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A downhole heated fluid generation system includes an air subsystem having at least one of an air compressor and an air flow control valve; a fuel subsystem having at least one of a fuel compressor and a fuel flow control valve; a treatment fluid subsystem having a fluid pump; a combustor fluidly co

A downhole heated fluid generation system includes an air subsystem having at least one of an air compressor and an air flow control valve; a fuel subsystem having at least one of a fuel compressor and a fuel flow control valve; a treatment fluid subsystem having a fluid pump; a combustor fluidly coupled to at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem, and operable to provide a heated fluid into a wellbore; and a controller operable to receive an input representing a heated fluid parameter; determine a virtual heated fluid generation rate based at least partially on the heated fluid parameter; and control at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem by the virtual heated fluid generation rate.

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1. A computer-implemented method for controlling a downhole heated fluid generation system, comprising: receiving, into a virtual control system, an input representing a heated fluid parameter that comprises at least one of a heated treatment fluid flow rate or a heated treatment fluid quality;deter

1. A computer-implemented method for controlling a downhole heated fluid generation system, comprising: receiving, into a virtual control system, an input representing a heated fluid parameter that comprises at least one of a heated treatment fluid flow rate or a heated treatment fluid quality;determining a virtual heated fluid generation rate based at least partially on the heated fluid parameter;controlling at least one subsystem of the downhole heated fluid generation system by the virtual heated fluid generation rate;combusting an airflow and a fuel in a downhole combustor of the downhole heated fluid generation system to generate heat; andgenerating steam by applying the generated heat to a treatment fluid supplied to the downhole combustor. 2. The method of claim 1, further comprising: receiving a feedback from the at least one subsystem indicative of a parameter of the subsystem; andadjusting the virtual heated fluid generation rate based at least partially on the feedback. 3. The method of claim 2, further comprising: comparing the feedback indicative of the parameter of the subsystem to a setpoint of the parameter; andadjusting the virtual heated fluid generation rate based at least partially on the comparison of the feedback indicative of the parameter of the subsystem and the setpoint of the parameter. 4. The method of claim 3, wherein adjusting the virtual heated fluid generation rate based at least partially on the determined difference between the feedback and the setpoint comprises reducing the virtual heated fluid generation rate based on the determined difference between the feedback and the setpoint being below a threshold value. 5. The method of claim 2, wherein receiving a feedback from the at least one subsystem comprises receiving a first feedback from a first subsystem of the heated fluid generation system, the method further comprising: receiving a second feedback from a second subsystem;scaling the first and second feedbacks; andadjusting the virtual heated fluid generation rate based at least partially on the scaled first and second feedbacks. 6. The method of claim 5, wherein scaling the first and second feedbacks comprises scaling the first feedback to a first scale and scaling the second feedback to a second scale, the method further comprising: comparing the first scaled feedback and the second scaled feedback. 7. The method of claim 1, wherein the virtual heated fluid generation rate further comprises a time history of the heated fluid parameter. 8. The method of claim 1, further comprising: providing the virtual heated fluid generation rate to an air subsystem of the downhole heated fluid generation system;receiving a first feedback from the air subsystem indicative of a pressure of an air compressor;receiving a second feedback from the air subsystem indicative of a position of an airflow control valve; anddetermining an adjusted virtual heated fluid generation rate based, at least partially, on one or more of the first and second feedbacks from the air subsystem. 9. The method of claim 1, further comprising: providing the virtual heated fluid generation rate to a fuel subsystem of the downhole heated fluid generation system;receiving a third feedback from the fuel subsystem indicative of a pressure of a fuel compressor;receiving a fourth feedback from the fuel subsystem indicative of a position of a fuel flow control valve; anddetermining an adjusted virtual heated fluid generation rate based, at least partially, on one or more of the third and fourth feedbacks from the fuel subsystem. 10. The method of claim 1, further comprising: providing the virtual heated fluid generation rate to a treatment fluid subsystem of the downhole heated fluid generation system;receiving a fifth feedback from the treatment fluid subsystem indicative of a flow rate of an untreated fluid through a first fluid pump;receiving a sixth feedback from the treatment fluid subsystem indicative of a flow rate of a treated fluid through a second fluid pump; anddetermining an adjusted virtual heated fluid generation rate based, at least partially, on one or more of the fifth and sixth feedbacks from the treatment fluid subsystem. 11. The method of claim 1, wherein the heated fluid parameter comprises a desired rate of generation of the heated fluid. 12. The method of claim 1, wherein controlling at least one subsystem of the downhole heated fluid generation system by the virtual heated fluid generation rate comprises controlling all of the subsystems of the downhole heated fluid generation system by the virtual heated fluid generation rate, each of the subsystems having a corresponding rate of response, the method further comprising: maintaining the virtual heated fluid generation rate to control each of the subsystems at a rate less than a slowest corresponding rate of response of the subsystems. 13. A downhole heated fluid generation system, comprising: an air subsystem comprising at least one of an air compressor and an air flow control valve;a fuel subsystem comprising at least one of a fuel compressor and a fuel flow control valve;a treatment fluid subsystem comprising a fluid pump;a combustor fluidly coupled to at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem, the combustor operable to provide a heated fluid into a wellbore; anda controller that comprises a virtual control system, the controller operable to: receive an input representing a heated fluid parameter, the heated fluid parameter comprising at least one of a heated treatment fluid flow rate or a heated treatment fluid quality;determine a virtual heated fluid generation rate based at least partially on the heated fluid parameter;control at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem by the virtual heated fluid generation rate;receive a feedback indicative of a parameter of at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem;adjust the virtual heated fluid generation rate based at least partially on the feedback;compare the feedback indicative of the parameter of at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem to a setpoint of the parameter; andadjust the virtual heated fluid generation rate based at least partially on the comparison of the feedback indicative of the parameter of the subsystem and the setpoint of the parameter. 14. The system of claim 13, wherein the controller is operable to reduce the virtual heated fluid generation rate based on the determined difference between the feedback and the setpoint being below a threshold value. 15. The system of claim 13, wherein the feedback from at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem comprises a first feedback, and the controller is further operable to: receive a second feedback from at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem;scale the first and second feedbacks;adjust the virtual heated fluid generation rate based at least partially on the scaled first and second feedbacks. 16. The system of claim 13, wherein the controller is further operable to control each of the air subsystem, the fuel subsystem, and the treatment fluid subsystem by the virtual heated fluid generation rate, each of the subsystems having a corresponding rate of response, the controller operable to maintain the virtual heated fluid generation rate to control each of the subsystems at a rate less than a slowest corresponding rate of response of the subsystems. 17. The system of claim 13, wherein the controller is operable to: receive a first feedback indicative of a pressure of the air compressor;receive a second feedback indicative of a position of the airflow control valve; andadjust the virtual heated fluid generation rate based at least partially on the first or second feedbacks. 18. The system of claim 13, wherein the combustor comprises a downhole combustor operable to combust an airflow and a fuel to generate heat and to output steam as the heated fluid. 19. The system of claim 13, wherein the virtual heated fluid generation rate further comprises a time history of the heated fluid parameter. 20. A method for controlling a downhole heated fluid generation system, comprising: receiving an input representing a heated fluid parameter;determining a virtual heated fluid generation rate based at least partially on the heated fluid parameter, the virtual heated fluid generation rate comprising a time history of the heated fluid parameter;controlling at least one subsystem of the downhole heated fluid generation system by the virtual heated fluid generation rate;combusting an airflow and a fuel in a downhole combustor of the downhole heated fluid generation system to generate heat; andgenerating steam by applying the generated heat to a treatment fluid supplied to the downhole combustor. 21. A downhole heated fluid generation system, comprising: an air subsystem comprising at least one of an air compressor and an air flow control valve;a fuel subsystem comprising at least one of a fuel compressor and a fuel flow control valve;a treatment fluid subsystem comprising a fluid pump;a combustor fluidly coupled to at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem, the combustor operable to provide a heated fluid into a wellbore; anda controller operable to: receive an input representing a heated fluid parameter;determine a virtual heated fluid generation rate based at least partially on the heated fluid parameter, the virtual heated fluid generation rate comprising a time history of the heated fluid parameter;control at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem by the virtual heated fluid generation rate;receive a feedback indicative of a parameter of at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem;adjust the virtual heated fluid generation rate based at least partially on the feedback;compare the feedback indicative of the parameter of at least one of the air subsystem, the fuel subsystem, or the treatment fluid subsystem to a setpoint of the parameter; andadjust the virtual heated fluid generation rate based at least partially on the comparison of the feedback indicative of the parameter of the subsystem and the setpoint of the parameter.