Corrosion of Cement Grouts in Aggressive Geothermal Fluids
- Key words
- Production; Drilling; Brine Technology; New Zealand; Ohaaki; Corrosion; Grout; C02; CaC02; Silica
- Location
- Ohaaki, New Zealand; Taupo Volcanic Zone
- Conference
- Geothermal Resources Council Transactions
- Year
- 1990
- Session
- Cementing; Corrosion; Well casing; Durability testing; Carbo
- Language
- English
Abstract
At the Ohaaki geothermal field, New Zealand, severe corrosion of both well casings and cement grout has occurred. The corrosion is caused by water with high carbon dioxide content lying above the production zone. Initially, the cement grout is carbonated and then the carbonation product is slowly dissolved by the acid waters. The most severe corrosion occurs with grout formulations which contain additions of silica flour, the additive normally used to prevent strength regression. Grouts which are most resistant to corrosion are those which contain high Ca (OH) 2 contents.
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