Research and application of weak gel profile control flooding technology in heavy oil reservoirs of 32-6 oilfield in Qinhuangdao

After long-term high strength injection-production development in 32-6 loose sandstone thick oilfield,the injection water channeling is serious and the water drive effect is gradually worse because of the strong heterogeneity of the reservoir and the big water-oil mobility ratio.According to the actual demand o oilfield development,the physical simulation experiment method is used to carry out the laboratory study and scheme optimization of polymer weak gel flooding technology.The larger the swept volume of water flooding is,the more remarkable the effect of water flooding recovery is.In the process of field implementation,the adjustment and flooding scheme of‘front slug+main slug+protection slug’was designed step by step The polymer concentrations were 2 000 mg/L,3 600 mg/L and 4 200 mg/L,poly:Cr~(3+)quality is 180∶1,and the injection slug was 0.08 PV.The increased oil production of pilot test in D10 well group was 2.4×10~4 m~3the water cut decreased by 6%,which obtain an obvious oil increasing effect and economic benefit.