Viðburðir eftir árum


Doktorsvörn - María S. Guðjónsdóttir

Hlutlektir í jarðhitakerfum - Assessing relative permeabilities in geothermal reservoirs using theoretical relations, laboratory measurements and field data

  • 19.11.2015, 10:00 - 12:00
María S. Guðjónsdóttir mun verja doktorsritgerð sína "Hlutlektir í jarðhitakerfum - 

Assessing relative permeabilities in geothermal reservoirs using theoretical relations, laboratory measurements and field data"  fimmtudaginn 19. nóvember kl. 10 í stofu M208.

Leiðbeinendur: 

Guðrún Sævarsdóttir, HR og Halldór Pálsson, HÍ
Andmælendur: 
Stefan Finsterle, Lawrence Berkeley National Laboratory og Ronny Pini, Imperial College

Nefnd: Guðrún Sævarsdóttir, Halldór Pálsson, Jónas Elíasson og Guðni Axelsson

Verkefni þetta er unnið í samstarfi Háskólans í Reykjavík og Háskóla Íslands. Að lokinni vörn mun kandídatinn útskrifast með sameiginlega gráðu frá báðum skólum.

Abstract:

Liquid dominated reservoirs are a common type of hydrothermal reservoirs. They consist of fractured rock and reservoir fluid which may obey Darcy's law. Steam can form in such reservoirs either through heat input which causes temperature increase or through pressure reduction which causes flashing of the fluid. The modified Darcy's law for two phase reservoirs uses relative permeabilities to account for the area reduction of the phases. Darcy's law was used in this thesis to calculate the relative permeabilities for a fluid which flashes in a hydrothermal reservoir and a comparison was made for two flow cases, horizontal and vertical flow. The results show that there is a significant difference in the relative permeabilities between the two flow cases although they share identical transport and thermodynamic properties. This effect of gravity on the relative permeabilities was also observed when measurements were made using water and air as the two phases. Laboratory measurements were also performed to calculate the relative permeabilities of water and steam of geothermal origin. The resulting relative permeabilities showed a tendency to follow the Corey curve to some extent. The so called Shinohara method was used on data from two phase geothermal wells to calculate the relative permeabilities in the reservoirs. The reservoirs consist of a fractured medium rather than porous and the relative permeabilities there show less interaction than in the experiments. The results are an important contribution to understanding the behaviour of two phase flow through a geothermal reservoir. They can be used for geothermal modelling, thus contributing to more detailed modelling of geothermal reservoirs.




Vinsamlegast athugið að á viðburðum Háskólans í Reykjavík (HR) eru teknar ljósmyndir og myndbönd sem notuð eru í markaðsstarfi HR. Hægt er að nálgast frekari upplýsingar á ru.is eða með því að senda tölvupóst á netfangið: personuvernd@ru.is
//
Please note that at events hosted at Reykjavik University (RU), photographs and videos are taken which might be used for RU marketing purposes. Read more about this on our ru.is or send an e-mail: personuvernd@ru.is