The thesis examines the problem of using retired offshore gas and oil pipelines for further use in the carbon dioxide utilization program. The relevance lies in the general direction of energy industry development associated with the transition to ecologically clean fuels. The aim of the work is to determine if it is possible to convert pipelines for feedstock re-injection under given infrastructure parameters. The assessment was carried out by numerical modelling using industry software and solving analytical solid mechanics equations. A comprehensive analysis of the component composition of the separated carbon dioxide from the hydrogen production unit was carried out using three separation technologies as examples. The behavior of the fluid along the pipeline route with the determination of the required pressure and temperature for supercritical pumping was studied using different software packages. Various schemes are considered for the analysis of the stability of a pipeline structure when laid in a trench with backfill, taking into account the worst variant of loss of stability due to a load-bearing capacity failure of the soil. The analysis of corrosion deterioration in emergency situations, together with the environmental impact assessment, made it possible to verify the safety of the project. The results suggest the feasibility of such projects and complement existing industry guidelines on transition procedures. Based on existing recommendations and normative documents, together with calculations and modeling, a new detailed algorithm was developed to assess the possibility of reorienting pipelines. This algorithm can be applied to develop future projects.