A variety of methods for thermal recovery of natural gas and bitumen from a formation containing the latter. In general, the methods incorporate a series of existing, but previously uncombined technologies. A modified flue gas from the steam generators conventionally used in a SAGD recovery operati
A variety of methods for thermal recovery of natural gas and bitumen from a formation containing the latter. In general, the methods incorporate a series of existing, but previously uncombined technologies. A modified flue gas from the steam generators conventionally used in a SAGD recovery operation is injected into the formation to enhance recovery with the produced fluids, natural gas, bitumen, inter alia are further processed. The injection of the flue gas conveniently is disposed of and further acts to repressurize the formation which otherwise becomes depressurized when depleted of natural gas. Accordingly, environmental and economic advantages are realized with the methodology.
대표청구항▼
We claim: 1. A method for recovering heavy oil and bitumen from a subterranean formation containing heavy oil and bitumen, comprising: providing a fuel; providing steam generation means for generating steam and injecting said steam into said subterranean formation; providing a flue gas recirculatio
We claim: 1. A method for recovering heavy oil and bitumen from a subterranean formation containing heavy oil and bitumen, comprising: providing a fuel; providing steam generation means for generating steam and injecting said steam into said subterranean formation; providing a flue gas recirculation circuit; burning said fuel in a flue gas recirculation circuit to produce a modified flue gas for injection into said formation; and injecting said flue gas and said steam into said formation to displace said heavy oil and bitumen. 2. The method as set forth in claim 1, wherein said fuel is a fossil fuel. 3. The method as set forth in claim 2, wherein said fuel is selected from the group consisting of natural gas, fuel oil, heavy oil, bitumen, residuum, emulsified fuel, multiphase superfine atomized residue, asphaltenes, petcoke, coal and combinations thereof. 4. The method as set forth in claim 1, wherein said fuel is combusted in a steam generator with oxygen and air. 5. The method as set forth in claim 1, further including the step of modifying said flue gas prior to injection into said formation. 6. The method as set forth in claim 5, including removing byproduct gas generated during said step of modifying. 7. The method as set forth in claim 6, wherein said byproduct gas includes at least one of hydrogen, carbon monoxide, nitrogen, nitrogen oxides, sulfur oxides, and carbon dioxide. 8. The method as set forth in claim 5, including removing particulate ash. 9. The method as set forth in claim 5, wherein said step of modifying said flue gas comprises unit operations including departiculation, quenching, compression and dehydration. 10. The method as set forth in claim 5, wherein modified flue gas is injected into said formation for repressurizing said formation and releasing natural gas within said formation. 11. The method as set forth in claim 10, wherein heavy oil is displaced from said formation during repressurization. 12. The method as set forth in claim 11, further including the step of modifying said displaced heavy oil with upgrading unit operations. 13. The method as set forth in claim 12, wherein said upgrading unit operations includes water removal from oil displaced from said formation. 14. The method as set forth in claim 13, wherein at least a portion of removed water is recirculated into said steam generator. 15. The method as set forth in claim 12, wherein at least a portion of the residuum from the upgraded heavy oil is converted to a multiphase superfine atomized residue for use as a combustion fuel. 16. A method for recovering gas and bitumen from at least one of a steam assisted gravity drainage formation containing gas over bitumen within the volume of said formation and from a geographically proximate formation, comprising; providing a flue gas recirculation circuit to produce modified flue gas; injecting said modified flue gas within said volume at a pressure sufficient to displace said gas over said bitumen and to displace said bitumen from within said formation; recovering displaced gas and bitumen; and repressurizing or maintaining the pressure of said volume with said modified flue gas to a pressure substantially similar to a pressure prior to injection of said modified flue gas. 17. The method as set forth in claim 16, wherein said displaced gas comprises natural gas not in direct geological contact with the bitumen. 18. The method as set forth in claim 16, further including the step of forming a composition of said modified flue gas for maximizing the volume of displaced gas. 19. The method as set forth in claim 18, wherein said step of forming a composition of said modified flue gas includes maintaining an oxygen concentration in said modified flue gas selected from the group consisting of excess, stoichiometric and sub stoichiometric. 20. The method as set forth in claim 18, wherein said composition of said modified flue gas comprises between 0% and 79% by volume nitrogen. 21. The method as set forth in claim 16, wherein subsequent to displaced gas recovery, modified flue gas injection continues to a pressure substantially similar to original geological pressures for sequestering of green house gases GHG. 22. The method as set forth in claim 16, wherein said flue gas recirculation circuit is fueled with a hydrocarbon fuel selected from the group consisting of natural gas, fuel oil, heavy oil, bitumen, residuum, vacuum residuum, emulsified fuel, multiphase superfine atomized residue, asphaltenes, petcoke, coal and combinations thereof. 23. A method for recovering gas and bitumen from at least one of a steam assisted gravity drainage formation containing gas over bitumen within the volume of said formation and from a geographically proximate formation, comprising; a steam generation phase for generating steam for injection into said formation; a flue gas recirculation phase for modifying flue gas for injection into said formation; an injection phase for injecting modified flue gas into said formation for displacing gas over said bitumen and maintaining the pressure of or repressurizing said formation; and a processing phase for processing produced displaced gas and liquid liberated from said injection phase. 24. A method for recovering heavy oil and bitumen from a subterranean formation containing heavy oil and bitumen, comprising: providing a fuel; burning said fuel in a flue gas recirculation circuit to produce a flue gas for injection into said formation; modifying said flue gas prior to injection injecting modified flue gas into said formation to repressurize said formation while releasing natural gas and heavy oil therefrom; upgrading recovered heavy oil; and converting at least a portion of residuum to multiphase superfine atomized residue for use as a fuel. 25. A method for recovering gas and bitumen from at least one of a steam assisted gravity drainage formation containing gas over bitumen within the volume of said formation and from a geographically proximate formation, comprising; providing a flue gas recirculation circuit to produce modified flue gas; generating by-product gas from said modified flue gas; injecting said modified flue gas within said volume at a pressure sufficient to displace said gas over said bitumen and to displace said bitumen from within said formation; recovering displaced gas and bitumen; and repressurizing or maintaining the pressure of said volume with said modified flue gas to a pressure substantially similar to a pressure prior to injection of said modified flue gas. 26. The method as set forth in claim 25, wherein said byproduct gas includes one of hydrogen, carbon monoxide, nitrogen oxides, sulfur oxides and carbon dioxide.
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