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The conditions for transition to a state of supercritical (SC) fluid in the hydrocarbons-water sys tem are examined. A method for thermochemical heating the productive stratum near the oil well involving the transition of the oil-water formation fluid to the SC state (homogeneous, inseparable, and extremely fluid) is proposed. New chemical compositions, binary mixtures (BMs) of nitrates of organic amines (organic nitrate) and initiators of their decomposition, capable of ensuring the transition of the fluid to the supercrit ical state at the expense of high pressures and temperatures generated by rock pressure and heat of the exo thermic reaction of BM are tested. The effectiveness of the scheme of production of formation fluid in water flooded oil fields is assessed.