Research and application of CO2 self-healing anti-corrosive cementing slurry system
In response to the problem of difficulty about maintaining the long-term integrity of cement stone in CCUS,a CO2 self-healing anti-corrosive cementing slurry system has been constructed.This system introduced self-healing materials and anti-corrosion materials,combined with other additives to form a cement slurry system with the density of 1.9 g/cm3.The self-healing cementing slurry system has good conventional performance and can meet the requirements of cementing construction.The corrosion resistance and self-healing perfor-mance of the slurry system were studied.The research results showed that the corrosion depth of cement stone after CO2 corrosion for 30 days was less than 1.00 mm,and the com-pressive strength was enhanced after CO2 corrosion.After 30 days of corrosion,the relative increase percentage of compressive strength of self-healing cement stone for joint making is 149.30%.After 12 and 24 hours of corrosion,the self repair rates of cement stone were 97.64%and 97.97%,respectively.In this article,the self-healing anti-corrosive cementing slurry system constructed can effectively promote the development of CCUS technology and assist in the storage of CO2 for hundred years.
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