E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/36
E21B 43/24 (2006.01) E21B 36/02 (2006.01) F23D 11/44 (2006.01) F23M 5/08 (2006.01)
Patent
CA 1170174
DOWNHOLE STEAM GENERATOR WITH IMPROVED PREHEATING, COMBUSTION AND PROTECTION FEATURES ABSTRACT OF THE DISCLOSURE An apparatus for generation of steam in a bore- hole for penetration into an earth formation wherein feedback preheater means are provided for the fuel and water before entering the combustor assembly. First, combustion gases are conducted from the com- bustion chamber to locations in proximity to the water and fuel supplies. Secondly, both hot combustion gases and steam are conducted from the borehole back to the water and fuel supply. The water used for conversion to steam is passed in a countercurrent manner through a plurality of annular water flow chan- nels surrounding the combustion chamber. In this manner, the water is preheated, and the combustion chamber is cooled simultaneously, thereby minimizing thermal stresses and deterioration of the walls of the combustion chamber. The water is injected through slotted inlets along the combustion chamber wall to provide an unstable boundary layer and stripping of the water from the wall for efficient steam genera- tion. Pressure responsive doors are provided at the steam outlet of the combustor assembly. The outlet doors and fluid flow functions may be controlled by a diagnostic/control module. The module is positioned in the water flow channel to maintain a relatively constant, controlled temperature.
393351
Meredith & Finlayson
The Government Of The United States As Represented By The United
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