Flow simulation of the mixture system of supercritical CO2 & superheated steam in toe-point injection horizontal wellbores

The results show that: (1). there exists a good agreement between predicted results and field data. The predicted temperature is higher when the heat exchange between IT and annuli is neglected. The predicted temperature is lower when the friction loss item is considered in the energy balance equation. (2). the temperature of the mixture increases when the mixture flows from toe-point to heel-point in annuli due to heat flow from IT to annuli. (3). While the absorption rate of the mixture in formation increases with increasing of the content of supercritical CO2, it can be offset by the decrease of temperature and enthalpy of the mixture. (4). Both of the mixture temperature and formation mixture absorption rate increase with increasing of injection pressure.