Аннотация
The influence of storage time and temperature on the behavior of low acyl gellan (LAG) was studied by viscometry and 1 H NMR spectroscopy without salt addition.The viscometric results revealed that the effectiveness of salts to enhance gelation of gellan changes in the following order: BaСl 2 >CaCl 2 ≈MgCl 2 >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>MgCl 2 ≈CaCl 2 ≈BaСl 2 .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.