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Prediction of Injection Induced Cooling Based on Analysis of Tracer Test Data in the Laugaland Geothermal Field, S-Iceland
Received date: 2004-10-13
Revised date: 2004-12-24
Online published: 2005-11-15
The temperature decline of production wells is a potential problem induced by reinjection.At Laugaland,in order to assess and predict the temperature changes result ing from reinjection,a tracer test was carried out as an effective tool for quantitat ively studying the hydraulic connection between production and injection wells.The analysis of the tracer test data indicates that the connection between the injection well GN-1 and production well LWN-4 is fairly direct.Based on the tracer test,the reinject ion-induced temperature decline of the production well LWN-4 was predicted under different hypotheses and production-reinjection scenarios.The calculated temperature decline is,however,a few degrees greater than the actual cooling observed.The discrepancy is mainly attributed to a drastic change in flow conditions because of reduced production since reinjection started.In addition,the major earthquakes in 2000 may also have influenced the flow-pattern in the reservoir at Laugaland.
Key words： geothermal field; reinjection; tracer test; temperature; Laugaland; Iceland
ZHANG Yuan-Dong , WEI Jia-Hua . Prediction of Injection Induced Cooling Based on Analysis of Tracer Test Data in the Laugaland Geothermal Field, S-Iceland[J]. Journal of University of Chinese Academy of Sciences, 2005 , 22(6) : 761 -766 . DOI: 10.7523/j.issn.2095-6134.2005.6.016
[1] Goyal KP.Inject ion recovery fact ors in various areas of the Southeast Geysers,California.Geothermics,1995,24( 2):167～186.
[2] Stefansson V.Geothermal reinjection experience.Geothermics,1997,26:99～130.
[3] Steingrimsson B,Aunzo Z,Bodvarsson GS,et al.Changes in thermodynamic conditions of the Ahuachapan reservoir due to product ion and inject ion.Geothermics,1991,20( 1P2):23～38.
[4] Axelsson G.Essence of geothermal resource management.In:Fridleifsson IB,Gunnarsson MV( eds.),Lectures on the sust ainable use and operating pol icy for geothermal resources.IGC 2003 short course,UNU G.T.P.,Pub.1,2003,129～151.
[5] Axelsson G,Stefansson V.Reinject ion and geothermal reservoir management associated benefit s.Proceedings of the Int ernational Workshop on Direct Use of Geothermal Energy,Ljubjana,Slovenia,1999,21.
[6] Axelsson G,Gunnlaugsson E.Long t erm monitoring of high-and low-enthalpy fields under exploit ation.WGC 2000 short courses,Kokonoe,Kyushu district,Japan,2000,57～65.
[7] Axelsson G,2003b:Simple modelling of geothermal system,UNU G.T.P.,Iceland,unpublished lecture notes.
[8] Bjornsson G,Axelsson G,Tomasson J,et al.Heating service of Rangaeingar,geothermal explorat ion 1987～1992 and possibil it ies on future energy,Orkustofnun,Reykjavik.report OS-93008PJHD-03 B( in Icelandic),1993,68.
[9] Arason P,Bjornsson G,Axelsson G,et al.The Geothermal Reservoir Engineering S of tware Package Icebox,Orkustofnun,Reykjavik,2003,53.
[10] Bodvarsson GS,Stefansson V.Reinjection into geothermal reservoirs.In:Okandan E( ed),Geothermal Reservoir Engineering.Ankara-Turkey:Kluwer Academic Publishers,1988,103～120.
[11] Axelsson G,Bjornsson G,Flovenz OG,et al.Inject ion experiment s in low-t emperature geothermal areas in Iceland.Proceedings of the World Geothermal Congress 1995,Florence,Italy,3,1991～1996.
[12] Axelsson G,Flovenz O,Hauksdottir S,et al.Analysis of tracer t est data,and injection- induced cooling,in the Laugaland geothermal field,NIceland.Geothermics,2001,30:697～725.
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