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In the last few years the research on efficiency of nonstationary treatment technology has been conducted at high-viscosity index oil field of Severnye Buzachi (Republic of Kazakh). The obtained results reveal that the technology of non-stationary flooding is efficient when developing reservoirs with high-viscosity index oil. However, in order to maintain permanent high technological efficiency it is necessary to modify the technology of non-stationary treatment continually since this technology has such characteristic feature as quick "ageing". The further investigation into the issue how to apply the technology of non-stationary flooding efficiently can be carried out in two directions: to use non-stationary flooding for new pools with different porosity and permeability properties as well as to vary technological parameters of non-stationary flooding (including combination with other technologies) at sites where this technology has already been applied. At the deposit of Severnye Buzachi both approaches are used. Positive experience of applying the technology of non-stationary flooding in combination with the technology of changing filtration flow direction at the pool of the seventh block of the deposit of Severnye Buzachi allows us to recommend using this technology for new pools.