Journal
PROCESSES
Volume 9, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/pr9122164
Keywords
wellbore temperature; CO2 fracturing; phase transition; supercritical CO2; CO2 flow
Categories
Funding
- National Natural Science Foundation of China [51779243]
- Strategic Priority Research Program of the Chinese Academy of Science [XDB22030101]
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A transient model using the finite difference method to simulate temperature and pressure in CO2 injection wells is proposed. The maximum error between simulated and measured results is 5.04%. The phase state is primarily controlled by the wellbore temperature, and increasing injection temperature or decreasing injection rate can help achieve the supercritical state.
A transient model to simulate the temperature and pressure in CO2 injection wells is proposed and solved using the finite difference method. The model couples the variability of CO2 properties and conservation laws. The maximum error between the simulated and measured results is 5.04%. The case study shows that the phase state is primarily controlled by the wellbore temperature. Increasing the injection temperature or decreasing the injection rate contributes to obtaining the supercritical state. The variability of density can be ignored when the injection rate is low, but for a high injection rate, ignoring this may cause considerable errors in pressure profiles.
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