Self-Healing, Re-adhering, and Corrosion-Mitigating Inorganic Cement Composites for Geothermal Wells at 270°-300°C: Final Report
Under the DOE EERE Geothermal Technologies Office (GTO)-funding project in FY 2016- 2018, the scope of work at Brookhaven National Laboratory (BNL) aimed 1) to conduct the screening of qualified candidates for self-healing cement composites reinforced with microcarbon fiber (MCF), 2) to obtain the fundamental understanding of self-healing mechanism, to develop self-healing aides, 3) to evaluate re-adhering performance of debonded self-healing composites to carbon steel (CS) casing or granite rock formation, 4) to evaluate bond durability of composite/CS joint in acid and thermal shock environments, 5) to assess the corrosion mitigation of CS by composites adhering and re-adhering to CS surfaces, and 6) to investigate the maintenance of pumpability at 85° and 100°C of optimized composite slurry as well as to evaluate self-healing and re-adhering ability of pumpable composite formulation at hydrothermal temperatures, ranging from 270° to 300°C. In this work, three different cementitious material groups, 1) Ordinary Portland Cement (OPC)-based cements, 2) alkali (sodium metasilicate, SMS)-activated cements, and 3) phosphate (sodium hexametaphosphate, SHMP)-bonded cements, were evaluated to meet the following ten material criteria suitable for inorganic cement composites in six different environments, the plain water, alkali carbonate, geo-brine, thermal shock, pH 0.6 H2SO4/brine, and pH 5.5 scCO2/brine.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
- DOE Contract Number:
- SC0012704; AC-02-98CH 10886
- OSTI ID:
- 1501577
- Report Number(s):
- BNL-211405-2019-INRE
- Country of Publication:
- United States
- Language:
- English
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