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6.1 The wellbore environment
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Introduction to Energy Geomechanics
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5.7 Further reading and
Contents
6
. Wellbore Stability
Subsections
6
.
1
The wellbore environment
6
.
2
Kirsch solution for stresses around a cylindrical cavity
6
.
2
.
1
Cylindrical coordinate system
6
.
2
.
2
Kirsch solution components
6
.
2
.
3
Complete Kirsch solution
6
.
3
Shear failure and wellbore breakouts
6
.
3
.
1
Breakout angle determination
6
.
3
.
2
Breakout measurement
6
.
3
.
3
Maximum horizontal stress determination from breakout angle
6
.
4
Tensile fractures and wellbore breakdown
6
.
4
.
1
Identification of tensile fractures in wellbores
6
.
5
The mud window
6
.
6
Mechanical stability of deviated wellbores
6
.
6
.
1
Wellbore orientation
6
.
6
.
2
Calculation of stresses on deviated wellbores
6
.
6
.
3
Breakout analysis for deviated wellbores
6
.
6
.
4
Tensile fractures analysis for deviated wellbores
6
.
7
Thermal, chemical, and leak-off effects on wellbore stability
6
.
7
.
1
Thermal effects
6
.
7
.
2
Chemo-electrical effects
6
.
7
.
3
Leak-off effects
6
.
8
Strength anisotropy
6
.
9
Problems
6
.
10
Further reading and references
