Rheology of a New Sulfonic Associative Polymer in Porous Media
- Randall S. Seright (New Mexico Tech) | Tianguang Fan (New Mexico Tech) | Kathryn Wavrik (New Mexico Tech) | Hao Wan (New Mexico Tech) | Nicolas Gaillard (SNF Floerger) | Cédrick Favéro (SNF Floerger)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- December 2011
- Document Type
- Journal Paper
- 726 - 734
- 2011. Society of Petroleum Engineers
- 5.3 Reservoir Fluid Dynamics
- Associative polymer, Polymer flooding, Rheology in porous media
- 4 in the last 30 days
- 1,037 since 2007
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For hydrophobically associative polymers, incorporating a small fraction of hydrophobic monomer into a hydrolyzed polyacrylamide (HPAM) polymer can promote intermolecular associations and thereby enhance viscosities and resistance factors. In this paper, we investigate the behavior of a new associative polymer in porous media. The tetra-polymer has low hydrophobic-monomer content and a molecular weight (Mw) of 12-17 million g/mol. Total anionic content is 15-25 mol%, including a few percent of a sulfonic monomer. This polymer is compared with a conventional HPAM with 18-20 million g/mol Mw and 35-40% anionic content. Rheological properties (viscosity vs. concentration; and shear rate and elastic and loss moduli vs. frequency) were similar for the two polymers [in a 2.52% total dissolved solids (TDS) brine at 25°C]. For both polymers in cores with permeabilities from 300 to 13,000 md, no face plugging or internal-filter-cake formation was observed, and resistance factors correlated well using the capillary-bundle parameter. For the HPAM polymer in these cores, low-flux resistance factors were consistent with low-shear-rate viscosities. In contrast, over the same permeability range, the associative polymer provided low-flux resistance factors that were two to three times the values expected from viscosities. Moderate shear degradation did not eliminate this effect--nor did flow through a few feet of porous rock. Propagation experiments in long cores (up to 157 cm) suggest that the unexpectedly high resistance factors could propagate deep into a reservoir--thereby providing enhanced displacement compared with conventional HPAM polymers. Compared with HPAM, the new polymer shows a significantly higher level of shear thinning at low fluxes and a lower degree of shear thickening at high fluxes.
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