Assessment of Chemical Effects on Wellbore Stability in Transition Shale Formation

Table 4

Direct shear testing results.

Sample	Shear area (mm^2)	Normal force (KN)	Normal stress (MPa)	Shear forces (KN)	Shear stress (MPa)
1	486.17	7.2	15	8.26	17
2	479.16	14.5	30	14.07	29.37
3	478.39	21.9	45	18.29	38.25