HIGHLIGHTS
SUMMARY
The change in the formation pressure during the production or injection leads to a change in two important stresses (total and effective) which can cause different geomechanical troubles. Shear failure (break out) Means the collapse of the well wall due to insufficient drilling fluids that support the wall and thus makes the stresses around the wall exceed the pressure obtained through the drilling process. Tensile failure (break down) means that the pressure caused by drilling mud is much higher than the pore pressure or stress around the wellbore which can lead to formation fracture . . .
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