Our test realisations
Geothermics in Orly: Crude oil-type drilling in the city centre
Customer name : OPAC du Val de MarneSector : Public contracting authorities
Date of realization : 2007-2008
Exhibition of actors for sustainable development
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Project description
Beneath the outskirts of Paris, located at a depth of between 1,500 and 1,800 metres, the Dogger aquifer contains water at a temperature of between 60 and 80°C. Since 1984, the Val de Marne OPAC has been using this aquifer from two drilling doublets supplying heating network extending to 18 km serving populations in Orly-Choisy-le-Roi and communal buildings.
In 2005, following a technical problem, the ORLY II doublet was closed. OPAC then took the decision to build two new wells, an extraction and a reinjection well, on the site of the defective doublet, in the centre of Orly, on a shopping centre car park.
OPAC commissioned ANTEA with the project management (design and works) for the construction of this new doublet. The expected power produced is a maximum of 10 MW (or 45,000 MWh per year) which is the equivalent of 5,000 homes.
The constructions were dimensioned to be able to operate at a flow of 300 m3/h at 76 °C. These volumes of hot water ensure 86% coverage from geothermics for OPAC’s heating network. This is an annual reduction of 15,000 tons of CO2 emissions.
Both directional drillings were carried out by COFOR from the same platform of approximately 5,000 m2. Both well heads are 1 m apart and the constructions are deflected to a distance of 1,500 m between the sampling point and the injection point at the Dogger.
This is the first deep aquifer doublet to be constructed in mainland France for over twenty years.
Professional divisions involved
