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Shear and Elongational Rheology of Partially Hydrolyzed Polyacrylamide Used for EOR
Appl. Rheol. 23:5 (2013) 53800 (7 pages) ►
Rheological properties are one of the primary considerations in selecting a fluid for using in chemical flooding enhanced oil recovery (EOR) operations. In this work, the rheological behavior of partially hydrolyzed polyacrylamide (HPAM) used for EOR was characterized by different techniques like steady shear flow and uniaxial elongation in capillary breakup experiments. Particular attention was focused on the main parameters affecting flow behavior of solutions, such as polymer concentration, molecular weight and molecular weight distribution. The shear rate dependence of viscosity for HPAM solutions could be described by the Carreau model. Elastic model was used to fit the rheological results obtained by transient uniaxial extensional technique, which enabled to evaluate relaxation time. The results indicated that the elasticity of HPAM solutions was dominated by molecular weight. Shear viscosity at higher shear rates was mainly influenced by polymer concentration, which was not an important factor determining relaxation time. For HPAM solutions, increasing of molecular weight distribution led to a decrease in shear viscosity, and vice versa for elongational viscosity and relaxation time. In addition, it was found that there was direct proportional relationship between first normal stress difference and elongational viscosity.► Cite this publication as follows:
Wu S: Shear and Elongational Rheology of Partially Hydrolyzed Polyacrylamide Used for EOR, Appl. Rheol. 23 (2013) 53800.
Mathias Krebs, Olaf Wu.Sch
Development and testing of a new pressure cell for rheological characterisation of polymer melts
Appl. Rheol. 20:2 (2010) 23229 (6 pages) ►
A new pressure cell is described to measure the flow behaviour of polymer melts in dependence of temperature and pressure. Special attention is laid on the construction and functionality of the pressure cell. The pressure cell can be pressurized up to 120 bar and is heatable up to 260 C. As a measuring geometry a plate-plate-system is used which is capable of characterising high viscous fluids. First results with high viscous silicone oil show good agreement with known references in literature.► Cite this publication as follows:
Krebs M, Wunsch O: Development and testing of a new pressure cell for rheological characterisation of polymer melts, Appl. Rheol. 20 (2010) 23229.
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