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Contenu archivé le 2022-12-27

REINJECTION WELL AND SURFACE INSTALLATIONS FOR HEATING A PRISON, GREENHOUSE AND BUILDINGS

Objectif

To heat a prison and 5 ha of greenhouses to be built near Turnhout using an existing geothermal well drilled in Merksplas by the geological survey of Belgium.
Production and injection flow-rate expected are 150 m3/h with corresponding temperature of 75 deg. C and 30-40 deg. C.
The total savings forecasted are 1,500 TOE/yr and expected payback is approximately 20 years.

The first aim of the project was to drill a deviated injection well down to 1,850 m in order to maintain the pressure reservoir and because of the high salinity of the geothermal water (130 g/l).
The low injectivity index measured in the limestone (3 m3/h/Kg/cm2) and the high cost prevents the drilling of a deep injection well in the Dinantian reservoir.
The second target is the cretaceous reservoir made of chalk, lying at a shallow depth (800 m). This vertical reinjection well will be sunk 100 m away from the first well and a long term pumping test will evaluate the productivity - injectivity of the well and possible interference with a nearby underground gas storage.

In June 1987 the injection well was drilled down to 800 m with two cemented casings at 194 m (9" 5/8) and 710 m (7") ending up as an open hole, in 6" diameter, into the chalky reservoir.
Air lift and pumping tests indicate the following characteristics : flow rate - 20 m3/h, temperature - 35 deg. C at well head anda drawdown of 45 m.

An injection test using filtrated geothermal brine from the production well was carried out sucessfully in July 1987 at 75 m3/h and 19 Bars injection pressure. Total thermal power with a temperature drop of 39 deg. C (71 to 32) is estimated at 3 MW. The injectivity of the well Merksplas II is about 4 m3/hr/bar and physico-chemical studies have proved that the geothermal water coming from Dinantian reservoir is compatible with the cretaceous reservoir formation if the CO2 dissolved in the brine remains in solution and the systeem is free from oxygen. Both waters are free of bacteria but a treatment to prevent bacteria growth is recommended in the future development plant. Overlying sands at the top of the reservoir are considered as potential damage zone for reinjection. This zone has to be protected in the future development plan regarding the incomplete cementation job at the casing shoe. Additional work in the well is required prior to any exploitation of the doublet.

Thème(s)

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

GEWESTELIJKE ONTWIKKELINGSMAATSCHAPPIJ ANTWERPEN
Contribution de l’UE
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Adresse
Desguinlei 102 bus 13
2018 Antwerpen
Belgique

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