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Modeling the closure of thief zones in carbonate reservoirs using acids / Hamidreza Salimi in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10080–10093 Titre : Modeling the closure of thief zones in carbonate reservoirs using acids Type de document : texte imprimé Auteurs : Hamidreza Salimi, Auteur ; Karl-Heinz Wolf, Auteur ; Johannes Bruining, Auteur Année de publication : 2011 Article en page(s) : pp. 10080–10093 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbonate  Acids Résumé : Carbonate oil reservoirs can contain fractures and dissolution-vug pore space that may cause short-circuit flows between injection and production well. As a result, injected water bypasses the larger part of the reservoir, leaving much oil unproduced. This paper investigates the concept of reducing the permeability in the fracture that is causing the short-circuit flow by injecting a mixture of sulfuric acid and hydrochloric acid. During the process, reservoir rock dissolves and gypsum subsequently precipitates. We formulate a mathematical and numerical model that simulates the coinjection of sulfuric acid (H2SO4) with hydrochloric acid (HCl) into carbonate rock for both one- and two-dimensional settings. The carbonate rock contains a single fracture. A one-dimensional simulation of the process shows that upstream dissolution is the dominant process, whereas precipitation of gypsum occurs downstream. The two-dimensional simulation shows that downstream fractures are clogged, whereas continuous paths are created upstream. We find that the injection flow rate and acid ratio are the two main factors that influence precipitation and dissolution patterns within a fracture. The results show qualitative agreement with experimental results obtained in the Dietz−De Josseling laboratory. We conclude that injection of an acid mixture can be used to improve water-drive recovery performance from oil reservoirs that contain fractures between injection and production well. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100616x [article] Modeling the closure of thief zones in carbonate reservoirs using acids [texte imprimé] / Hamidreza Salimi, Auteur ; Karl-Heinz Wolf, Auteur ; Johannes Bruining, Auteur . - 2011 . - pp. 10080–10093. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10080–10093 Mots-clés : Carbonate  Acids Résumé : Carbonate oil reservoirs can contain fractures and dissolution-vug pore space that may cause short-circuit flows between injection and production well. As a result, injected water bypasses the larger part of the reservoir, leaving much oil unproduced. This paper investigates the concept of reducing the permeability in the fracture that is causing the short-circuit flow by injecting a mixture of sulfuric acid and hydrochloric acid. During the process, reservoir rock dissolves and gypsum subsequently precipitates. We formulate a mathematical and numerical model that simulates the coinjection of sulfuric acid (H2SO4) with hydrochloric acid (HCl) into carbonate rock for both one- and two-dimensional settings. The carbonate rock contains a single fracture. A one-dimensional simulation of the process shows that upstream dissolution is the dominant process, whereas precipitation of gypsum occurs downstream. The two-dimensional simulation shows that downstream fractures are clogged, whereas continuous paths are created upstream. We find that the injection flow rate and acid ratio are the two main factors that influence precipitation and dissolution patterns within a fracture. The results show qualitative agreement with experimental results obtained in the Dietz−De Josseling laboratory. We conclude that injection of an acid mixture can be used to improve water-drive recovery performance from oil reservoirs that contain fractures between injection and production well. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100616x