Аннотация:This paper presents the results of analysis of the effectiveness of
thermo-chemical treatment methods using water solutions of binary mixtures of
ammonium nitrate on low-permeable hydrocarbon reservoirs. The reasons for a
multiple long-term increase of production rate of wells in low-permeable formations after thermochemical treatment, accompanied by a significant thermal
heating of the prolonged reservoir matrix treatment with exothermic reaction of
working agent decomposition, are determined. This determination is based on
the results of mathematical modeling of field experiments and analysis of experimental work on hydrothermal treatment and pyrolysis of kerogencontaining rocks core samples. It is shown that, opposite to the classical thermal
methods of hydrocarbon layers treatment, not only the fluid viscosity decreases,
but also phase transformation mechanisms of various hydrocarbon components,
including those originally included in the rock matrix, are engaged. The analysis of Romashkinskoye field core samples pyrolysis data shows a change in the
composition of organic matter and residual oil, the start of generation processes
and their engagement due to hydro-thermolysis.