The wellbore flow of supercritical CO₂ in a horizontally eccentric annulus

The analysis of the wellbore flow field of supercritical CO 2 is the basis for its use in oil and gas reservoir development. Considering the coupling relationship between the pressure and temperature of the flow field and the physical property parameters of CO 2 , a calculation model of CO 2 flow in the horizontal eccentric annular air was established, and the influence of displacement and annular eccentricity on the flow field characteristics was simulated and analyzed. Based on the vortex viscosity theory, the internal relationship between friction and turbulent kinetic energy and flow pressure loss is revealed through the in-depth analysis of the internal mechanism of eccentricity, displacement, inlet temperature, and outlet back pressure affecting flow pressure loss. The results show that the flow friction is more influential than turbulent kinetic energy in the variation of flow pressure loss; the loss of flow pressure increases with the increasing displacement and pressure and decreases with the temperature rise, and the flow pressure loss increases firstly and then decreases with the increasing eccentricity, and the critical eccentricity is 0.8.