Study on authigenic CO2 flooding technology and its effect

A study on authigenic CO2 flooding technology is carried out to solve the problem s of natural CO2 sources,transportation,corrosion,etc.in conventional CO2 flooding.This paper presents the authigenic CO2 flooding mechanis mand selects the authigenic CO2 flooding system based on taking reaction speed and economic factors into account. Evaluation is conducted on the effect of the selected CO2 system on expansion viscosity reduction in crude oil. The flooding mechanism and effect of the system is studied by using microscopic models and physical models.The experiment shows that dual hydraulic method is suitable to low temperature and single hydraulic method is suitable to high temperature.The expansion rate of the analog oil ranges from 10% to 32.5% in certain temperature and pressure based on using the authigenic CO2 flooding technology.It functions better as the density of oil increases.What’s more,this technology enables the crude viscosity to reduce by 38.1% to 57.2%.The recovery rate of the sand pack will increase by 6.4% to 15.5% after flooding.Experimental research and pilot tests show that the authigenic CO2 flooding technology perform s w ell and is of great potential for application.