Experimental evaluation of the efficiency of CO2 injection into a low-permeability reservoir

UDK: 622.276.43:661.97

DOI: 10.24887/0028-2448-2025-9-56-60

Key words: CO2 injection, low-permeability reservoir, experimental studies, PVT studies, minimum mixing pressure, filtration studies, asphalt-resin-paraffin deposits, corrosion

Authors: O.A. Morozyuk1,2 (RN-Geology Research Development LLC, RF, Tyumen; Industrial University of Tyumen, RF, Tyumen); S.A. Zanochuev (RN-Geology Research Development LLC, RF, Tyumen); A.V. Polyakov (RN-Geology Research Development LLC, RF, Tyumen); S.S. Magdenko (RN-Geology Research Development LLC, RF, Tyumen); N.G. Belenkova (RN-Geology Research Development LLC, RF, Tyumen); A.A. Zagorovsky (RN-Geology Research Development LLC, RF, Tyumen); A.S. Komisarenko (RN-Geology Research Development LLC, RF, Tyumen); I.V. Novosadova (RN-Geology Research Development LLC, RF, Tyumen); R.S. Shulga (RN-Geology Research Development LLC, RF, Tyumen); M.F. Serkin (RN-Geology Research Development LLC, RF, Tyumen); G.A. Schutsky (RN-Yuganskneftegaz LLC, RF, Nefteyugansk); M.G. Bystrichenko (RN-Yuganskneftegaz LLC, RF, Nefteyugansk)

Field implementation of projects of CO2 injecting into productive formations for enhanced oil recovery is possible only after scientific research and a feasibility study. The key stage of the research is laboratory studies, during which a qualitative assessment of the effectiveness of CO2 injection in the conditions of a potential facility is performed, key parameters are determined for creating a composite model and further modeling of CO2 injection on the scale of a well/pilot site. The parameters for the design of experimental and industrial works are determined. Laboratory studies are performed in conditions close to the reservoir, using reservoir fluids and rock samples of the studied object. This ensures that the profitability of project implementation is assessed as correctly and accurately as possible. The article presents the results of complex laboratory studies carried out as part of the scientific support of a project to implement the CO2 injection into low-permeability reservoirs. The following was performed for the conditions of one of the deposits in Western Siberia: standard and special complex of PVT studies, assessment of the minimum pressure of miscibility, filtration studies on core material. The main negative factors that may occur during the CO2 injection were studied. Based on the experimental data obtained, a composite hydrodynamic model of the experimental site was created, and it is planned to perform multivariate calculations on the scale of the well/site of the studied object.

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