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• W2183656755 abstract "The Hofsstadir geothermal system, which was discovered during an extensive regional reconnaissance survey in W-Iceland in 1995, is a typical liquid-dominated convective low-temperature system. The entire monitoring data available for the only production well, HO-1, were simulated by lumped parameter modelling. Due to insufficient recharge, a continuous water-level decline -1has been observed. Reinjection started in early 2007 by injecting the return water from the heating system into injection well HO-2. Through simulating various production scenarios, using the best fitting model based on data collected without reinjection, the connection between the two wells was studied. The future water-level changes in the production well were predicted, based on the assumption that a given percentage of the reinjected water could eventually be re-extracted through the production well, without causing additional pressure drop. The calculated results indicate that this system will be able to sustain a 20 l/s average production through 2032, without reinjection. This will require that the down-hole pump in HO-1 be lowered. If reinjection is applied in the long term, then the production capacity of the field can reach up to 30 l/s with minor cooling of the production well. Monte Carlo volumetric assessment was applied to the Hofsstadir field. The results predict with 90% probability that at least 25 MWth can be produced for a production period of 30 years, at least 12 MWth for 60 years and at least 7 MWth for 100 years, based on the area estimate from the lumped parameter model. During the tracer test, which was started on 29-8-2007, a total of 101 hot water samples were collected and analyzed. The data were interpreted using a multiple flow-channel model. The simulations of transport pulses show that there are direct paths between the feed-zones of well HO-2 and those of well HO-1. A future cooling effect due to long term injection within this field was predicated using the same model. Finally, the energy increase, due to the injected water being heated up and re-extracted through the production well, was calculated for the next 30 years, using different assumptions for flow channel models. The results show that largescale cooling is not likely to happen in this field. The injection conditions within this field are optimal and the contribution of reinjection to maintaining the reservoir pressure is quite significant. Through reinjection, the annual energy production of the Hofsstadir geothermal system can be enhanced by approximately 50%." @default.
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• W2183656755 date "2008-01-01" @default.
• W2183656755 modified "2023-09-27" @default.
• W2183656755 title "ASSESSMENT OF THE HOFSSTADIR GEOTHERMAL FIELD, W-ICELAND, BY LUMPED PARAMETER MODELLING, MONTE CARLO SIMULATION AND TRACER TEST ANALYSIS" @default.
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