MSc defence by Jeffrey M. Andal

25 May 2023

Jeffrey M. Andal from the Philippines, MSc Fellow in Sustainable Energy Engineering at Reykjavík University will defend his MSc project on Tuesday 6th of June at 13:00-15:00 at RU in room M208.  

The title of the project is:
Geoejector: Extracting geothermal fluid from a low-pressure geothermal well

Jeffrey's supervisors are:
María Sigríður Guðjónsdóttir, Associate Professor, Reykjavík University
Guðrún Arnbjörg Sævarsdóttir, Professor, Reykjavík University
Egill Juliusson, Chief Technology Officer, Arctic Green Energy Corporation

External examiner is Ásdís Helgadóttir, Associate Professor, University of Iceland

Link to the presentation:

To utilize a low-pressure and low-enthalpy well, a subsonic ejector system (referred to as subsonic geoejector) was developed and tested at the Theistareykir Geothermal Field in 2020 and 2021. The system connected a low-pressure geothermal well to a nearby high-pressure well to induce flow from the low-pressure well under otherwise unfavorable pressure. The subsonic geoejector has similar working principle as an industrial ejector used in many industries. However, unlike traditional ejectors, it is faced with challenges involving two-phase geothermal fluids and highly variable inflow conditions. From analysis with an analytical and numerical model of the subsonic geoejector, it was found that it cannot accelerate the high-pressure fluid enough to create an underpressure that will induce flow from the low-pressure well under real operating conditions. To address this problem, this paper will introduce a supersonic geoejector that was designed to meet the operational requirement for power production and analyzed with an analytical and numerical model. The result of the models are promising, and it is found that the new setup could potentially increase the pressure of geothermal fluid from low-pressure well sufficiently or up to 2.4 bar, which would add up to 0.8 MWe for power generation.