Polymer Drilling Fluid with Micron-Grade Cenosphere for Deep Coal Seam

Table 3

Applicable formula and correlation coefficient of different drilling fluid rheological models under different temperatures.

Model	Temperature/°C	Regression equation	Correlation coefficient
Bingham	20		0.8865
	30		0.9016
	40		0.9213
	50		0.9144
Power law	20		0.9968
	30		0.9982
	40		0.9961
	50		0.9970