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A system and a method for recovering hydrocarbons from a reservoir containing hydrocarbons, by in-situ combustion. The system includes a primary liquid production wellbore having a substantially horizontal primary production length extending through the reservoir, a vent well in fluid communication

A system and a method for recovering hydrocarbons from a reservoir containing hydrocarbons, by in-situ combustion. The system includes a primary liquid production wellbore having a substantially horizontal primary production length extending through the reservoir, a vent well in fluid communication with the reservoir at a venting position which is relatively higher in the reservoir than the primary production length, an injector apparatus in fluid communication with the reservoir along an injection line in the reservoir which is relatively higher in the reservoir than the primary production length and relatively lower in the reservoir than the venting position, and an injection gas source connected with the injector apparatus. The method includes providing the system, injecting an injection gas containing oxygen into the reservoir to cause combustion of hydrocarbons contained in the reservoir, producing hydrocarbon liquid from the primary liquid production wellbore, and venting combustion gases from the vent well.

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The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A system for recovering a hydrocarbon liquid from a subterranean reservoir containing hydrocarbons, the system comprising: (a) a primary liquid production wellbore having a substantial

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A system for recovering a hydrocarbon liquid from a subterranean reservoir containing hydrocarbons, the system comprising: (a) a primary liquid production wellbore having a substantially horizontal primary production length which extends through the reservoir, wherein the primary production length is positioned substantially within a vertical primary production plane; (b) at least one vent well in fluid communication with the reservoir at a venting position in the reservoir which is relatively higher in the reservoir than the primary production length; (c) an injector apparatus in fluid communication with the reservoir along an injection line in the reservoir which is substantially parallel with the primary production plane, wherein the injection line extends along at least a portion of the primary production length, wherein the injection line is relatively higher in the reservoir than the primary production length, and wherein the injection line is relatively lower in the reservoir than the venting position; and (d) an injection gas source comprising a source of an injection gas containing oxygen connected with the injector apparatus, for supplying the injection gas containing oxygen to the injector apparatus for injecting along the injection line in order to cause combustion of the hydrocarbons contained in the reservoir. 2. The system as claimed in claim 1 wherein the injection line is positioned substantially within the primary production plane. 3. The system as claimed in claim 1 wherein the injector apparatus is comprised of an injection wellbore having a substantially horizontal injection length and wherein the injection line is comprised of the injection length of the injection wellbore. 4. The system as claimed in claim 1 wherein the injector apparatus is comprised of a plurality of injection wellbores and wherein each of the injection wellbores is in fluid communication with the reservoir along the injection line. 5. The system as claimed in claim 4 wherein the injector apparatus is comprised of a row of substantially vertical injection wellbores. 6. The system as claimed in claim 1 wherein the venting position is laterally offset from the primary production plane. 7. The system as claimed in claim 6 wherein the at least one vent well is comprised of a plurality of vent wells, wherein the venting position is comprised of a plurality of venting positions provided by the plurality of vent wells, and wherein each of the venting positions is laterally offset from the primary production plane. 8. The system as claimed in claim 7 wherein at least one of the venting positions is laterally offset from the primary production plane on a first side of the primary production plane and wherein at least one of the venting positions is laterally offset from the primary production plane on a second side of the primary production plane. 9. The system as claimed in claim 7 wherein at least one of the venting positions is laterally offset from the primary production plane by a first venting distance on a first side of the primary production plane, wherein at least one of the venting positions is laterally offset from the primary production plane by a second venting distance on the first side of the primary production plane, and wherein the second venting distance is greater than the first venting distance. 10. The system as claimed in claim 1, further comprising a first offset liquid production wellbore having a substantially horizontal first offset production length which extends through the reservoir, wherein the first offset production length is laterally offset from the primary production plane by a first production distance on a first side of the primary production plane. 11. The system as claimed in claim 10 wherein the injection line is relatively higher in the reservoir than the first offset production length. 12. The system as claimed in claim 10 wherein the first offset production length is substantially parallel with the primary production plane. 13. The system as claimed in claim 10, further comprising a second offset liquid production wellbore having a substantially horizontal second offset production length which extends through the reservoir, wherein the second offset production length is laterally offset from the primary production plane by a second distance on the first side of the primary production plane, and wherein the second production distance is greater than the first production distance. 14. The system as claimed in claim 13 wherein the injection line is relatively higher in the reservoir than the second offset production length. 15. The system as claimed in claim 13 wherein the second offset production length is substantially parallel with the primary production plane. 16. The system as claimed in claim 13, further comprising a third offset liquid production wellbore having a substantially horizontal third offset production length which extends through the reservoir, wherein the third offset production length is laterally offset from the primary production plane by a third production distance on a second side of the primary production plane. 17. The system as claimed in claim 16 wherein the injection line is relatively higher in the reservoir than the third offset production length. 18. The system as claimed in claim 16 wherein the third offset production length is substantially parallel with the primary production plane. 19. The system as claimed in claim 16, further comprising a fourth offset liquid production wellbore having a substantially horizontal fourth offset production length which extends through the reservoir, wherein the fourth offset production length is laterally offset from the primary production plane by a fourth production distance on the second side of the primary production plane, and wherein the fourth production distance is greater than the third production distance. 20. The system as claimed in claim 19 wherein the injection line is relatively higher in the reservoir than the fourth offset production length. 21. The system as claimed in claim 19 wherein the fourth offset production length is substantially parallel with the primary production plane. 22. The system as claimed in claim 19 wherein the third offset liquid production wellbore and the first offset liquid production wellbore comprise a first set of offset liquid production wellbores, wherein the fourth offset liquid production wellbore and the second offset liquid production wellbore comprise a second set of offset liquid production wellbores, wherein the third production distance is substantially equal to the first production distance, and wherein the fourth production distance is substantially equal to the second production distance. 23. The system as claimed in claim 10, further comprising a third offset liquid production wellbore having a substantially horizontal third offset production length which extends through the reservoir, wherein the third offset production length is laterally offset from the primary production plane by a third production distance on a second side of the primary production plane. 24. The system as claimed in claim 23 wherein the injection line is relatively higher in the reservoir than the third offset production length. 25. The system as claimed in claim 23 wherein the third offset production length is substantially parallel with the primary production plane. 26. A method for recovering a hydrocarbon liquid from a subterranean reservoir containing hydrocarbons, the method comprising: (a) providing a primary liquid production wellbore having a substantially horizontal primary production length which extends through the reservoir, wherein the primary production length is positioned substantially within a vertical primary production plane; (b) providing at least one vent well in fluid communication with the reservoir at a venting position in the reservoir which is relatively higher in the reservoir than the primary production length; (c) providing an injector apparatus in fluid communication with the reservoir along an injection line in the reservoir which is substantially parallel with the primary production plane, wherein the injection line extends along at least a portion of the primary production length, wherein the injection line is relatively higher in the reservoir than the primary production length, and wherein the injection line is relatively lower in the reservoir than the venting position; (d) injecting an injection gas containing oxygen into the reservoir along the injection line in order to cause combustion of the hydrocarbons contained in the reservoir, thereby heating the reservoir so that the hydrocarbon liquid drains toward the primary liquid production wellbore; (e) producing the hydrocarbon liquid from the primary liquid production wellbore; and (f) venting, from the vent well, gases contained in the reservoir. 27. The method as claimed in claim 26, further comprising injecting steam into the reservoir along the injection line for a steam injection period before injecting the injection gas into the reservoir. 28. The method as claimed in claim 26 wherein the injection line is positioned substantially within the primary production plane. 29. The method as claimed in claim 26 wherein the injector apparatus is comprised of an injection wellbore having a substantially horizontal injection length and wherein the injection line is comprised of the injection length of the injection wellbore. 30. The method as claimed in claim 26 wherein the injector apparatus is comprised of a plurality of injection wellbores and wherein each of the injection wellbores is in fluid communication with the reservoir along the injection line. 31. The method as claimed in claim 30 wherein the injector apparatus is comprised of a row of substantially vertical injection wellbores. 32. The method as claimed in claim 26 wherein the venting position is laterally offset from the primary production plane. 33. The method as claimed in claim 32 wherein the at least one vent well is comprised of a plurality of vent wells, wherein the venting position is comprised of a plurality of venting positions provided by the plurality of vent wells, and wherein each of the venting positions is laterally offset from the primary production plane. 34. The method as claimed in claim 33 wherein at least one of the venting positions is laterally offset from the primary production plane on a first side of the primary production plane and wherein at least one of the venting positions is laterally offset from the primary production plane on a second side of the primary production plane. 35. The method as claimed in claim 33 wherein at least one of the venting positions is laterally offset from the primary production plane by a first venting distance on a first side of the primary production plane, wherein at least one of the venting positions is laterally offset from the primary production plane by a second venting distance on the first side of the primary production plane, and wherein the second venting distance is greater than the first venting distance. 36. The method as claimed in claim 26, further comprising providing a first offset liquid production wellbore having a substantially horizontal first offset production length which extends through the reservoir, wherein the first offset production length is laterally offset from the primary production plane by a first production distance on a first side of the primary production plane, and further comprising producing the hydrocarbon liquid from the first offset liquid production wellbore. 37. The method as claimed in claim 36, further comprising ceasing producing the hydrocarbon liquid from the primary liquid production wellbore upon detection of a threshold amount of a breakthrough gas at the primary liquid production wellbore. 38. The method as claimed in claim 36 wherein the injection line is relatively higher in the reservoir than the first offset production length. 39. The method as claimed in claim 36 wherein the first offset production length is substantially parallel with the primary production plane. 40. The method as claimed in claim 36, further comprising providing a second offset liquid production wellbore having a substantially horizontal second offset production length which extends through the reservoir, wherein the second offset production length is laterally offset from the primary production plane by a second production distance on the first side of the primary production plane, wherein the second production distance is greater than the first production distance, and further comprising producing the hydrocarbon liquid from the second offset liquid production wellbore. 41. The method as claimed in claim 40, further comprising ceasing producing the hydrocarbon liquid from the primary liquid production wellbore upon detection of a threshold amount of a breakthrough gas at the primary liquid production wellbore. 42. The method as claimed in claim 40, further comprising ceasing producing the hydrocarbon liquid from the first offset liquid production wellbore upon detection of a threshold amount of a breakthrough gas at the first offset liquid production wellbore. 43. The method as claimed in claim 42, further comprising injecting the injection gas into the reservoir along the first offset production length after ceasing producing the hydrocarbon liquid from the first offset liquid production wellbore. 44. The method as claimed in claim 43, further comprising injecting into the reservoir along the injection line at least a portion of the gases which are vented from the vent well. 45. The method as claimed in claim 43, further comprising injecting into the reservoir along the primary production length at least a portion of the gases which are vented from the vent well. 46. The method as claimed in claim 40 wherein the injection line is relatively higher in the reservoir than the second offset production length. 47. The method as claimed in claim 40 wherein the second offset production length is substantially parallel with the primary production plane.