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Effect of CR³+ on the rheology of xanthan formulations in porous media: Before and after gelation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, IOR 1991 - 6th European Symposium on Improved Oil Recovery, May 1991, cp-44-00062
- ISBN: 978-94-6282-133-0
Abstract
Experiments were performed to probe the rheology of chromium(III)-xanthan gels and gelants in porous media. For a large portion of the time before gelation, the presence of 90-ppm Cr³+ did not significantly affect the rheology of a 3000-ppm xanthan solution in Berea sandstone. After gelation, residual resistance factors were not much greater than those for xanthan solutions without Cr³+. Clay and carbonate minerals in Berea may have inhibited gelation by forcing the reaction to occur near neutral pH rather than at the injection pH of 3.8.