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Háskólinn í Reykjavík > Tæknisvið / School of Technology > MEd/MPM/MSc Verkfræðideild (áður Tækni- og verkfræðideild) og íþróttafræðideild -2019 / Department of Engineering (was Dep. of Science and Engineering) >

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  • Titill er á ensku Estimation of sustainable production limit by using lumped parameter and USGS hydrotherm simulation
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  • Útdráttur er á ensku

    Sustainable development studies have been frequently discussed in recent decades. Many modeling methods have been developed to maintain the production and investigate the nature of geothermal reservoir. The objective of this thesis can be summarized by defining sustainable production limits by using time and cost-effective models for given geothermal reservoirs. Lumpfit V3 software which based on nonlinear iterative least squares technique and developed by ISOR has been used to simulate reservoir conditions. USGS Hydrotherm simulations were created using Lumpfit V3 results. The purpose of using software of USGS Hydrotherm is to create the reservoir geometry which is ignored in the first step of Lumpfit V3 and to analyze the response of the reservoir according to the parameters applied. These two software packages were used to investigate the sustainable limit of Munadarnes low temperature geothermal reservoir. In this sense, thermal front velocity modelling of the Munadarnes reservoir was investigated in the previous years as a master thesis assuming that 100% of the injected fluid reaches the production well. In this thesis sustainable production limit of Munadarnes low temperature geothermal reservoir have been investigated. Water level changes, production rates and pressure data for the MN-08 well between 2007 and 2017 were provided for this thesis by Reykjavik Energy. All the lumped tank models have been simulated. Best fitting model and properties of reservoir were found in two tank open model. However, fit that obtained 3 tank closed and 3 tank open models were quite similar the fit that obtained from 2 tanks open model. For this reason, 56 different scenarios were simulated to estimate sustainable production limit of Munadarnes reservoir. Based on Lumpfit V3 result estimated the total area that covered by confined reservoir is 16.1 km2 with average permeability of 1.6 mDarcy. 2-D reservoir modeling of the Munadernes geothermal resource was carried out using software of USGS Hydrotherm and 4 different production limits were simulated for a total of 32 years - with injection and without injection. Based on ground-water flow and heat transport results simulated by USGS Hydrotherm, there was no significant temperature change observed in production well at the end of the simulation period. Overall results showed that changes in water levels have a significant impact on the determination of the sustainable limit of the Munadarnes low temperature geothermal reservoir.

  • 29.6.2018

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