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

Table 6

Comparison of three kinds of oil based properties of low fluorescence lubricant.

Properties	Methods and technical indicators	Low fluorescence lubricant
		E167	S-WD	T-YS
Lubricity	Δ𝐾𝑓 (%)	77.55	75.51	77.55
	Δ𝑓 (%)	76.82	77.02	68.07
Fluorescence performance	𝐹max	7.08	10.50	10.98
	Corresponding of 𝐹max EX (nm)	258	274	376
	Corresponding of 𝐹max EM (nm)	332	325	444
Foaming rate (%)	Mud + 1% X-E167, at room temperature	5.0	8.3	10.0
	Mud + 1% X-E167, after thermal ageing 120°C × 16 h	6.7	13.0	31.7
	Mud + 1% X-E167, after thermal ageing 150°C × 16 h	43.3	48.0	45.0