Assessment of Chemical Effects on Wellbore Stability in Transition Shale Formation

Figure 22

Damage zone around the wellbore (a) without considering the bedding planes and microcracks, (b) considering the bedding planes and microcracks without strength degradation and pore pressure change, (c) considering the bedding planes and microcracks with pore pressure change but no strength degradation, and (d) considering the bedding planes and microcracks with both strength degradation and pore pressure change.

(a)

(b)

(c)

(d)