Application of pump-ejecting system for SWAG injection and utilization of associated gas

The work provides an analysis of the operating experience of the pump-ejecting system for simultaneous water and gas injection (SWAG) injection, at the Samodurovsky field of Orenburgneft PJSC. The results of earlier theoretical and experimental studies were confirmed. The pump-ejecting system worked stably in various modes; there were no disruptions in the supply of ejectors and pumps. At the same time, the experience of operating the system made it possible to outline measures to improve not only the equipment, but also the technology of water and gas impact on the formation using pump-ejecting systems. To implement SWAG, it is necessary that the gas content of the mixture in reservoir conditions reach 13-20%. In those cases when the volume of associated petroleum gas (APG) is not offered, it is proposed to use nitrogen. Adding nitrogen as a gas component to the water-gas mixture will help to obtain a mixture with the desired gas content. This solution allows utilizing APG and significantly increasing oil production. © Published under licence by IOP Publishing Ltd.