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With the question of reliability on the results of standard and SCAL tests on carbonate cores of the Central Khoreiver Uplift (CKU) reservoirs, a study was carried out to develop appropriate core preparation techniques for the rock. Several tests were carried out on core plugs with cleaning agents like: alcohol-benzene, toluene, chloroform, carbon tetrachloride in the Soxhlet apparatus, cold kerosene in centrifuge and hot kerosene in coreholder. Cleaning effects on porosity, gas permeability, wettability, irreducible water saturation were studied. The influence of each agent on basic core properties is shown. Based on the various cleaning techniques available and the results achieved, the most suitable cleaning method for CKU carbonates was recommended. Core aging techniques with dead oil at reservoir temperature and set pressure were carried out. Single aging and sequential multi aging at different aging periods and their effects on core properties were shown. Core preparation techniques, uncleaned core tests evaluation, aging methods and further studies were also recommended.

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Background. The article considers and justifies the need to take into account the indicators that characterize the amount of balance reserves involved in the development, as well as the increase in recoverable oil reserves due to EOR, when evaluating the technological efficiency of the treatment of the alignment of the pick-up profile (RUNWAY). Aim. If the increase in recoverable reserves is significantly less than production, this will lead to a loss of oil production potential. This fact is of particular importance in the conditions of the arrangement of the old squares and the presence of a developed infrastructure on them. Materials and methods. Materials were used to assess the dynamics and degree of development of oil reserves, calculations of the increase in recoverable reserves. Results. The article presents the results of the accumulated technological efficiency of work to improve oil recovery using various technologies for leveling the intake profile (runway) and non-stationary flooding at the facilities of Subsurface user in Khanty-Mansi Autonomous Area – Yugra on the basis of system-targeted impact on the reservoir. The article also presents materials on the assessment of the dynamics and degree of development of oil reserves, as well as calculations of the increase in recoverable reserves. Conclusions. Calculations based on the assessment of the increase in initial and residual recoverable oil reserves from the implementation of annual EOR programs carried out in accordance with the methodology of PJSC Gazpromneft indicate that the implementation of these programs contributes to additional involvement in the active development of previously poorly drained or non-drained oil reserves.