Abstract
A novel combination consisting of microbial polysaccharide (diutan gum or xanthan gum) and branched-preformed particle gel (B-PPG) was systematically investigated by rheological method. Polysaccharide/B-PPG suspensions exhibit pseudoplastic fluid characteristics. Synergy occurs between polysaccharides and B-PPG on thickening the suspensions. The salt tolerance is improved by combining xanthan gum and B-PPG, and both of the temperature tolerance and salt tolerance are enhanced by combining diutan gum and B-PPG. The combination of diutan gum and B-PPG contributes to the formation of strong particle gel networks based on double helices and gel particles by van der Waals force and hydrogen bonding, improving the stability in high-temperature and high-salinity environments. It was confirmed that the heavy oil recovery efficiencies of diutan/B-PPG composite (17.4% original oil in place (OOIP)) and xanthan/B-PPG composite (8.2% OOIP) were higher than that of B-PPG alone (5.3% OOIP) at 90 °C and 244,121 mg⋅L−1 salinity.
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