Table 2.

Rheological parameters τ₀, K, and n of drilling fluid contain different concentrations copolymer before and after aging treatment.

Sample	Temp (°C)	Water (mL)	Bent (g)	PADAD (g)	τ0 (Pa)	K (Pa·sn)	n	R2
A1	25	350	14	0	0.102	0.043	0.700	0.997
B1	25	350	14	0.7	2.810	0.309	0.627	0.994
C1	25	350	14	1.75	10.22	1.056	0.579	0.992
D1	25	350	14	3.5	29.63	4.630	0.439	0.951
E1	25	350	14	7.0	35.25	5.136	0.435	0.951
A2	160	350	14	0	1.86	0.133	0.766	0.994
B2	160	350	14	0.7	4.343	1.273	0.524	0.984
C2	160	350	14	1.75	5.876	1.411	0.565	0.987
D2	160	350	14	3.5	12.26	3.712	0.475	0.969
E2	160	350	14	7.0	14.30	3.905	0.493	0.974