E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/36
E21B 43/243 (2006.01) E21B 36/02 (2006.01) F22B 3/04 (2006.01) F22B 21/06 (2006.01) F23D 11/44 (2006.01)
Patent
CA 1170173
DOWNHOLE STEAM GENERATOR USING LOW PRESSURE FUEL AND AIR SUPPLY ABSTRACT OF THE DISCLOSURE An apparatus for generation of steam in a borehole for penetration into an earth formation wherein a spiral, tubular heat exchanger is used in the combustion chamber to isolate the combustion process from the water being superheated for conversion into steam. The isolation allows combustion of a relatively low pressure oxidant and fuel mixture for generating high enthalpy steam. The fuel is preheated by feedback of combustion gases from the top of the combustion chamber through a fuel preheater chamber. The hot exhaust gases of combustion of the bottom of the combustion chamber, after flowing over the heat exchanger enter an exhaust passage and pipe. The exhaust pipe is mounted inside the water supply line heating the water flowing into the heat exchanger. After being superheated in the heat exchanger, the water is ejected through an expansion nozzle and converts into steam prior to penetration into the earth formation. Pressure responsive doors are provided at a steam outlet downstream of the nozzle and close when the steam pressure is lost due to flameout.
393346
Meredith & Finlayson
The Government Of The United States As Represented By The United
LandOfFree
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