{"id":{"repo_id":"reykjavik","oai_identifier":"oai:skemman.is:1946/44885"},"canonical_url":"https://search.dev.ndltd.org/etd/reykjavik/oai:skemman.is:1946/44885","repository":{"repo_id":"reykjavik","name":"Reykjavík University","base_url":"https://skemman.is/oai/request"},"display":{"title":"Geoejector : extracting geothermal fluid from a low-pressure geothermal well","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Jeffrey Macatangay Andal 1993-"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Háskólinn í Reykjavík"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-06-08T13:05:47Z","date_published":"2023-06-08T13:05:47Z","updated_at":"2026-07-27T20:40:29Z","subjects":["Orkuverkfræði","Meistaraprófsritgerðir","Jarðhiti","Borholur","Jarðhitavatn","Þrýstingur","Dælur","Raforkuframleiðsla","Sustainable energy engineering","Geothermal resources","Geothermal wells","Water","Steam-heating, Low pressure","Steam - High pressure","Ejector pumps","Electric power production"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1946/44885","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Háskólinn í Reykjavík"]},{"key":"dc:creator","label":"Author","values":["Jeffrey Macatangay Andal 1993-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2023-06-08T13:05:46Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2023-06-08T13:05:46Z"]},{"key":"dc:date.issued","label":"Date","values":["2023-06-08T13:05:47Z"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Orkuverkfræði","Meistaraprófsritgerðir","Jarðhiti","Borholur","Jarðhitavatn","Þrýstingur","Dælur","Raforkuframleiðsla","Sustainable energy engineering","Geothermal resources","Geothermal wells","Water","Steam-heating, Low pressure","Steam - High pressure","Ejector pumps","Electric power production"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1946/44885"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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.","Til að nýta lágþrýsta og lágvermis gufuborholu var settur upp jektor með vökvahraða undir hljóðhraða (kallaður subsonic geoejector) og hann prófaður á Þeistareykjum á árunum 2020 og 2021. Kerfið tengdi lágþrýsta jarðhitaholu við nærliggjandi háþrýstiholu til að framkalla flæði úr lágþrýstiholunni við annars óhagstæðan bakþrýsting. Jektorinn er sambærilegur við jektora sem notaðir eru í ýmsum atvinnugreinum. Ólíkt hefðbundnum jektorum, er mikil áskorun fólgin í því að tveggja fasa jarðhitavökvi streymir um hann og innstreymið er mjög breytilegt. Út frá greiningu með analýtísku og tölulegu líkani af jektornum með vökvarennsli undir hljóðhraða kom í ljós að hann getur ekki hraðað háþrýstivökvanum nógu mikið til að búa til undirþrýsting til þess að viðhalda flæði frá lágþrýstiholunni við raunverulegar rekstraraðstæður. Til að bregðast við þessu vandamáli mun þessi grein kynna jektor með vökvarennsli yfir hljóðhraða (e. supersonic geoejector), sem var hannaður til að uppfylla rekstrarþörf fyrir orkuframleiðslu og greindur með analýtísku og tölulegu líkani. Niðurstaða líkansins lofar góðu og bendir til að nýja uppsetningin gæti aukið þrýsting jarðhitavökva úr lágþrýstiholu um 2,4 bör, sem myndi bæta við allt að 0,8 MWe í raforkuframleiðslu."]},{"key":"dc:title","label":"Title","values":["Geoejector : extracting geothermal fluid from a low-pressure geothermal well"]}]}],"canonical_facts":{"dc:contributor":["Háskólinn í Reykjavík"],"dc:creator":["Jeffrey Macatangay Andal 1993-"],"dc:date.accessioned":["2023-06-08T13:05:46Z"],"dc:date.available":["2023-06-08T13:05:46Z"],"dc:date.issued":["2023-06-08T13:05:47Z"],"dc:description.abstract":["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.","Til að nýta lágþrýsta og lágvermis gufuborholu var settur upp jektor með vökvahraða undir hljóðhraða (kallaður subsonic geoejector) og hann prófaður á Þeistareykjum á árunum 2020 og 2021. Kerfið tengdi lágþrýsta jarðhitaholu við nærliggjandi háþrýstiholu til að framkalla flæði úr lágþrýstiholunni við annars óhagstæðan bakþrýsting. Jektorinn er sambærilegur við jektora sem notaðir eru í ýmsum atvinnugreinum. Ólíkt hefðbundnum jektorum, er mikil áskorun fólgin í því að tveggja fasa jarðhitavökvi streymir um hann og innstreymið er mjög breytilegt. Út frá greiningu með analýtísku og tölulegu líkani af jektornum með vökvarennsli undir hljóðhraða kom í ljós að hann getur ekki hraðað háþrýstivökvanum nógu mikið til að búa til undirþrýsting til þess að viðhalda flæði frá lágþrýstiholunni við raunverulegar rekstraraðstæður. Til að bregðast við þessu vandamáli mun þessi grein kynna jektor með vökvarennsli yfir hljóðhraða (e. supersonic geoejector), sem var hannaður til að uppfylla rekstrarþörf fyrir orkuframleiðslu og greindur með analýtísku og tölulegu líkani. Niðurstaða líkansins lofar góðu og bendir til að nýja uppsetningin gæti aukið þrýsting jarðhitavökva úr lágþrýstiholu um 2,4 bör, sem myndi bæta við allt að 0,8 MWe í raforkuframleiðslu."],"dc:identifier.uri":["http://hdl.handle.net/1946/44885"],"dc:language.iso":["en"],"dc:subject":["Orkuverkfræði","Meistaraprófsritgerðir","Jarðhiti","Borholur","Jarðhitavatn","Þrýstingur","Dælur","Raforkuframleiðsla","Sustainable energy engineering","Geothermal resources","Geothermal wells","Water","Steam-heating, Low pressure","Steam - High pressure","Ejector pumps","Electric power production"],"dc:title":["Geoejector : extracting geothermal fluid from a low-pressure geothermal well"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:40:29Z"}