Super-amphiphobic, strong self-cleaning and high-efficiency water-based drilling fluids

JIANG Guancheng,NI Xiaoxiao,LI Wuquan,QUAN Xiaohu,LUO Xuwu

Table 7 Contents of heavy metals in the super-amphiphobic, strong self-cleaning and high-efficiency water-based drilling fluid.

Heavy metal Content/ (mg?kg-1) Maximum allowable value /(mg?kg-1) Cadmium 0 20 Mercury 2.41×10-3 15 Lead 17.2 1 000 Totle Chromium 14.3 1 000 Arsenic 0.62 75