Presented in the paper are the results of pilot-commercial thermal cyclic stimulation of wells performed in various producing intervals of Zybza-Glubokiy Yar field containing heavy (with density of 0.975-0.986 g/cm3), high-viscosity (with kinematic viscosity of 340-580 cSt@50°C) and resinous (with sulfuric acid resins content of up to 72% mass) crude oil. Cyclic steam stimulation of bottom-hole zones and reservoir steaming were the technologies realized to develop the field which is mature now. Two thermal EOR processes had been tested in the field within the period of 2000-2004. One of the said processes involves the use of a gas-liquid heat carrier (gas-steam), the other – a gaseous heat carrier (thermal gas).

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