| Title | Tracer Survey in Svartsengi Field 1984 |
|---|---|
| Authors | Gudmundsson, Jon Steinar; Hauksson, Trausti |
| Year | 1985 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Well Tests; Reservoir Parameters; Iceland; Svartsengi; Enthalpy; Production; Scale; Injection; Tracer; High Temperature Reservoir; Temperature; Porous Media; Silica; Fractures; Calcite |
| Abstract | Iodide and rohdamine WT tracers (350 kg and 37 liters, respectively) were slug injected into a 80°C and 50 kg/s flowing stream of 80 percent geothermal brine and 20 percent condensate mixture, which was injected into one well in a 77 days tracer survey where five production wells were sampled of which one responded within 40 hours later, but the tracer breakthrough curve had such a long tail that it could not be fitted using porous media and fracture flow models (with and without matrix diffusion), and after 700 hours about 15 percent of the iodide tracer had been recovered but less than 0.5 percent of the dye tracer, so it was assumed lost in the liquid dominated reservoir (100 m drawdown has occurred after 30 billion kg fluid production), which is most likely in two main sectors as a result of subsurface faulting; silica deposition from the brine condensate mixture must be eliminated before long term injection is possible. |