomechanics

1.5
1.5
20 MPa
58.5 MPa
1.4
1.4
Normalized radial distance
Normalized radial distance
1.3
1.3
1.2
1.2
1.1
1.1
of strongly varies σ θθ that Note S Hmax . acting east–west an to subject R radius the in described are calculations the for used pressure pore and stress of Values at (i.e. wellbore the around compression horizontal maximum of point the at wall the 1.5, = At r/R (6.2). equation
well wall.
1 above azimuth
1 wellbore stress is
140 120 100 80 60 40 20 140 120 100 80 60 40 20
b. θθ s (MPa) c. θθ s (MPa) vertical wellbore the amplified far-field the at stress
a the from wall hoop
150 around
S Hmax σ θθ from r/R, strongly effective wellbore the 1.5,
100 stress, distance distance, is σ θθ the the =
s θθ (MPa) and wall, than from r/R
50 hoop normalized greater r/R, At zero.
effective 30% to
R wellbore wellbore well.
0 the with distance, close the
S hmin S hmin of around σ θθ the At is of
Variation of S hmin ). approximately normalized σ θθ absence
(a) position Variation of is wall, the
6.2. both azimuth stress with wellbore in
S Hmax Figure (b) σ θθ position
a. with text. the hoop of the