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Experimental Study of Sulfonated Polyacrylamide/Chromium Triacetate Hydrogels for Water Shutoff in the Ahwaz-Asmari Reservoir Conditions
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Shiraz 2009 - 1st EAGE International Petroleum Conference and Exhibition, May 2009, cp-125-00139
- ISBN: 978-90-73781-65-8
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Abstract
Among the methods available to reduce water production, injecting a gelling system composed of a polymer and a crosslinker has been widely used. In this work a new hydrogels were prepared by cross-linking of aqueous solutions of sulfonated polyacrylamide/chromium triacetate. The effects of co-polymer and crosslinker concentration and ionic strength were investigated by dynamic shear method (rheometer). Study of the viscoelastic behavior using dynamic rheometery showed that the limiting storage modulus of the hydrogels increased with increasing co-polymer and crosslinker concentration but its increasing effect from 1:5 to 1:2 crosslinker/co-polymer weight proportions on increasing elastic modulus is negligible. The effect of aging on G'/G" proportion showed that crosslinking rate decreases with increasing time. Water permeability for third water injection was about 1.8, while relative permeability was about 52 for second oil injection. Thus these gels indicated DPR (Disproportionate Permeability Reduction) and they are suitable candidates for water shutoff conformance.