| CPC E21B 43/162 (2013.01) [C09K 8/592 (2013.01); E21B 43/01 (2013.01); E21B 43/248 (2013.01); E21B 47/07 (2020.05)] | 11 Claims | 

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               1. A system for heating of unrecovered oil, said system comprising: 
            i. a chemical injection well having at least one subterranean outlet; 
                ii. an oil production well with at least one subterranean inlet; 
                iii. wherein said subterranean outlet is lower in elevation than said at least one inlet, and wherein said chemical injection well is separate and apart from said oil production well; 
                wherein said chemical injection well is coupled to an injected reactant source, and wherein said injected reactant source reacts with a second reactant in an exothermic reaction which produces hydrogen gas, and wherein said reactant source comprises aqueous sodium; and wherein said second reactant comprises water; 
                a controller, and wherein said controller receives data from said oil production well and uses said data to control the release of said injected reactant source and to control the exothermic reaction. 
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