Evaluation of the effectiveness of the CO2-EOR method for enhanced oil recovery in the offshore Sakhalin Island field

Relevance. The need to reduce greenhouse gas emissions into the atmosphere. The introduction and optimisation of technologies to reduce carbon footprints can be a major industry initiative to address climate change. One of the most promising technologies in the oil and gas industry is the use of carbon dioxide for enhanced oil recovery. This technology allows CO2 to be used efficiently, reducing its concentration in the atmosphere while increasing oil production. Aim. Evaluation of the effectiveness of carbon dioxide injection as a method of enhanced oil recovery in Field X offshore Sakhalin Island. Methods. Mathematical modelling, statistical methods. As part of our study, data on CO2 EOR projects were collected from various public sources to form the basis of the analysis. Based on this data, a multivariate linear regression model was developed. Statistical methods including residual analysis and coefficient significance tests were used to verify the accuracy of the model. The validated model was used to estimate the CO2 EOR potential on the shelf of the Sea of Okhotsk. Results and conclusions. Using the developed calculation model, the influence of key parameters of the regression model on the efficiency of CO2-EOR technology was analysed. The model showed a high level of explanatory power, which was confirmed by the values of the coefficients of determination. The results showed high significance of most of the variables considered and confirmed the potential of CO2-EOR as an effective tool for achieving environmental and production goals in the oil and gas industry. The potential for enhanced oil recovery at three locations in the X field offshore Sakhalin Island was also evaluated.