Experimental Study on Temperature Drop Characteristics of Supercritical CO2 Leakage on Offshore Platform
Relying on offshore platforms to inject supercritical CO2 back into the seabed saline layer is a key step in offshore CCUS.Supercritical CO2 leakage can easily form a low-temperature area in a short time,posing a threat to the operation of surrounding oil and gas facilities and the safety and health of workers.This paper takes the Enping 15-1 offshore platform as the research object and studies the characteristics and distribution of ambient temperature drop after supercritical CO2 leakage under different leakage apertures(0.5 mm,1.6 mm,and 6.2 mm)and leakage directions(vertical,horizontal,and 45 ° upward)by building a small-sized platform and using a similar model experimental method.The research found that the lowest temperature and biggest temperature appears next to the leakage point,the further leakage point,the higher temperature and smaller temperature drop,the larger the leakage diameter,the lower temperature and the greater the temperature drop with the same original pressure and temperature.No matter the size of hole diameter,the order of temperature drops from high to low is the horizontal,the 45° upward,and the vertical.
Offshore platformSupercritical CO2Small diameter leakageLeakage directionTemperature drop feature
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