Objective To use high enthalpy water at least 200 deg. C to desalinate sea water on the Vulcano and Lipari islands. The reservoir to be tapped consists of lavas and tuffs at 800 m depth expected flowrate is 100 t/h with 1000 Kj/Kg enthalpy. To maintain pressure in the aquifer, an injection well is foreseen 1,8 Km south. The geothermal water will be used to generate electricity (1000 kW) for desalination of sea water (167 m3/h).Continuation of a project already supported by DG XVII (see GE 51/81/IT). Annual energy saving is estimated at 7000 TOE and corresponding payback is approximately 8 years.These two exploration wells are located in a fractured zone in the Northern margin of the "Gran cratere" cone. The practically similar stratigraphies of the two wells are characterised by pyroclasts and lavas interbeds to 460 m and further down by altered and brecciated lavas. Two main events effecting the rocks can be pointed out :- Fossil hydrothermalism power by the presence of quartz, calcite, anhydrite and pyrite- Thermometamorphism leading to the neoformation of biotite. By comparing these two wells with the well Isla di Vulcano 1 situated S.SW of the volcano, no scoriaceous horizons are present and the lava presents groundmass recrystallisation phenomena which indicate amore marked thermal metamorphism. The lack of geothermal productive zones seems very tight to those phenomena.The Vulcano Porto well has been drilled in March 1987 to a maximum depth of 1000 m. A second well Vulcano Porto Dir. A has been drilled by side track at 260 m and deviated to reach the depth of 903 m. At the bottom the two wells are 281 m apart.A common casing in 13 3/8 inches has been cemented at 231 m and the two wells drilled in 12 1/4 to the final depth.Geological section is made of tuffs, porphyretic lavas, trachyandesite lavas and altered breccias. Even though the two wells reached good temperature levels at the bottom (168 deg. C at 970 m for the vertical well and 242 deg. C at 960 m for the deviated one), they are dry because the volcanic rocks are not permeable. Fractures and breccia zones are always filled with calcite, anhydrite and silica. All these minerals which indicate a fully completed hydrothermalism prevent the geothermal water to circulate in the formations.In the 500-600 m interval, there is probably a widesprendporous fracture system indicated by strong mud losses during drilling operation.A test has produced a water with 29.7 g/l of Na Cl, PH = 7 and well head pressure of 3.5 Kg/cm2 but the brine is at low temperature (50-60 deg. C). Programme(s) ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989 Topic(s) 4.2 - INDUSTRY Call for proposal Data not available Funding Scheme DEM - Demonstration contracts Coordinator ENI SpA- AGIP EU contribution No data Address VIA EMILIA 1 20097 S. Donato Milanese (MILANO) Italy See on map Total cost No data
