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Under the conditions of high-temperature geothermal wells, the Cement-steel interface is a weak point of cement sheath strength. Portland Cement /SiO 2 blends describe carbon steel adhesion behavior of 300 b0C-autoclaved alkali-activated Calcium-Aluminate-Cement /fly ash F, granulated blast furnace slag /SiO 2, and Ordinary Portland Cement /SiO 2 blends. Sheath underwent catastrophic failure in the first TS cycle, losing 78 percent and TSRC 51% of the bond in 6 cycles; the bond yield in 6 cycles was down by 5 percent. Only TSRC-CS bond survived 30 days of heavy acid exposure; the OPC/SiO 2 bond failed after 18 days, and GBFS/SiO 2 after 20 days. Samples of TSRC-CS cured for 30 days at 300 b0C before the bond strength recovered 49 percent of the damaged bond's strength after additional short-time curing. For OPC/SiO 2 shielded CS, the CS covered by the re-adhered TSRC showed a low corrosion rate of 0. 13 mm/year, 0. 2 mm/year, vs. 0. 64 mm/year.
Source link: https://www.osti.gov/biblio/1767429
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