Method of direct steam generation using an oxyfuel combustor

A method for direct steam and CO2 mixed gas generation and utilization, including the steps of:

• providing a gas generator having a combustion chamber, an oxygen inlet leading into the combustion chamber, a fuel inlet leading into the combustion chamber, a plurality of water inlets leading into the gas generator and a steam and CO2 mixture outlet from the combustion chamber;
• configuring the gas generator to include multiple adjacent chambers with separate water inlets passing into the gas generator between the adjacent chambers, such that temperatures in the adjacent chambers are progressively lower as distance from the combustion chamber increases;
• coupling the steam and CO2 mixture outlet of the gas generator to an inlet of a steam and CO2 utilizing processor;
• configuring the processor to be in the form of a steam assisted gravity drain site including a hydrocarbon containing subterranean space and a well extending into the subterranean space, the well coupled to the steam and CO2 mixture outlet of the gas generator;
• recirculating at least a portion of water and hydrocarbons exiting from a drain of the steam assisted gravity drain site to the water inlets of the gas generator;
• and
• combusting at least a portion of the hydrocarbons contained within the water within the gas generator.