Real-Time Pore Pressure Detection: Indicators and Improved Methods

Figure 10

Angular or splintered cavings caused by shear failures: a case of lower mud weight than the shear failure gradient. (a) Borehole breakout from shear failure in a laboratory test [25]; (b) triaxial compressive core test creating angular rock pieces; (c) angular/splintered cavings from a subsalt borehole.

(a)

(b)

(c)