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Measurement of rheological properties of linked polymer solution by different viscometers
LIN Mei-qin, SONG Jin-hong, SUN Ai-jun, LI Ming-yuan, WU Zhao-liang
(Enhanced Oil Recovery Research Center in China University of Petroleum, Beijing 102249, China)
Abstract:
The viscosity of solution in the reactive process of low concentration and high molecular weight partially hydrolyzed polyacrylamide(HPAM) and aluminum citrate(AlCit) cross-linking system were determined by Ostwald capillary viscometer, dynamic viscometer and HAAKE RSI50 rheometer. The relationship between viscosity of HPAM/AlCit crosslinking system and shear rate was investigated for different reaction time. The experimental results show that the viscosity of HPAM/AlCit cross-linking system decreases with reaction time in lower shear rate and the system represents shear-thickening property after period of reaction time in higher shear rate. The linked polymer solution is formed by intra-molecular. cross-linking of HPAM and AlCit forming linked polymer coil(LPC) in lower concentration of the system, which is the r^-
Key words:  partially hydrolyzed polyacrylamide  aluminum citrate  linked polymer solution  viscosity