Page 189 - Reservoir Geomechanics

at the At
the (i.e. Variation that
strongly in wellbore 1.5, = (c) wellbore. at

varies described the At r/R well. the present

σ θθ are (6.2). the around be
that around of would
Note calculations equation absence compression that
S Hmax . the for compression with the in σ hmin

acting used position horizontal stress
1.5 1.5 horizontal accordance
20 MPa 58.5 MPa pressure that far-field

1.4 1.4 east–west maximum in S hmin at minimum effective
Normalized radial distance Normalized radial distance subject of S Hmax be point the
1.3 1.3 an to pore and and present of

1.2 1.2 R stress of point the of would the than
radius at values that S Hmax , greater
1.1 1.1 Values of
of wall the σ Hmax slightly
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