Atmospheric Environmental Monitoring of CO2 Flooding and Geological Storage Site Based on Navigation Technology
The leakage risk of CO2 flooding and geological storage projects is an important bottleneck restricting their development.Monitoring CO2 in the surface atmosphere is considered to be a key means to prevent the leakage risk and confirm the amount of carbon stored.In this study,CO2 navigation monitoring technology was introduced for the first time.Here,surface CO2 leakage characteristics were monitored in the pilot test area of CO2 miscible-phase flooding in Karamay Oilfield,Xinjiang.The monitoring results showed that the average CO2 concentration of 9 functional blocks in the surrounding administrative regions of the test area was 417.95×10-6～767.59×10-6,and the cleaning background concentration was 416.66×10-6.The hourly concentration change of CO2 in the test area was correlated with the daily schedule of on-site production organization.The average hourly concentration was 416.81 × 10-6～420.69 × 10-6,which had little difference with the background concentration.Therefore,the impact on the atmospheric environment was little.Local abnormal points appeared five types of locations,including gas injection points,oil production wells,on-site rest rooms,well repairing operation site,and living base.In the gas injection system,storage tanks,heat exchanger and injection pumps had obvious detection.The maximum leakage values of 6 groups of gas injection systems were lower than the long-term exposure limit and far lower than the short-term exposure limit of CO2.
navigationcarbon dioxideflooding and storageatmospheric environmentmonitoring
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