Abstract:

The produced wastewater from polymer flooding in Shengli Oilfield wastreated by the chemical coagulation method. The applicable coagulants were chosen and compounded based on the comparison of the single coagulation effect of each coagulant. The results showed that the oil or turbidity removal efficiencies of traditional aluminum salt or iron salt coagulants were much better than those of the inorganic polymer coagulants or organic polymer flocculants. When the aluminum chloride and iron chloride were compounded with the dosage mass ratio of 1:3,it could not only improve the settling performance and decrease the volume of sludge, but also obtained high oil and turbidity removal efficiencies. When the compounded aluminumiron coagulant was compounded with anionic polyacrylamide (APAM), the oil and turbidity removal efficiencies were dominated by the dosage of the inorganic compounded aluminumiron coagulant. And at the dosage of 0.5mg／L, APAM could bridge the flcos and improve the settling performance and decrease

the volume of sludge.

Key words: chemical coagulation method, compounded coagulant, produced wastewater from polymer flooding