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Contenu archivé le 2022-12-27

HEATING OF BUILDINGS USING GEOTHERMAL ENERGY [STAGE 1]

Objectif

To heat the new Western Esplanade district in the centre of Southampton including a shopping centre, offices, hotel and central baths.
Geothermal energy will provide 87% of the heat requirements and will cover daily fluctuation in demand by means of storage tanks. A coal fired boiler provides back-up. The geothermal reservoir to be produced by a single well is formed by Permo-Triassic sandstones. The detrital formations lie between 1,700 and 1,800 m. A flow-rate of 75 m3/h at 60 C is forecast. If it is not necessary to drill an injection well in order to maintain pressure in the reservoir the geothermal water will be discharged into a nearby estuary through a main storm water sewer.
Expected annual savings are 1,500-2,000 TOE and corresponding payback +- 14 years.
The success of this operation has renewed interest in geothermal energy in the New Hampshire area. The geological sequence proved in the well is similar to that found in the Marchwood pilot borehole and the forecast geological section. Flow-rate is good and temperature higher than expected. However the existence of a barrier in the aquifer to NE/E and south of the well may limit the size of the geothermal reservoir. The evidence suggests the reservoir extends 200 km2. An economic well life of 15-20 years should be possible if the well is pumped at 10 l/s.
The production well was drilled between September and December 1981 to the final depth of 1,827 m. The aquifer was found between 1,729 and 1,796 m, in a layer of Sherwood sandstone (Triassic formation) . The hole was widened to 12"1/4, following installation of a 9"5/8 liner between 861 and 1,717 m. The reservoir was left as an open hole. After acidification, N2 lift tests in January 1982 achieved a maximum flow-rate of 108 m3/h for a drawdown of 42 Kg/cm2. Characteristics are :
temperature at the bottom of the hole 76 C; salinity - 125 g/l; net pay - 11 m; estimated transmissivity between 3 and 4 D. m. (non-stabilised). Trials and tests on core samples showed that the permeability was very low and varied widely from one level to the other. Some 90% of production was concentrated between 1,738 and 1,753 m, where permeability was between 0. 28 and 0. 47 D. m. Comparison of the characteristics and monitoring of the well during pumping, suggest there is a permeability barrier betweenthe Marchwood and Southampton wells ( 1. 9 Km apart).
The long-term trials were delayed by problems with the submerged pump and started on the 15th January 1983. The contractor decided to carry out the long-term trials with a hydraulic pump having a maximum flow-rate of 90 m3/h. Due to successive damage of the non -submerged part of the pump, the long-term trials have been reduced to 4 periods of 5 to 8 days each, with an intermediate interruption of 4 days for maintenance. In the middle of March the prolonged pumping trials were completed. During these trials, water was obtained from the aquifer at a temperature of 74 C, a flow-rate of 72 m3/h and a corresponding drawdown of 300 m.

Thème(s)

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

SOUTHAMPTON CITY COUNCIL
Contribution de l’UE
Aucune donnée
Adresse
Civic Centre
SOUTHAMPTON
Royaume-Uni

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Coût total
Aucune donnée