Objective
The use of geothermal energy to provide the heating requirements for greenhouses covering 90,000 m2, providing a primary energy saving of 330 TOE to 2020 TOE/y depending on the connected surface of the greenhouses. Payback is estimated at 12 years, and the threshold below which the project becomes unprofitable is fixed at +- 70 m3/h and 44 C.
The drilling operation was successful and carboniferous limestones proved to be very productive. Production flow rate is 245 m3/h, 20% higher than forecast but the geothermal fluid temperature was only 29 deg. C instead of the 51 deg. C expected.
For the time being there are no satisfactory hydrogeological or geological reasons identified which could explain the very low thermal gradient measured in this well, only 16 Km from the Douvrain well which indicated a normal gradient.
The target is the carboniferous limestones already producing in several of Belgium's geothermal wells. The Karstic reservoir lies at 1,000 m and should yield an artesian flow rate of 100 m3 with a temperature of 52 C at the top of the aquifer: salinity is 1.4 g/l and average transmissivity 55 D.m. Geothermal heat will be delivered to the greenhouses through a simple exchanger. Geothermal output will provide 64% to 100% of total heat requirements.
The production well was drilled in December 1985: a pumping test at 1,300 m produced geothermal water ar 50 m3/h and 30 C with a drawdown of 200 m. A decision was then taken to deepen the well to 1,500 m.
The well is an open hole from 852 m to the bottom. A new test showed an artesian well with a wellhead pressure of 1 Bar, 100 m3 flow rate, 29 C temperature at the top of the reservoir, net pay of 1 m, 2.5 G/l salinity and transmissivity of 134 D. m. Pump assisted flow rate is 245 m3/h and corresponding drawdown 40 m.
Estimated total power of the well is 5,800 th/h in comparison with the forecasted 10,400 th/h.
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Programme(s)
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Coordinator
59163 CONDE-SUR-ESCAUT
France
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