Carbon Capture and Storage (CCS), Evaluation of Carbon Dioxide Storage Efficiency at the Western Siberia Field

Measures need to be taken to reduce the amount of carbon dioxide (CO2) in the atmosphere due to climate change around the world. Storing CO2 allows for more efficient carbon management practices. To date, the improvement of technologies for partial replacement of the buffer volume of gas in underground gas storages (UGS) with CO2 and its disposal in a porous medium is an urgent task. Also, partial replacement of buffer gas by CO2 will allow decreasing capital costs for UGS by means of the buffer gas volume decrease. The geological properties of UGS facilities determine the reliability of CO2 capture and storage. The laboratory research stage is a fundamental component of the introduction of technologies. In the article, experiments were carried out on the injection of liquid CO2 into a porous medium, and the processes occurring in the reservoir during the injection and storage of CO2 were studied. The effect of liquid CO2 on the mineral composition and reservoir properties of core samples was evaluated. The complex of filtration studies consisted of experiments on single-core samples of the target reservoir bed. The assessment of the impact of liquid CO2 injection and holding at 7 days was carried out on core samples with residual water saturation in reservoir conditions. The article presents an analysis of the effect of liquid CO2 on the mineral and reservoir properties of the core. On the basis of the research carried out, technical solutions were obtained for the efficient use of UGS facilities for CO2 storage in Western Siberia.