oa CO2 Injection Well Modelling of Effects of Impurities and Particles using OLGA

This paper demonstrates how CO2 flow injection with impurities and particles can be effectively modeled in wells using the commercial flow assurance tool OLGA code, which was improved significantly for CO2 two-phase flow applications recently. This code is found to give very good prediction of the CO2 dynamic behavior in the well, including pressure and injectivity. The extensive functionalities in the OLGA code allow to investigate the impact of particle presence in the CO2 steam on their dynamic behavior in the well.

A case study modeling particle flow in CO2 injection through a lazy-wave riser and slanted subsea well was successfully set up and simulated for steady-state and transient conditions. The OLGA particle flow models, both simple and advanced, were discussed. The simulation results show that the presence of particles in CO2 stream will have a significant impact on both temperature and pressure variation at the wellhead during its shut-in operation once CO2 two-phase flow presents in the well. However, due to a lack of reliable experimental data, OLGA’s numerical models for particles smaller than 50 microns are not fully reliable.