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Polymers 2018, 10(7), 742; https://doi.org/10.3390/polym10070742

Impact of Mechanical Degradation on Polymer Injectivity in Porous Media

1
Department of Chemistry, University of Bergen, Allegaten 41, Bergen 5007, Norway
2
Uni Research CIPR, Allegaten 41, Bergen 5007, Norway
3
Energy Research Norway, Allegaten 41, Bergen 5007, Norway
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 21 May 2018 / Revised: 28 June 2018 / Accepted: 3 July 2018 / Published: 5 July 2018
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Abstract

Polymer flooding is an established enhanced oil recovery (EOR) method; still, many aspects of polymer flooding are not well understood. This study investigates the influence of mechanical degradation on flow properties of polymers in porous media. Mechanical degradation due to high shear forces may occur in the injection well and at the entrance to the porous media. The polymers that give high viscosity yields at a sustainable economic cost are typically large, MW > 10 MDa, and have wide molecular weight distributions. Both MW and the distributions are altered by mechanical degradation, leading to changes in the flow rheology of the polymer. The polymer solutions were subjected to different degrees of pre-shearing and pre-filtering before injected into Bentheimer outcrop sandstone cores. Rheology studies of injected and produced polymer solutions were performed and interpreted together with in situ rheology data. The core floods showed a predominant shear thickening behavior at high flow velocities, which is due to successive contraction/expansion flow in pores. When pre-sheared, shear thickening was reduced but with no significant reduction in in situ viscosity at lower flow rates. This may be explained by reduction in the extensional viscosity. Furthermore, the results show that successive degradation occurred which suggests that the assumption of the highest point of shear that determines mechanical degradation in a porous media does not hold for all field relevant conditions. View Full-Text
Keywords: HPAM polymer; rheology; viscosity; injectivity; mechanical degradation; polymer flooding HPAM polymer; rheology; viscosity; injectivity; mechanical degradation; polymer flooding
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Al-Shakry, B.; Skauge, T.; Shaker Shiran, B.; Skauge, A. Impact of Mechanical Degradation on Polymer Injectivity in Porous Media. Polymers 2018, 10, 742.

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