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A method for producing hydrocarbons from a reservoir. The method includes positioning a burner having a combustion chamber in a first well, supplying a fuel, an oxidant, and one of water or steam from the surface to the burner in the first well, supplying a viscosity-reducing gas from the surface to

A method for producing hydrocarbons from a reservoir. The method includes positioning a burner having a combustion chamber in a first well, supplying a fuel, an oxidant, and one of water or steam from the surface to the burner in the first well, supplying a viscosity-reducing gas from the surface to the reservoir in a conduit separate from the fuel, igniting the fuel and the oxidant in the combustion chamber to generate heat and steam in the burner, injecting the viscosity-reducing gas and steam into the reservoir to reduce the viscosity of and heat hydrocarbons within the reservoir, and recovering hydrocarbons from the reservoir.

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1. A method for producing hydrocarbons from a reservoir, comprising: positioning a burner having a combustion chamber in a first well;supplying a fuel, an oxidant, and one of water or steam from the surface to the burner in the first well;supplying a viscosity-reducing gas from the surface to the re

1. A method for producing hydrocarbons from a reservoir, comprising: positioning a burner having a combustion chamber in a first well;supplying a fuel, an oxidant, and one of water or steam from the surface to the burner in the first well;supplying a viscosity-reducing gas from the surface to the reservoir in a conduit separate from the fuel;igniting the fuel and the oxidant in the combustion chamber to generate heat and steam in the burner;injecting the viscosity-reducing gas and steam into the reservoir to reduce the viscosity of and heat hydrocarbons within the reservoir; andrecovering hydrocarbons from the reservoir. 2. The method of claim 1, wherein the hydrocarbons are recovered from the reservoir through the first well or through a second well that is spaced from or intersects the first well. 3. The method of claim 2, wherein at least one of the first and second wells comprise at least one horizontal, vertical, and slanted well section. 4. The method of claim 2, wherein the viscosity-reducing gas injected into the reservoir drives the hydrocarbons to the first or second well. 5. The method of claim 1, wherein the conduit for supplying the viscosity-reducing gas to the reservoir comprises an annulus of the first well. 6. The method of claim 1, wherein the viscosity-reducing gas and steam are simultaneously or intermittently injected into the reservoir. 7. The method of claim 1, wherein the viscosity-reducing gas and steam form a gaseous product comprising carbon dioxide. 8. The method of claim 7, wherein the gaseous product comprises at least 5 percent carbon dioxide by moles of steam and hydrogen. 9. The method of claim 7, wherein the gaseous product comprises 10 percent or more carbon dioxide by moles of steam and hydrogen. 10. The method of claim 7, wherein the gaseous product comprises 25 percent or more carbon dioxide by moles of steam and hydrogen. 11. The method of claim 7, further comprising reducing a steam/oil ratio of the recovered hydrocarbons by increasing a percentage of carbon dioxide in the gaseous product. 12. The method of claim 7, further comprising reducing a steam/oil ratio of the recovered hydrocarbons to below 14.3 by increasing a percentage of carbon dioxide in the gaseous product. 13. The method of claim 7, further comprising reducing a steam/oil ratio of the recovered hydrocarbons to about 5.65 by increasing a percentage of carbon dioxide in the gaseous product. 14. The method of claim 7, further comprising increasing cumulative oil production of the recovered hydrocarbons by increasing a percentage of carbon dioxide in the gaseous product. 15. The method of claim 1, wherein the viscosity-reducing gas is flowed to the burner with the oxidant or the water or steam. 16. The method of claim 1, further comprising at least one of elevating the temperature of the viscosity-reducing gas using heat generated by the burner to deliver heat to the reservoir, and using the viscosity-reducing gas to increase formation pressure in the reservoir. 17. The method of claim 1, wherein the viscosity-reducing gas comprises carbon dioxide. 18. A method for producing hydrocarbons from a reservoir, comprising: positioning a burner comprising a combustion chamber in a first well;supplying a fuel, an oxidant, and one of water or steam from the surface to the burner in the first well;supplying a viscosity-reducing gas from the surface to the reservoir in a conduit separate from the fuel;igniting the fuel and the oxidant in the combustion chamber to generate heat and steam in the burner;injecting the viscosity-reducing gas and steam into the reservoir to reduce the viscosity of and heat hydrocarbons within the reservoir; andrecovering hydrocarbons from the reservoir through a second well that is spaced from or intersects the first well. 19. The method of claim 18, wherein the conduit for supplying the viscosity-reducing gas to the reservoir comprises an annulus of the first well. 20. The method of claim 18, wherein the viscosity-reducing gas and steam are simultaneously or intermittently injected into the reservoir. 21. The method of claim 18, wherein the viscosity-reducing gas and steam form a gaseous product comprising carbon dioxide. 22. The method of claim 21, wherein the gaseous product comprises at least 5 percent carbon dioxide by moles of steam and hydrogen. 23. The method of claim 21, wherein the gaseous product comprises 10 percent or more carbon dioxide by moles of steam and hydrogen. 24. The method of claim 21, wherein the gaseous product comprises 25 percent or more carbon dioxide by moles of steam and hydrogen. 25. The method of claim 21, further comprising reducing a steam/oil ratio of the recovered hydrocarbons by increasing a percentage of carbon dioxide in the gaseous product. 26. The method of claim 21, further comprising reducing a steam/oil ratio of the recovered hydrocarbons to below 14.3 by increasing a percentage of carbon dioxide in the gaseous product. 27. The method of claim 21, further comprising reducing a steam/oil ratio of the recovered hydrocarbons to about 5.65 by increasing a percentage of carbon dioxide in the gaseous product. 28. The method of claim 21, further comprising increasing cumulative oil production of the recovered hydrocarbons by increasing a percentage of carbon dioxide in the gaseous product. 29. The method of claim 18, further comprising at least one of elevating the temperature of the viscosity-reducing gas using heat generated by the burner to deliver heat to the reservoir, and using the viscosity-reducing gas to increase formation pressure in the reservoir. 30. The method of claim 18, wherein the viscosity-reducing gas comprises carbon dioxide. 31. The method of claim 18, wherein the viscosity-reducing gas is flowed to the burner with the oxidant or the water or steam. 32. The method of claim 18, wherein at least one of the first and second wells comprise at least one horizontal, vertical, and slanted well section.