Analytical Study of In-situ Combustion in a Wet Porous Medium

There is a renewed interest in using combustion for the recovery of medium viscosity oil. In-situ<br>combustion is commonly divided into zones according to the main processes occurring inside.<br>In the downstream order they are combustion, coke, cracking, steam and light hydro-carbon zones. In this<br>analytical study the cracking reaction and the light hydro-carbon vaporization process are neglected for<br>simplicity. We take into account the reaction occurring between the residual petroleum coke and the<br>oxygen contained in the injected air. We also assume the presence of small amount of immobile liquid<br>phase, which can vaporize; this feature is useful if this study is applied to gasefication of coal<br>containing water.