Abstract: Toxicand harmful chemical components in waste drilling fluids may cause severe environmental pollution and physical injuries.To reduce the quantity of such toxic materials and to minimize concentrations of these materials,preliminary solid/liquid separation,deep solid/liquid separation and chemical processing techniques were combined to establish integral solid/liquid separation-chemistry processing technology.Field application results obtained in 5 wells of Changbei Gas Field showed that upon processing of waste drilling fluids by using the innovative separation technology,sewage contents,cuttings,mud cake leachates and all other indexes could meet the requirements specified in relevant emission standards.The processed waste fluids could be discharged or reused as required,and the cost was lower than the conventional solidification-purification technologies.Research results showed the proposed integral solid/liquid separation-chemistry processing technology could effectively process waste drilling fluids.