Abstract: A method is provided for applying a thermal process to a lower zone underlying an overlying hydrocarbon zone with thermal energy from the thermal process mobilizing oil in the overlying zone. The lower zone itself could be a hydrocarbon zone undergoing thermal EOR. Further, one can economically apply a thermal EOR process to an oil formation of low mobility and having an underlying zone such as a basal water zone. Introduction gas and steam, the gas having a higher density than the steam, into the underlying zone displaces the basal water and creates an insulating layer of gas between the steam and the basal water maximizing heat transfer upwardly and mobilizing viscous oil greatly reducing the heat loss to the basal water, economically enhancing production from thin oil bearing zones with underlying basal water which are not otherwise economic by other known EOR processes.

Abstract: A method for initiating steam assisted gravity drainage (SAGD) mobilization and recovery of hydrocarbons in a hydrocarbon-bearing formation includes initially forming a circulation path by connecting SAGD injection well and a circulation well. The circulation well can be a SAGD production well or a separate well completed adjacent a toe of the injection well. Initially, a thermal carrier such as steam or flue gases, is circulated, forming a thermal chamber about the injection well. One initial start-up is complete, the circulation path is decoupled for further propagating the thermal chamber and establishing steady-state SAGD operations.

Abstract: A burner is arranged for access to a cavity in a target zone of a hydrocarbon reservoir. The burner is operated into the cavity to create and sustain hot combustion gases at a steady state for flowing into and permeating through the target zone. Water is injected into the target zone and permeates laterally therein. The hot combustion gases and the water in the target zone interact to form a steam drive front in the hydrocarbon reservoir.

Abstract: High permeability channels or wormholes found in hydrocarbon reservoirs having hydrocarbon-bearing formations can be remediated by heating the formation with dry, hot flue gases, injecting produced water into the formation through an injection well, and forming steam within the formation and spaced away from the injection well. The steam can be created at a steam generation interface occurring between a dry, hot gaseous drive front and an injected water front. Managing a quality of the steam formed along the steam generation interface, by increasing the combustion gas flow rate or decreasing the rate of water injection, allows for the initiation of precipitation and controlled deposition of solids dissolved in the produced water.

Abstract: A method is provided for applying a thermal process to a lower zone underlying an overlying hydrocarbon zone with thermal energy from the thermal process mobilizing oil in the overlying zone. The lower zone itself could be a hydrocarbon zone undergoing thermal EOR. Further, one can economically apply a thermal EOR process to an oil formation of low mobility and having an underlying zone such as a basal water zone. Introduction gas and steam, the gas having a higher density than the steam, into the underlying zone displaces the basal water and creates an insulating layer of gas between the steam and the basal water maximizing heat transfer upwardly and mobilizing viscous oil greatly reducing the heat loss to the basal water, economically enhancing production from thin oil bearing zones with underlying basal water which are not otherwise economic by other known EOR processes.