A method and system for recovery of hydrocarbons from a hydrocarbon-bearing formation. A gaseous component of the produced hydrocarbon-containing fluid is separated from the fluid. The gaseous component is combusted with air in a power plant. Mixing and compressing of the gaseous component and air a
A method and system for recovery of hydrocarbons from a hydrocarbon-bearing formation. A gaseous component of the produced hydrocarbon-containing fluid is separated from the fluid. The gaseous component is combusted with air in a power plant. Mixing and compressing of the gaseous component and air are realized to produce a flammable and pressurized gas-air mixture prior to combustion. An exhaust gas resulting from combustion is injected into the formation.
대표청구항▼
What is claimed is: 1. A method of recovering hydrocarbons from a hydrocarbon-bearing formation, the method comprising: recovering a hydrocarbon-containing fluid from the formation through at least one production well; separating a gaseous component of the fluid from the fluid; combusting at least
What is claimed is: 1. A method of recovering hydrocarbons from a hydrocarbon-bearing formation, the method comprising: recovering a hydrocarbon-containing fluid from the formation through at least one production well; separating a gaseous component of the fluid from the fluid; combusting at least a part of the gaseous component with air in an internal combustion engine which is comprised in a power plant and adapted to operate by said combustion, wherein said air and said at least a part of the gaseous component are mixed and a gas-air mixture resulting from said mixing is compressed, so as to produce a flammable and pressurized gas-air mixture prior to said combustion, and wherein an exhaust gas resulting from said combustion is discharged from said internal combustion engine; and injecting a gas, comprising at least a part of the exhaust gas, into the formation through at least one injection well. 2. The method of claim 1, wherein energy is produced in the power plant, and wherein the energy is at least one selected from the group consisting of mechanical energy, electrical energy and heat energy. 3. The method of claim 1, wherein the exhaust gas comprises carbon dioxide and nitrogen. 4. The method of claim 1, wherein said gas, comprising at least a part of the exhaust gas, is treated for removal of moisture, or corrosive substances, or both, prior to said gas, comprising at least a part of the exhaust gas, being injected into the formation through said injection well. 5. The method of claim 1, wherein a part of the exhaust gas is added to said air, or to said at least a part of the gaseous component, or to both, prior to said air and said at least a part of the gaseous component being mixed. 6. The method of claim 1, wherein a part of the exhaust gas is added to the gas-air mixture prior to said combustion. 7. The method of claim 1, wherein a pressure of said flammable and pressurized gas-air mixture is at least about 1 MPa. 8. The method of claim 1, wherein the gas-air mixture or said at least a part of the gaseous component is heated prior to said compression. 9. The method of claim 1, wherein a ratio between said air, contained in the gas-air mixture, and said at least a part of the gaseous component, contained in the gas-air mixture, is maintained so, that the gas-air mixture comprises no more of said air than it is necessary for oxidizing combustible constituents of said at least a part of the gaseous component. 10. The method of claim 1, wherein heavy hydrocarbons are removed from said at least a part of the gaseous component prior to said mixing. 11. The method of claim 1, wherein said at least a part of the gaseous component is treated for removal of moisture, or corrosive substances, or both, prior to said mixing. 12. The method of claim 1, wherein said combustion is combustion of said at least a part of the gaseous component with said air without adding an additional combustible substance to the gas-air mixture, or to said at least a part of the gaseous component, or to both. 13. The method of claim 1, wherein said combustion is combustion of said at least a part of the gaseous component with said air without removal of an inert gas from said at least a part of the gaseous component prior to the combustion. 14. The method of claim 1, wherein said combustion is combustion of said at least a part of the gaseous component with said air without adding oxygen to the gas-air mixture, or to said air, or to both. 15. A method of recovering hydrocarbons from a hydrocarbon-bearing formation, the method comprising: recovering a hydrocarbon-containing fluid from the formation through at least one production well; separating a gaseous component of the fluid from the fluid; combusting at least a part of the gaseous component with air in an internal combustion engine which is comprised in a power plant and adapted to operate by said combustion, wherein said air and said at least a part of the gaseous component are compressed and then are mixed, so as to produce a flammable and pressurized gas-air mixture prior to said combustion, and wherein an exhaust gas resulting from said combustion is discharged from said internal combustion engine; and injecting a gas, comprising at least a part of the exhaust gas, into the formation through at least one injection well. 16. The method of claim 15, wherein energy is produced in the power plant, and wherein the energy is at least one selected from the group consisting of mechanical energy, electrical energy and heat energy. 17. The method of claim 15, wherein the exhaust gas comprises carbon dioxide and nitrogen. 18. The method of claim 15, wherein said gas, comprising at least a part of the exhaust gas, is treated for removal of moisture, or corrosive substances, or both, prior to said gas, comprising at least a part of the exhaust gas, being injected into the formation through said injection well. 19. The method of claim 15, wherein a part of the exhaust gas is added to said at least a part of the gaseous component, or to said flammable and pressurized gas-air mixture, or to both, prior to said combustion. 20. The method of claim 15, wherein a pressure of said flammable and pressurized gas-air mixture is at least about 1 MPa. 21. The method of claim 15, wherein a ratio between said air, contained in said flammable and pressurized gas-air mixture, and said at least a part of the gaseous component, contained in said flammable and pressurized gas-air mixture, is maintained so, that said flammable and pressurized gas-air mixture comprises no more of said air than it is necessary for oxidizing combustible constituents of said at least a part of the gaseous component. 22. The method of claim 15, wherein heavy hydrocarbons are removed from said at least a part of the gaseous component prior to said mixing. 23. The method of claim 15, wherein said at least a part of the gaseous component is treated for removal of moisture, or corrosive substances, or both, prior to said compression. 24. A system for recovery of hydrocarbons from a hydrocarbon-bearing formation penetrated by at least one injection well, and, by at least one production well which contains means for separating a gaseous component of a hydrocarbon-containing fluid from the fluid, the system comprising: a power plant which comprises an internal combustion engine adapted to operate by combusting at least a part of the gaseous component with air, wherein said internal combustion engine is adapted to discharge an exhaust gas resulting from said combustion and adapted to produce a flammable and pressurized gas-air mixture comprising said at least a part of the gaseous component and said air, and wherein said internal combustion engine is adapted to produce said flammable and pressurized gas-air mixture prior to said combustion; and means for injecting a gas, comprising at least a part of the exhaust gas, into the formation through said injection well. 25. The system of claim 24 further comprising: a device selected from the group consisting of a pump, an electric generator and a compressor, said internal combustion engine being adapted for driving the selected device. 26. The system of claim 24, wherein said means for injecting a gas comprises a compressor adapted to be driven by said internal combustion engine. 27. The system of claim 24, wherein said internal combustion engine is one selected from the group consisting of a gas engine, a gas turbine engine and a gas-diesel engine. 28. The system of claim 24 further comprising: means for adding a part of the exhaust gas into said flammable and pressurized gas-air mixture, or into said at least a part of the gaseous component, or into both. 29. The system of claim 24 further comprising: means for removing heavy hydrocarbons. 30. The system of claim 24 further comprising: means for heating said flammable and pressurized gas-air mixture, or said at least a part of the gaseous component, or both. 31. The system of claim 24 further comprising: a waste-heat boiler to utilize the exhaust gas heat. 32. The system of claim 24 further comprising: means for purifying the exhaust gas from moisture, or corrosive substances, or both. 33. The system of claim 24, wherein said internal combustion engine is an internal combustion engine adapted to operate by combusting said at least a part of the gaseous component with said air without removal of an inert gas from said at least a part of the gaseous component prior to said combustion. 34. The system of claim 24, wherein said internal combustion engine is an internal combustion engine adapted to operate by combusting said at least a part of the gaseous component with said air without adding an additional combustible substance to said flammable and pressurized gas-air mixture, or to said at least a part of the gaseous component, or to both. 35. The system of claim 24, wherein said internal combustion engine is an internal combustion engine adapted to operate by combusting said at least a part of the gaseous component with said air without adding oxygen to said flammable and pressurized gas-air mixture, or to said air, or to both. 36. A system for recovery of hydrocarbons from a hydrocarbon-bearing formation penetrated by at least one injection well, and, by at least one production well which is in fluid communication with a separator, said separator being adapted to separate a gaseous component of a hydrocarbon-containing fluid from the fluid, the system comprising: a power plant which comprises an internal combustion engine adapted to operate by combusting at least a part of the gaseous component with air, wherein said internal combustion engine is adapted to discharge an exhaust gas resulting from said combustion and adapted to produce a flammable and pressurized gas-air mixture comprising said at least a part of the gaseous component and said air, and wherein said internal combustion engine is adapted to produce said flammable and pressurized gas-air mixture prior to said combustion; and means for injecting a gas, comprising at least a part of the exhaust gas, into the formation through said injection well. 37. The system of claim 36 further comprising: a device selected from the group consisting of a pump, an electric generator and a compressor, said internal combustion engine being adapted for driving the selected device. 38. The system of claim 36, wherein said means for injecting a gas comprises a compressor adapted to be driven by said internal combustion engine. 39. The system of claim 36, wherein said internal combustion engine is one selected from the group consisting of a gas engine, a gas turbine engine and a gas-diesel engine. 40. The system of claim 36 further comprising: means for adding a part of the exhaust gas into said flammable and pressurized gas-air mixture, or into said at least a part of the gaseous component, or into both. 41. The system of claim 36 further comprising: means for removing heavy hydrocarbons. 42. The system of claim 36 further comprising: means for heating said flammable and pressurized gas-air mixture, or said at least a part of the gaseous component, or both. 43. The system of claim 36 further comprising: a waste-heat boiler to utilize the exhaust gas heat. 44. The system of claim 36 further comprising: means for purifying the exhaust gas from moisture, or corrosive substances, or both. 45. The system of claim 36, wherein said internal combustion engine is an internal combustion engine adapted to operate by combusting said at least a part of the gaseous component with said air without removal of an inert gas from said at least a part of the gaseous component prior to said combustion. 46. The system of claim 36, wherein said internal combustion engine is an internal combustion engine adapted to operate by combusting said at least a part of the gaseous component with said air without adding an additional combustible substance to said flammable and pressurized gas-air mixture, or to said at least a part of the gaseous component, or to both. 47. The system of claim 36, wherein said internal combustion engine is an internal combustion engine adapted to operate by combusting said at least a part of the gaseous component with said air without adding oxygen to said flammable and pressurized gas-air mixture, or to said air, or to both.
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