In recent years,with the application of CO2 tertiary oil recovery technology in Jiangsu Oilfield,the phenomena of casing deformation and wrong breakage caused by CO2 corrosion have often occurred.Through the research of CO2 well control,fishing,leakage finding and casing tieback and other technologies,a series of CO2 well workover characteristics supporting technology has been formed,and these technologies have been applied in 49 wells on site with a success rate of 94%,which has good prospects for popularization and application.
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