Basic aspects of rock mechanics
Borehole pressure required to reach tensile failure depends on:
- tensile strength of the rock;
- state of stress in the formation;
- orientation of the wellbore with respect to the state of stress;
- shape of the wellbore cross-section;
- wellbore fluid penetration into the rock;
- chemical interaction between the wellbore fluids and the rock.
1. State of stress - Definitions, conventions State of stress:
The state of stress is . . .