Table 1.

Composites of the water-based drilling fluids.

ID	Composite	Style
WD1	4 wt% bentonite + 0.3 wt% potassium peroxydisulfate (KPS)	Basic mud
WD2	4 wt% bentonite + 0.3 wt% KPS + 0.2 wt% low-viscosity polyanionic cellulose (Lv-PAC)
WD3	4 wt% bentonite + 0.3 wt% KPS + 0.5 wt% Lv-PAC
WD4	4 wt% bentonite + 0.3 wt% KPS + 1.0 wt% Lv-PAC
DW1	4 wt% NIPAM/bentonite + 0.3 wt% KPS	Modified mud
DW2	4 wt% NIPAM/bentonite + 0.3 wt% KPS + 0.2 wt% Lv-PAC
DW3	4 wt% NIPAM/bentonite + 0.3 wt% KPS + 0.5 wt% Lv-PAC
DW4	4 wt% NIPAM/bentonite + 0.3 wt% KPS + 1.0 wt% Lv-PAC