Behavior of gellan in aqueous-salt solutions and oilfield saline water

Keywords: gellan, viscosity, rheology, sol-gel-sol transition, phase transition

Abstract

The influence of storage time and temperature on the behavior of low acyl gellan (LAG) was studied by viscometry and 1H NMR spectroscopy without salt addition. The viscometric results revealed that the effectiveness of salts to enhance gelation of gellan changes in the following order: BaСl2>CaCl2»MgCl2>KCl>NaCl. The sol-gel and liquid-solid phase transitions of gellan solutions were observed upon addition of oilfield water containing 73 g L-1 of alkaline and alkaline earth metal ions. The effectiveness of salts to induce the separation of liquid and solid phases changes in the sequence: NaCl>KCl>MgCl2»CaCl2»BaСl2. The hydrodynamic behavior of 0.5 wt.% gellan solution injected into the sand pack model with high (20 Darcy) and lower (2 Darcy) permeability is useful to model the oil reservoirs in the process of enhanced oil recovery.

Author Biographies

Zhanar Nurakhmetova, Laboratory of Engineering Profile of K.I. Satpayev Kazakh National Research Technical University, Almaty
Institute of Polymer Materials and Technology
Iskander Gussenov, Laboratory of Engineering Profile of K.I. Satpayev Kazakh National Research Technical University, Almaty
Institute of Polymer Materials and Technology
Gulnur Tatykhanova, Laboratory of Engineering Profile of K.I. Satpayev Kazakh National Research Technical University, Almaty
Institute of Polymer Materials and Technology
Sarkyt Kudaibergenov, Laboratory of Engineering Profile of K.I. Satpayev Kazakh National Research Technical University, Almaty
Institute of Polymer Materials and Technology

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Published
2015-09-30
How to Cite
Nurakhmetova, Z., Gussenov, I., Tatykhanova, G., & Kudaibergenov, S. (2015). Behavior of gellan in aqueous-salt solutions and oilfield saline water. Chemical Bulletin of Kazakh National University, (3), 34-40. https://doi.org/https://doi.org/10.15328/cb640
Section
Organic and Polymers Chemistry