scholarly journals Engineered Geothermal System Demonstration Project

2014 ◽  
Author(s):  
Susan Petty
Keyword(s):  
Demonstration Project ◽  
Geothermal System ◽  
Engineered Geothermal System

scholarly journals Natural State Modeling of Singapore Geothermal Reservoir

2012 ◽  
Vol 3 ◽  
pp. 34-40
Author(s):  
Hendrik Tjiawi ◽  
Andrew C. Palmer ◽  
Grahame J. H. Oliver
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
High Heat ◽  
Hot Water ◽  
Geothermal Reservoir ◽  
Natural State ◽  
Geothermal System ◽  
Fuel Price ◽  
The Cost ◽  
Engineered Geothermal System

 The existence of hot springs coupled with the apparent anomalous high heat flow has sparked interest in the potential for geothermal development in Singapore. This geothermal resource may be potentially significant and could be exploited through Engineered Geothermal System (EGS) technology, i.e. a method to create artificial permeability at depth in granitic or sandstone formations as found under Singapore. The apparently ever-increasing fossil fuel price has made the cost of using the EGS technology more viable than it was in the past. Thus, to assess the resource, a numerical model for the geothermal reservoir has been constructed. Mass and heat flows in the system are simulated in 2D with AUTOUGH2.2, and the graphical interface processed through MULGRAPH2.2. Natural state calibration was performed to match both the observed and the expected groundwater profile, and also to match the hot water upflow at the Sembawang hot spring, with simulated flowrate matching the hot spring natural flowrate. The simulation gives an encouraging result of 125 - 150 °C hot water at depth 1.25 – 2.75 km.

The Impacts of Different CO2 Injection Temperature on Heat Extraction Rate in CO2-EGS Based on CCS Demonstration Project

2012 ◽  
Vol 588-589 ◽  
pp. 21-26 ◽  
Author(s):  
Jin Na ◽  
Fu Gang Wang ◽  
Yan Shi ◽  
Zhi Min Cai
Keyword(s):  
Numerical Models ◽  
Extraction Rate ◽  
Demonstration Project ◽  
Heat Extraction ◽  
Geothermal System ◽  
Water Displacement ◽  
Operation Period ◽  
Injection Temperature ◽  
And Storage ◽  
Heat Extraction Rate

In this paper we use Majiagou geologic formation in Erdos Carbon Caputure and Storage(CCS) demonstration project aera as artificial geothermal reservoir, and create numerical models of Enhanced Geothermal System(EGS) using CO2 as a heat transfer carrier. In order to analyze the impacts of CO2 injection temperatures on heat extraction rate and the sustainability of CO2-EGS, five cases with different CO2 injection temperature are designed. Simulation results show that the range of the average heat extraction rate of case 1～5 is 6.56～8.47MW in the whole CO2-EGS operation period. The heat extraction rates vary over time, And it is 6.37～7.9MW in CO2 and water displacement stage and 6.64～8.68MW after aqueous phase dispear respectively. Injection temperature of CO2 significantly impacts the heat extraction rate of EGS .

scholarly journals Analysis of Hydraulic Fracturing and Reservoir Performance in Enhanced Geothermal Systems

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Mengying Li ◽  
Noam Lior
Keyword(s):  
Hydraulic Fracturing ◽  
Flow Direction ◽  
Fractured Reservoirs ◽  
Geothermal System ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Fracture Width ◽  
Reservoir Performance ◽  
Flow And Heat Transfer ◽  
Engineered Geothermal System

Analyses of fracturing and thermal performance of fractured reservoirs in engineered geothermal system (EGS) are extended from a depth of 5 km to 10 km, and models for flow and heat transfer in EGS are improved. Effects of the geofluid flow direction choice, distance between fractures, fracture width, permeability, radius, and number of fractures, on reservoir heat drawdown time are computed. The number of fractures and fracture radius for desired reservoir thermal drawdown rates are recommended. A simplified model for reservoir hydraulic fracturing energy consumption is developed, indicating it to be 51.8–99.6 MJ per m3 fracture for depths of 5–10 km.

scholarly journals The Northwest Geysers Enhanced Geothermal System Demonstration Project, The Geysers, California. Final Report

2019 ◽  
Author(s):  
Craig Hartline ◽  
Mark Walters ◽  
Melinda Wright ◽  
Chakra Rawal ◽  
Julio Garcia ◽  
...  
Keyword(s):  
Demonstration Project ◽  
Geothermal System ◽  
Final Report ◽  
Enhanced Geothermal System ◽  
The Geysers

scholarly journals Audible acoustics from low-magnitude fluid-induced earthquakes in Finland

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Oliver D. Lamb ◽  
Jonathan M. Lees ◽  
Peter E. Malin ◽  
Tero Saarno
Keyword(s):  
Low Frequency ◽  
Acoustic Signals ◽  
Body Waves ◽  
Microphone Arrays ◽  
Geothermal System ◽  
Induced Earthquakes ◽  
Acoustic Coupling ◽  
Helsinki Metropolitan Area ◽  
System Project ◽  
Engineered Geothermal System

AbstractEarthquakes are frequently accompanied by public reports of audible low-frequency noises. In 2018, public reports of booms or thunder-like noises were linked to induced earthquakes during an Engineered Geothermal System project in the Helsinki Metropolitan area. In response, two microphone arrays were deployed to record and study these acoustic signals while stimulation at the drill site continued. During the 11 day deployment, we find 39 earthquakes accompanied by possible atmospheric acoustic signals. Moment magnitudes of these events ranged from $$-0.07$$ - 0.07 to 1.87 with located depths of 4.8–6.5 km. Analysis of the largest event revealed a broadband frequency content, including in the audible range, and high apparent velocities across the arrays. We conclude that the audible noises were generated by local ground reverberation during the arrival of seismic body waves. The inclusion of acoustic monitoring at future geothermal development projects will be beneficial for studying seismic-to-acoustic coupling during sequences of induced earthquakes.

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