Study on Chemical Enhanced Hot Water Flooding in Artificial Water Flooding Heavy Oil Field
In artificial water drive heavy oil fields,the degree of recovery is not high,the wellbore temperature resistance is limited,and the effect of hot water injection is limited in the later stage.In order to discuss the efficiency mechanism and effect of hot water injection with chemical agent,based on the experimental data,the viscosity reduction mechanism of hot water was analyzed,and the synergistic mechanism of three agents A,B and C in reducing viscosity,reducing interfacial tension and improving mobility ratio was analyzed.The effects of cold,hot water and hot water composite chemicals were compared by numerical simulation.The results showed that,the viscosity of formation crude oil in LD oilfield decreased with the increase of temperature,when the temperature rose from 54℃to 108℃,the viscosity of crude oil decreased to 54 mPa·s,which greatly improved the flow difficulty of crude oil;The viscosity reduction rate of agent A was more than 90%at different temperatures,which had good viscosity reduction performance;The mass concentration of reagent B increased from 500 mg·L-1 to 3 000 mg·L-1,and the interfacial tension decreased from 0.015 mN·m-1 to 0.006 mN·m-1,and the performance of temperature resistance and interfacial tension reduction was good at 108℃;The viscosity of agent C solution reached 125 mPa·s at the reservoir temperature of 54℃,and the viscosity decreased by 33%when the temperature rose to 90℃,and the water-oil mobility ratio increased to 0.9 at 90℃,which was better for oil displacement;The composite efficiency enhancement scheme of hot water with additives A,B and C had the best effect.Compared with cold water flooding,the final oil recovery was increased by 12.4%,which could provide a new idea for improving oil recovery of such reservoirs.
Heavy oilHot water driveChemical synergismSynergistic mechanismNumerical simulation
万方数据
维普
