Table 4.

Composition of the WBDFs.

Component	Function	Mass Fraction/wt%
bentonite	filtrate reducer and viscosifier	4
low-viscosity filter loss reducer	filtrate reducer and viscosifier	1
rheology modifier	viscosifier	0.25
hydrophobic inhibitor	shale inhibitor	2
CaCO3	plugging agent	2
FT	plugging agent	2
lubricants	Lubricants	2
NaCl	hydrate inhibitor	20

Note: drilling fluid systems were weighted to 1.5 g/cm³ by barite.