Objective
To use geothermal energy to heat 10 hectares of new greenhouses (6 Ha with warm air heating and 4 Ha of plastic tunnels with ground heating of pipes).
According to the project design,a primary energy saving of 1000 TOE/year is expected with a corresponding payback of 4 years.
The geothermal target, a reservoir with a forecast temperature of 45 deg.C is at 1200 m depth and contains jurassic limestone and dolomite (see also project GE/00421/85/FR).
Expected water flowrate of 200 m3/h of drinking water would allow the exploitation of the geothermal source by means of a single well without reinjection and to use the water after cooling, for irrigation purposes.
Back up will be ensured by natural gas and a heat distribution network in PVC pipes with neither heat exchanger nor heat pump.
The jurassic geothermal reservoir is very productive but its temperature 20 deg.C lower than forecast would reduce the development of this considerable production potential. Fish farming installation operational in 1991. A new feasibility study has been carrid out with the CEMAGREF (Specicialized department of Ministry of Agriculture) in September 1988.
The pilot plant for SILURES GLANE intensive growing is ongoing with good efficiency results.
The fish farming installation have received the DG XIV support and the plant would be operational before the end of 1990.
A fish production of GOT/year is expected.
Production well drilled down to a final depth of 1350 m between July and November 1986. The reservoir extends from 1160 m to 1380 m.
Well design is:
- 0 - 220 m 13" 3/8 casing
- 220 - 400 m 9" 5/8 casing
- 400 - 1161 m 7" casing.
Limestone reservoir drilled with bentonitic mud (density +/- 1,05) and constant losses had been obviously plugged and further tests showed a poor productivity. of 40 m3/h air lift assisted with a 500 m corresponding drawdown
It was then decided to deepen the well in jurassic formations to a final depth of 1500 m. The carbonaceous formations (dolomite) crossed between 1350 and 1500 m are productive open hole. After acidification (20T) the artesian flowrate is 80 m3/h and the well will produce 300 m3/h pump assisted flowrate. Geothermal bottom hole temperature is 26 - 27 deg.C and salinity very low (under 0,56/l).
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Programme(s)
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Coordinator
34530 MONTAGNAC
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.