Comparison between a polyacrylamide and a hydrophobically modified polyacrylamide flood in a sandstone core
| Autor: | Redouane Borsali, Ana M. S. Maia, Rosangela de Carvalho Balaban |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Materials science Polyacrylamide Bioengineering 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 6. Clean water Biomaterials chemistry.chemical_compound Viscosity 020401 chemical engineering chemistry Chemical engineering Mechanics of Materials Acrylamide medicine Copolymer Organic chemistry Degradation (geology) 0204 chemical engineering 0210 nano-technology Porous medium Xanthan gum medicine.drug |
| Zdroj: | Materials Science and Engineering: C. 29:505-509 |
| ISSN: | 0928-4931 |
| DOI: | 10.1016/j.msec.2008.09.018 |
| Popis: | Polymer flooding in oil reservoirs to enhance oil recovery (EOR) has been used worldwide. However, the polymers applied, such as partially hydrolyzed polyacrylamides and xanthan gum, show a number of limitations related to their low salt tolerance and biological degradation, respectively. Therefore, the polymeric properties must be improved to maximize their application. With this goal in mind, a new class of polymers, named “hydrophobically modified water-soluble polymers”, has been developed. These polymers are very similar to conventional polymers used in EOR, except that they have a small number of hydrophobic groups incorporated into the polymer backbone. At incorporation levels of less than 1 mol% these hydrophobic groups can change polymer performance. In this work, a water-soluble polymer made of acrylamide and N,N-dihexylacrylamide was obtained. After characterization of the copolymer, its performance in a porous medium was evaluated through core flood experiments in Botucatu sandstone. In the presence of sodium chloride, the amphiphilic copolymer exhibited a significant increase in viscosity at low polymer concentrations, in addition to resistance factor and residual resistance factor values higher than those of a commercial polyacrylamide. This behavior can increase oil recovery, mainly in high salinity and high-permeability reservoirs, by improving waterflood sweep efficiency. |
| Databáze: | OpenAIRE |
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