Volume 56

Temperature-Pressure and Phase Change of Impure Carbon Dioxide in Wellbore Ling Liu, Longxiang Lu, Yongqiang Ren, Chao Zhang, Fang Yu

Abstract

During the process of carbon dioxide sequestration in saline aquifers, the presence of impurities in the gas source significantly impacts the temperature and pressure distribution as well as the phase state of the fluid within the wellbore, thereby influencing the injection conditions and geological storage properties. This study established a coupled temperature-pressure model to explore the phase change mechanism of non-pure carbon dioxide flowing through a wellbore. Based on field data, a numerical simulation study validated the effectiveness of the model in predicting temperature and pressure distributions of non-pure carbon dioxide along the wellbore, as well as determining its phase transition position, which could provide a crucial theoretical and decision-making support for wellhead injection technology in the sequestration of non-pure carbon dioxide in saline aquifers.

Keywords sequestration in saline aquifers, impure carbon dioxide, temperature-pressure in wellbore, phase change of fluid