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• W2023880051 abstract "Predicting deposition rates of dissolved silica in geothermal reinjection aquifers is difficult due to a lack of reliable scaling rates and the complexity of modelling fluid transport simultaneously with deposition. In order to develop techniques, understand the problems and improve our predictive capabilities, we have undertaken field experiments at Wairakei geothermal field, New Zealand, to determine amorphous silica deposition rates in 25 mm diameter pipes packed with 2 mm diameter zirconia beads. These pipes served as model aquifers. Five experiments using flashed fluid containing 530 ppm total silica were completed at temperatures between 71 and 129°C and at flowrates between 0.002 and 0.02 kg s−1. The residence times in the pipes were shorter than the induction period required for silica polymerisation from solution. The scaling rates in the beds, measured over a month, were about 12 mg cm−2 year−1 and independent of flowrate between 80 and 129°C. Scaling at 129°C was unexpected, because the dissolved silica was expected to be undersaturated with respect to amorphous silica. At 71°C the rates were higher (up to 23 mg cm−2 year−1) and were proportional to flowrate. At Wairakei the 130°C fluid used in these experiments is disposed of by injection into a reservoir at 80°C. Using our field deposition rates, we estimate that 2.6×105 kg of amorphous silica would precipitate in 10 years around the injection well, assuming an injection rate of 50 kg s−1 into a 100 m thick reservoir of radius 500 m with permeability 100 mdarcy and a porosity of 0.2." @default.
• W2023880051 created "2016-06-24" @default.
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• W2023880051 date "2000-12-01" @default.
• W2023880051 modified "2023-09-23" @default.
• W2023880051 title "Deposition of amorphous silica in porous packed beds — predicting the lifetime of reinjection aquifers" @default.
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• W2023880051 doi "https://doi.org/10.1016/s0375-6505(00)00027-4" @default.
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