Polyacrylamide-Cr+6 gels are being used for reducing water-oil ratio with varied success. Out of many factors affecting the process of water control, chemical characterization of the gels plays an important role. Present paper describes the phenomenon of gelation with special reference to its characterization which is carried out through following laboratory studies:

  • Yield optimization

  • Thermogravimetric studies

  • Elemental analysis

  • I.R. studies

  • X-ray differaotion studies

  • Stability of gels and

  • Solubility of gels

The present studies reveal that gelation process of polyacrylamide with chromium ions takes place through co-ordination bonding with nitrogen. The optimization studies have indicated that better results are expected in the following concentration ranges of the reactants:

  • Polymer = 2.0 – 3.0 g/L

  • Reducer = 1.5 – 2.0 g/L

  • Oxidiser = 1.5 – 2.0 g/L

In addition, the gels formed at neutral pH, have been observed to be comparatively stable and sustain the reservoir temperature for 50 days. Solubility in chemicals like HCl, mud acid, hydrogen peroxide indicates that these chemicals can be used as breakers.

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