SUPERCRITICAL HYDROTHERMAL COMBUSTION-TYPE DOWNHOLE STEAM GENERATOR FOR HEAVY OIL THERMAL RECOVERY

摘要

A supercritical hydrothermal combustion-type downhole steam generator for heavy oil thermal recovery, mainly composed of a top end cover (6), a middle end cover (9), a backflow stable combustion zone housing (12), a main reaction zone housing (15) and a blending zone housing (16) which are connected and assembled in sequence; the top end cover is provided with a swirler fuel inlet (1) and a heating rod (5), a heating rod insertion hole runs through the center of the middle end cover, the middle end cover is provided with a main combustion hole jet fuel inlet (2), a main combustion hole jet oxidant inlet (7), a cooling water inlet (8) and a swirl nozzle (10), the swirl nozzle is in communication with the swirler fuel inlet, the backflow stable combustion zone housing has an inner side circumferentially wrapping a combined spiral wall (13), and a bottom end provided with a main combustion nozzle structure (14), the inner wall of the main reaction zone housing is a spiral cooling wall (4), and the main combustion hole jet oxidant inlet, the main combustion hole jet fuel inlet and the cooling water inlet are in communication with the main combustion nozzle structure and the spiral cooling wall by means of inner, middle and outer channels of the combined spiral wall, respectively. The steam generator achieves efficient steam generation directly in the formation, avoiding heat loss during steam delivery.