Performance evaluation of in—situ generation of carbon dioxide under reservoir conditions

The technique of in-situ generation of carbon diox- ide is a new effective method to enhance oil recovery. Through experiments,this paper has made a performance evaluation on the capability of in-situ generation of car- bon dioxide,which includes expansion,viscosity reduc- tion,scale formation,injury and so on.The results indi- cate that the in-situ generation of carbon dioxide has good expansion efficiency,favorable viscosity reduction efficiency and great displacement efficiency.When the viscosity of oil is 12904.1 mPa·s,the temperature is 70℃,the pressure is 6 MPa.With this technique,oil volume can be expanded by 32.5%,the viscosity can be reduced by 52.69% and oil recovery can he enhanced by 6.4%-17.06%.Besides that,this technology has no harm to the formation.