Geochemical monitoring at Soultz-sous-Forêts France between October 2006 and March 2007, after the chemical stimulations RMA, NTA and OCA carried out in the wells GPK-4 and GPK-3.Report as inadecuate




Geochemical monitoring at Soultz-sous-Forêts France between October 2006 and March 2007, after the chemical stimulations RMA, NTA and OCA carried out in the wells GPK-4 and GPK-3. - Download this document for free, or read online. Document in PDF available to download.

1 BRGM - Bureau de Recherches Géologiques et Minières 2 University of Utah 3 GroupeES - ESGéothermie

Abstract : This paper presents the main results obtained during the geochemical monitoring of the fluids and deposits collected from the wells GPK-4 and GPK-3 after the four operations of chemical stimulation carried out in May and October 2006, and February 2007, at Soultz-sous-Forêts. During these operations, solutions of Regular Mud Acid RMA, Nitrilo-Triacetic Acid NTA and Organic Clay Acid HT OCA were successively injected with fresh water into GPK-4 whereas only the OCA treatment was used for GPK-3. This paper shows that these acids have actively reacted with minerals present in the fractured and porous areas of the granite. The injection of the NTA basic solution pH 12 into GPK-4 has allowed cleaning this well and a part of the fractured areas, and recovering significant amounts of drilling wastes grease, rests of cuttings, rock fragments and hydrothermal deposits. Dissolved and solid Ca-Fe-NTA compounds were also formed. The combination of the RMA, NTA and OCA treatments is possibly at the origin of the significant increase of GPK-4 productivity. No major improvement in injectivity was observed for the well GPK-3 for which only the OCA treatment was used.





Author: Bernard Sanjuan - Peter Rose - André Gerard - Catherine Crouzet - Stéphane Touzelet - Anne Gautier - A. Charlot

Source: https://hal.archives-ouvertes.fr/



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