Abstract:

In the course of thermal heavy oil recovery,calculating on-way parameters and evaluating bottom hole parameters through injection wellbore are generally based on the ordinary steam.However,as overheated steam is single-phase gas,heat loss calculation model for ordinary wet steam is not applicable.On the basis of conservation of mass,conservation of momentum,conservation of energy,with the introduction of the PVT data sets,the new on-way parameter calculation model through injection wellbore is set up.On-way overheated steam parameters under various conditions are obtained by programming.As the results showed,as the well depth increases,the temperature and the pressure of overheated steam varies greatly,the increase of injection temperature does not obviously impact the on-way heat loss.

Key words: overheated steam, heavy oil, wellbore, on-way parameter, calculation model