in situ carbon dioxide dissolving into the liquid hydrocarbon lowering its viscosity recovering the reservoir liquid hydrocarbons of lowered viscosity using the substantially horizontal production well and optionally conveying the recovered liquid hydrocarbons to the surface where the process is absent a removal step of any non condensable gas from the reservoir application_number US 201615157948 A description sagdox is an improved thermal enhanced oil recovery eor process for bitumen recovery the process can use geometry similar to sagd fig3 but it also has versions with separate vertical wells or segregated sites for oxygen injection and or non condensable vent gas removal fig2 29 30 and 32 the process can be considered as a hybrid sagd isc process one objective of sagdox is to reduce reservoir energy injection costs while maintaining good efficiency and productivity oxygen combustion produces in situ heat at a rate of about 480 btu scf oxygen independent of fuel combusted fig3 butler 1991 combustion temperatures are independent of pressure and they are higher than saturated steam temperatures fig3 the higher temperature from combustion vaporizes connate water and refluxes some steam steam delivers eor energy from latent heat released by condensation with a net value including surface heat recovery of about.