We explore the extension of streamline simulation (SL) to thermal recovery processes. For each global time step of the thermal streamline simulator, we first compute the pressure field on an Eulerian grid. We then solve for the advective parts of the mass balance and energy equations along individual streamlines. At the end of each global time step, we account for the nonadvective terms of the mass balance and energy equations on the Eulerian grid along with gravity. We included temperature dependent viscosity and account for thermal expansion. We tested the thermal streamline simulator on two-dimensional heterogeneous quarter five spot problems and compared the results with those computed by a commercial thermal simulator on both accuracy and efficiency. Sensitivity studies for compressibility, gravity and thermal conduction effects are presented. The thermal streamline simulator is capable of producing accurate results at a computational cost that is much lower than that of existing Eulerian simulators.

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