Objective
To heat by geothermal energy a group of new and established dwellings by means of an existing district heating system. The use of heat pumps to complement the heat exchangers is envisaged. Depending on their potential, three horizons can be tapped. These are Inframolassic Chattian sands between 1,100 and 1,550 m (fresh water at 50 deg C) the Lower Jurassic Limestone between 1,675 and 1,950 m (fresh water at 65 deg C) and, finally, Muschelkalk dolomite around 2,500 m (salt water at 95 deg C) which would only be tapped if the other two formations deliver a flowrate of less than 40 m3/h. A reinjection well would only be sunk if the deepest dolomite reservoir is tapped. The expected payback is between 6,5 and 8 years depending on the exploited reservoir.
The project is not successful. The geothermal flow (40 m3/h - 28 deg C) is lower than forecast (40 m3/h - 65 deg C) and for the time being its exploitation does not seem to be economic. The contractor has consequently decided to temporarily abandon the project and probably to pursue it in the future according to the evolution of oil prices.
The well was drilled down to a final depth of 2,100 m between April and June 1983. The casing runaway in the well - 18" 5/8 from the surface to 255 m
13" 3/8 from 210 to 626 m
9" 5/8 from 562 to 1,689 m
The last section (1,689 to 2,100 m) has been released as open hole 8" 1/2. The main formations tested showed no production potential and it was decided to produce the chattian Sands through perforations
(1,510-1,516 m and 1,448-1,452 m).
After backfilling the open hole with cement between the 2,100 and 1,554 m marks, a casing test carried out with a casing packer anchored at 1,439 m indicated that the drilling mud had penetrated the reservoir. Losses during operations - (280 m3) blocked production from the Chattian sandstone reservoir.
The hole was backfilled with cement plugs and mud to the 540 m mark and perforations performed in the 13" 3/8 casing in the upper marine molasse. The interval perforated 532-527 and 415-376 m allow the well to produce 8 m3/h (artesian flow). Recorded well head temperature is 28 deg C; pressure 2,8 kg/m2.
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Programme(s)
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Coordinator
7980 RAVENSBURG
Germany
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.