Objective
To complete the first development stage of the Milos Island geothermal reservoir by drilling three or four wells to between 700 and 1,200 m, and to repair two wells drilled previously in 1975 and 1976, to a depth of 1,100 m.
Total potential of the island is estimated at between 40 to 100 MW. From the two repaired wells a 60 t/h (60%) steam production was obtained, at a well head temperature of 150 C. The projected temperature of the newly drilled wells is 180 C. at the top of the reservoir and 280 C. at the bottom.
The cost per geothermal kWh will be 33% less than the current cost per kWh generated by the diesel fueled station on the Island.
The 3 newly drilled wells revealed the existance of a reservoir at 500 to
1,100 m. The fluid in the well is liquid water close to boiling point and +- 10% salt content. The two phase mixture present at the surface consists of 36 to 75% steam. Initial calculations indicate a fluid enthalpy 1,500 to 1,700 KJ/Kg. Since the two phase flow occurs in the well bore and the reservoir, substantial increases in fluid enthalpy and pressure drop are possible.
Studies of deposits and plugging in the reservoir have been carried out since 1983. The 2 MW demonstration power plant was installed at the end of 1985 and the first production tests are being conducted with a 25 bar pressure separator which was installed at the M2 well.
A new attempt for testing the operation conditions of the demo plant will be carried out in 1988 with a modified 2 MW turbine.
The three new wells drilled were all productive, with the following characteristics:
Well M1 - final depth - 1,180 m with a 7" slotted liner from 870 to 1,175 m; static conditions - 320 C at 117 Bar at the bottom of the hole; salinity - between 60 and 90 g/l.
Dynamic conditions for production (with separators at atmospheric pressure): total flow rate - 100 t/h at 205 C and 18 Bar; two phase fluid (35% steam) with flash content expected in the reservoir; (350 Kcal/Kg enthalpy). Low gas content. Estimated transmissivity for reinjection - between 1 and 1.6 D.m.
Well M2 - (1.5 Km NNE from M1); total depth - 1,381 m with 9 5/8" slotted liner from 860 to 1,370 m. Static conditions: 300 C and 121 Bar at the bottom of the hole; salinity - between 130 and 150 g/l. Dynamic conditions for production (with the separator at atmospheric pressure): total flow rate - 47 t/h at 12 Bar and 187 C (between 65 and 70% steam). Low gas content. Flash in the reservoir. Fluid enthalpy - 480 Kcal/Kg. Estimated transmissivity for reinjection - 1.4 D.m.
Well M3 - (0.8 Km NE M1) - final depth - 1,017 m with 9 5/8" slotted liner from 800 m to 1,000 m. Static conditions: 260 C; well shut-off pressure - 44 Bar; salinity - between 130 and 140 g/l. Dynamic conditions for production (with the separator at atmospheric pressure): total flow rate - 125 t/h (steam 50%) at 29 Bar and 200 C. Low gas content. Flash in the reservoir. Estimated fluid enthalpy - 455 Kcal/Kg. Estimated transmissivity for reinjection - between 1.4 D.m. and 1.8D.m. Skin - + 0.5. Three types of rocks have been encountered:
- superficial volcanic formation (impermeable);
- neogene formation (conglomerates, limestone and sands);
- minor metamorphic formation with slight traces of igneous rocks.
Total CaCO3 content is 5 to 15%, principally filling the fractures. The total salinity content is mainly in sodium chlorate.
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Coordinator
10436 Athens
Greece
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