Université de Neuchâtel

Developing the ability to model acid-rock interactions and mineral dissolution during the RMA stimulation test performed at the Soultz-sous-Forêts EGS site, France = Développement des capacités de modélisation des interactions acides-roche et des dissolutions de minéraux au cours des tests de stimulation acide de type RMA réalisés sur le site SGS de Soultz-sous-Forêts (France)

Portier, Sandrine ; Vuataz, François-David

In: Comptes Rendus Geoscience, 2010, vol. 342, no. 7-8, p. 668-675

L’impact de la stimulation chimique sur le réservoir du Système Géothermal Stimulé (SGS) de Soultz est évalué par simulation numérique des processus couplés thermo-hydraulique-chimique. Les modélisations 2-D simplifiées du réservoir ont pour but d’interpréter et de prévoir les interactions acides-roche dans le granite fracturé du système géothermal stimulé de...

Université de Neuchâtel

Chemical stimulation techniques for geothermal wells: experiments on the three-well EGS system at Soultz-sous-Forêts, France

Portier, Sandrine ; Vuataz, François-David ; Nami, Patrick ; Sanjuan, Bernard ; Gérard, André

In: Geothermics, 2009, vol. 38, no. 4, p. 349-359

Rock matrix stimulation is a method of enhancing well production or injection within a broad range of challenging environments, varying from naturally fractured limestones to sandstones with complex mineralogy. A common and often successful stimulation option, matrix acidizing, utilizes acids that react and remove mineral phases restricting fluid flow. Reviewed is the technology of chemical...

Université de Neuchâtel

Preliminary Modelling of the Permeability Reduction in the Injection Zone at Berlin Geothermal Field, El Salvador

Portier, Sandrine ; Vuataz, François-David ; Barrios Martinez, Antonina Luz ; Siddiqi, Gunter

In: Proceedings World Geothermal Congress, 2010, vol. 22, no. 2231, p. 1-7

The exploitation of the Berlin geothermal field (El Salvador) started in February 1992 with two 5 MW electrical units. In December 1999, exploitation at a larger scale started with the operation of two turbo-generating condensation units of 27.5 MWe each. Since the beginning of exploitation until today, all the deep thermal fluids produced during the generation of electricity have been...

Université de Neuchâtel

Modelling Acid-Rock Interactions and Mineral Dissolution During RMA Stimulation Test Performed at the Soultz-sous-Forêts EGS Site, France

Portier, Sandrine ; Vuataz, François-David

In: Proceedings World Geothermal Congress, 2010, vol. 31, no. 3127, p. 1-8

The Soultz EGS reservoir’s response to chemical stimulation is assessed by numerical simulation of coupled thermo-hydraulic-chemical processes. To assess chemical interactions between host rocks and a mixture of HCl and HF as well as its potential effects on the Soultz EGS reservoir, new modelling efforts using the FRACHEM code have been initiated. This paper presents the model calibration and...