The report presents an advanced stimulation technology to increase well productivity and recovery of unconvencional oil and gas reserves based on a multistage thermal-gas-and-chemical process, wherein gases (first of all hydrogen, and hot acids – nitrogen acid and hydrogen acid, and sometimes fluoric acid) are formed at the bottomhole of the well.

Hydrogen is generated at the initial stage of the thermal-gas-and-chemical process and it improves permeability of tight formations, and fosters filtration of active chemical components into the formation, where secondary reactions of its mineral part and colmatants take place. Hydrogen cracking of ARPD (asphalt, resin, and paraffin deposition) occurs during the high temperature stage of the process (250-350 °C) under high pressures, and in the presence of atomic and molecular hydrogen and catalyst agents leading to formation of vapory and distilled fractions.

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