Temperature and pressure analysis of wells NJ-13 and NJ-28 in the Nesjavellir geothermal system, SW-Iceland

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dc.contributor Jarðhitaskóli Háskóla Sameinuðu þjóðanna is
dc.contributor.author Otmar, Aloysius Tunu is
dc.date.accessioned 2016-10-05T09:48:52Z
dc.date.available 2016-10-05T09:48:52Z
dc.date.issued 2016
dc.identifier.issn 1670-7427
dc.identifier.uri http://hdl.handle.net/10802/11634
dc.description Í: Geothermal training in Iceland 2015, bls. 641-664 is
dc.description.abstract Temperature and pressure analysis of geothermal wells is one of the vital steps in evaluating a geothermal reservoir during exploration, production and monitoring the wells. By analysing temperature and pressure logs from the warm up period of a well, the formation temperature and initial pressure can be deduced. Injection well testing is usually done at the end of drilling to find out physical parameters of the well and the reservoir surrounding it and get information on the connection of the well to the reservoir. Well NJ-13 is a 1609 m deep vertical production well drilled in 1985. It is located in the Nesjavellir high-temperature geothermal field of the Hengill geothermal system located in SW-Iceland. The total enthalpy of well NJ-13 is around 2500 kJ/kg. At well head pressure (P0) of 16 bar-g, the power output for well NJ-13 is 15 MWe, as estimated from the original production test data. Well NJ-28 is a directional well drilled from the same well pad as NJ-13 in MayJune 2015 as a makeup well to a depth of 1301 m with respect to the platform. The intended depth of this well was 2100 m but the drilling was stopped at 1301 m after several attempts to continue when the drill string repeatedly got stuck due to intrusions at the bottom of the well. The total enthalpy of well NJ-28 is around 2600 kJ/kg. At a well head pressure (P0) of 20 bar-g, the power output of well NJ-28 is 5 MWe estimated from production test data from September 2015. Well NJ-28 has lower transmissivity and injectivity than well NJ-13 which might explain why NJ-28 is a poor producer compared to NJ-13. is
dc.format.extent 24 bls. is
dc.language.iso en
dc.relation.ispartofseries United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 2015 : 29
dc.relation.uri http://os.is/gogn/unu-gtp-report/UNU-GTP-2015-29.pdf
dc.subject Jarðhiti is
dc.subject Borholur is
dc.subject Nesjavellir is
dc.subject NJ-28 (borhola) is
dc.title Temperature and pressure analysis of wells NJ-13 and NJ-28 in the Nesjavellir geothermal system, SW-Iceland en
dc.title.alternative Geothermal training in Iceland en
dc.type Tímaritsgrein is
dc.identifier.gegnir 001437110


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