To deal with the problems of high viscosity,poor flow behavior,and difficult extraction of crude oil in Bohai Oilfield's ultra heavy oil field,the viscosity reducing and oil displacement performance of high-temperature viscosity reducing agents was studied.High temperature viscosity reducer can maintain good viscosity reduction performance in formation water with a salinity degree of 30 000 mg/L and a calcium/magnesium ion concentration of 2 000 mg/L,with a viscosity reduction efficiency greater than 98％.The viscosity reducing oil displacement system can improve the oil displacement efficiency by 28％and has good temperature resistance.When the liquid solid ratio is 10∶1(mL∶g),the static adsorption of the viscosity reducer system on the rock reaches equilibrium,with a saturated adsorption capacity of 0.6 mg/g sand and an adsorption equilibrium time of 15 h.Reducing viscosity agents can also change the surface wettability of oil sands,thereby improving oil recovery efficiency.
viscosity reducerhigh temperature displacementinterfacial tensionwettability
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