Patent ID: 9703904
Date: 2017-07-11
CPC Classifications: F24T,G06F,Y02E

Claim:
1. A method of modeling an annular circulation co-production system, the method comprising: identifying flow streams, depending upon flow and thermal conditions, the flow streams comprising at least: modeling heat transfer to the second production fluid stream from the wellbore and formation below the downhole heat exchanger section, and optionally through a lower casing, using a first equation; modeling heat transfer to the working fluid delivery stream from the formation through the upper casing using a second equation; modeling heat transfer to the working fluid return stream from the first production fluid using a third equation; modeling heat transfer to the working fluid return stream from the working fluid delivery stream using a fourth equation, the first, second, third, and fourth equations forming a coupled system of equations; and performing an energy balance for the system by solving the coupled system of equations numerically, providing heat transfer rates to determine the pressure, temperature and quality profile in the working fluid streams.