Synthesis and Performance Evaluation of a New Deoiling Agent for Treatment of Waste Oil-Based Drilling Fluids

Table 2

Main pollutants in waste oil-based drilling fluid.

Sample source	Cr (mg/kg)	Pb (mg/kg)	As (mg/kg)	Hg (mg/kg)	Cd (mg/kg)	Oil (mg/kg)
Unused oil-based drilling fluid (Daqing Oilfield)	18.50	14.74	14.30	1.239	0.14	267000
Waste oil-based drilling fluid (number 501, W.S., Daqing Oilfield)	10.70	21.20	20.38	0.754	0.35	309000
Displacing mud (number 501, W.S., Daqing Oilfield)	21.30	11.50	15.73	1.213	0.17	396000
Waste oil-based drilling fluid (number11, X., Daqing Oilfield)	13.60	30.70	17.92	0.836	0.41	292000
Displacing mud (number 11, X., Daqing Oilfield)	9.80	16.40	10.30	0.727	0.35	365000
Control standards for pollutants in sledges from agricultural (GB4284-84)	≤1000	≤1000	≤75	≤15	≤20	≤3000