Qiang 1 Block Light Oil Reservoir Air Injection Displacement Feasibility Study

In recent years,low permeability reservoirs in Liaohe oil field have the poor development results.Liaohe oil field badly needs transformation of the mode of development,because water flooding development of low permeability reservoir is difficult to establish an effective displacement system.The air displacement is an effective technology to improve the development effect of low permeability reservoirs.And air displacement has advantages of low cost and high oil displacement efficiency.In this paper,feasibility study of air displacement of light oil reservoir has been conducted.Light oil reservoir low-temperature oxidation air injection technology is improved the recovery method though the heating effect and the approximate reaction of flue gas flooding.And oxygen in the air and oil consume oxygen oxidizing reaction after high pressure air injection.Based on the research at home and abroad literature this paper summarizes the research status of recovery mechanism of light oil reservoir air flooding.Light oil reservoir air injection displacement indoor experiment has been conducted,including sand filling tube model experiment and a slender tube model experiment.Experiment results analyzed the influence of different gas injection pressure,reservoir temperature and the of different gas injection rate on the recovery.Low temperature oxidation mathematical model and Air displacement model based on geological characteristics of Qiang 1 area has been made.The numerical simulation study on the development and geological factors has been conducted.Developing factors include spacing,gas injection rate and injection pressure.Geologic factors include poor permeability,stratigraphic dip and reservoir temperature.Injected gas composition with reduced the oxygen concentration,Formed oxygen reduction air displacement development way to evaluate oxygen air flooding development effect.Researches show that,when injection of 0.19 PV,gas breakthrough,before the gas breakthrough reservoir can form high oil saturation of oil wall.The development of air displacement effect is best.When distance is 400 m,gas injection rate is 200 t/d,the injection pressure is 16 MPa,permeability differential is 40,the formation dip Angle is 10 °,reservoir temperature is 85 ?.Air injection effect is much better than that of water flooding development in Qing 1 Block.Development plan projections for air displacement,the production index results show that the blocks in the air drive huge potential for development.