TY  - JOUR
AU  - WEI, Juyan
AU  - FU, Meilong
AU  - FANG, Li
AU  - LI, Xudong
PY  - 2025
TI  - Numerical simulation of operating parameters of CO2 plume geothermal system in high temperature gas field
JO  - Journal of Northwest University (Natural Science Edition)
SN  - 1000-274X
SP  - 1065
EP  - 1073
VL  - 55
IS  - 5
AB  - Aiming at the extraction of geothermal resources from high-temperature waste gas reservoirs, the article takes a high-temperature gas field as the target thermal storage, establishes a well-storage fully coupled model with CO2 as the working fluid through COMSOL software, analyses the thermosiphon effect, changes the CO2 circulation rate and the diameter of the wellbore respectively, and observes the pressure changes in the injection wells and the production wells, as well as researches the influence of the system operation parameters on the performance of the heat extraction. The study shows that the CO2 circulation rate has a significant effect on the thermosiphon effect, with smaller wellbore diameters producing a stronger thermosiphon effect. Higher injection temperatures result in a slow decline in the temperature of the production fluid in the later stages of system operation, along with a lower rate of system heat recovery. Larger injection flow rate leads to a rapid decrease in the temperature of the producing fluid. Larger injection and extraction well spacing reduces the fluctuation amplitude of the temperature of the producing fluid and increases the time of the stabilisation phase of the heat recovery rate. The study provides reference significance for the future CO2-plume geothermal system to carry out deep geothermal energy extraction.
UR  - https://doi.org/10.16152/j.cnki.xdxbzr.2025-05-010
DO  - 10.16152/j.cnki.xdxbzr.2025-05-010