In view of the characteristics of tight oil reservoirs with low porosity and ultra-low permeability.Surfactants are screened through surface interfacial tension,wettability and stability tests,and an integrat-ed fracturing fluid with drag reduction and oil displacement is developed and tested for rheology,drag re-duction and oil washing properties of the fracturing fluid.The results show that the fracturing fluid has good temperature resistance and shear resistance at 120℃,the drag reduction rate is 70%,and the oil washing rate is 50%.Two wells F125-7 and F125P1 in the tight oil block of Jiangsu oilfield were applied in the field.From the field construction effect and the post-fracturing effect,the fracturing fluid met the re-quirements of online liquid distribution,drag reduction,oil displacement,sand carrying,etc.The daily oil production after fracturing was 4.4 t and 6.4 t respectively,and the oil increase effect was good.
关键词
致密油/减阻/驱油/压裂液
Key words
tight oil/drag reduction/displacement of oil/fracturing fluid
万方数据