Prediction of Injection Induced Cooling Based on Analysis of Tracer Test Data in the Laugaland Geothermal Field, S-Iceland

doi:10.7523/j.issn.2095-6134.2005.6.016

Abstract

Abstract:

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

CLC Number:

P314

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]. , 2005, 22(6): 761-766.

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