Thermal eects on wellbore stress - John T. Foster · 2018-12-10 · ANALYSIS 300 400 3000 4000 5000...
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Thermal e×ects on wellbore stress Strongly time dependent strongly depenendent of the silica content of the rock. Under steady-state conditions,
Transcript of Thermal eects on wellbore stress - John T. Foster · 2018-12-10 · ANALYSIS 300 400 3000 4000 5000...
Thermal e�ects on wellbore stress
Strongly time dependent
strongly depenendent of the silica content of the rock.
Under steady-state conditions,
Time-temperature e�ects
© Cambridge University Press (Fig. 6.14a,b pp. 194)Zoback, Reservoir Geomechanics
Stability through cooling?
Cooling Reference
© Cambridge University Press (Fig. 6.14c pp. 194 and Fig. 6.3pp. 173)
Zoback, Reservoir Geomechanics
Rock strength anisotropy
© Cambridge University Press (Fig. 4.12, pp. 106)Zoback, Reservoir Geomechanics
Rock strength anisotropy e�ects onbreakouts
© Cambridge University Press (Fig. 6.16a,b pp. 199)Zoback, Reservoir Geomechanics
Two mechanisms
Stresses exceed intact rock strengthStresses activate slip on weak bedding planes
© Cambridge University Press (Fig. 6.16c pp. 199)Zoback, Reservoir Geomechanics
Chemical e�ectsWater Activity ( ) can to increased pore pressure
from breakout data
Example
© Cambridge University Press (Fig. 7.7 pp. 223)Zoback, Reservoir Geomechanics
Wellbore stability
De�ning a "stable" wellbore
© Cambridge University Press (Fig. 10.1a,b pp. 304)Zoback, Reservoir Geomechanics
Emperical model: Maximum 90breakouts
© Cambridge University Press (Fig. 10.2a,b pp. 305)Zoback, Reservoir Geomechanics
Comprehensive model
Design based on pore pressure and frac gradient
Model considering collapse pressure Final design
© Cambridge University Press (Fig. 10.3a,b,c pp. 307)Zoback, Reservoir Geomechanics
