Study on Changqing Oilfield Reinjection Water Quality Standards

At present,the main injected water of Changqing oilfield is the treated oily wastewater.The sus- pended solids and emulsified oil in injected water are important factors causing reservoir damage.As the main water flooding block,Jingan Chang 6and Jurassic Y9are the main object of study.Through indoor physical sim- ulation experiments combined with the existing technical level and treatment cost,the paper puts forward the water quality standards for Jingan Chang 6and Jurassic Y9:the suspended solids content shall be less than 5mg ·L-1,10mg·L-1,emulsified oil content shall be less than 10mg·L-1,30mg·L-1,respectively.