Effect of Nitric Acid on the Low Fluorescing Performance of Drilling Fluid Lubricant Based Animal and Vegetable Oils

Table 2

Rheology variation of fresh water mud before and after adding E167.

Experimental condition	Content of E167 (%)	AV (mPa·s)	PV (mPa·s)	YP (Pa)	FLAPI (mL)
Room temperature	0	10.5	6	4.3	19.2
	0.5	11.5	6	5.7	18.4
	1.0	12.5	6	6.2	16.8
150°C × 16 h	0	17.0	8	9.1	26.0
	0.5	17.7	8	9.8	24.0
	1.0	18.0	8	10.1	24.0
180°C × 16 h	0	18.0	7	5.1	24.0
	0.5	19.0	8	10.5	26.0
	1.0	17.3	8	7.4	24.0