Wellbore Stability in Oil and Gas Drilling with Chemical-Mechanical Coupling

Table 1

Clay mineral contents and water diffusion coefficient of shale.

Core no.	Clay mineral total contents (%)	Clay mineral relative contents (%)				𝐷eff
		Smectite	Illite	Kaolinite	Chlorite	(cm^2/h)
1-1#	21.68	45	19	17	19	0.0238
1-2#	29.28	51	24	13	12	0.0247
1-3#	26.68	32	20	26	22	0.0184