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Castelnuovo (Italy)

Geology, Reservoir Properties

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The steady state 3D numerical model of the reservoir started was obtained using the TOUGH2 V.2.1 numerical reservoir simulator extended for handling the properties of CO2 and water in a wide range of temperature and pressure conditions by means of ECO2H EOS. A the total reinjection of a fluid with 8 % w/w NCG phase made of 98 % CO2 and 2 % H2S ha s been simulated. The exploitation of the Castelnuovo-Mensano project is planned with 4 production wells with a flow of 9 kg/s each, and two reinjection wells with a flow of 18 kg/s each

 

The results show this geothermal prospect is able to have the expected production if located in a high permeable zone; the reinjection wells will have a skin zone surrounding but the distance the permeable and non-permeable zone boundary of the reservoir could affect the performance of the reinjection wells due to the feedback of the reinjection pressure wave. A total reinjection system is possible in the Qualtra geothermal project due to the relatively low reactivity of the reservoir rock and by a careful handling of the NCG plume that develop at the reinjection wells. 

 

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