| 摘要 |
In one aspect, the present invention provides a subsurface heater comprising: a combustible gas supply conduit; an oxygen supply conduit and a heat transmissive external housing encompassing the porous refractory medium. The combustible gas supply conduit and the oxygen supply conduit are configured as a concentric pair disposed within a porous refractory medium and coupled to a plurality of gas jets disposed within the porous refractory medium. The porous refractory medium having disposed within it a plurality of combustion product gas return conduits. The combustion product gas return conduits are configured to receive combustion product gases from the porous refractory medium. Also provided in another aspect of the present invention, is a method for heating a subsurface zone.
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