Molecular Configuration And Flow Characteristiscs Of Polymer And Gel

The main oilfield in the east at home has enter into the middle and the last phases of developme, the heterogeneity of reservoir is intensified because of flood development for a long term, and the phenomenon of invalid circulation of injected water in high permeable strata become more serious, so the technique of profile modification of polymer gel has been one of the most important technique to improve the development effect of water flooding and polymer flooding. Making use of instrument check and theory analysis method, the paper does some experimental researches on the scheme composition of Al³⁺ cross-linked polymer gel, the critical condition that"molecule inner reaction"and"intermolecular reaction", and the flow property and characteristiscs of shaping gel of different configuration polymer gel. And the paper also does some researches on influence of the types and concentration of electrolyte to the size of polymer molecular clews in the polymer solution and does some analysis on mechanism of action.The results show that there are some influences of the concentration of polymer, cross-linked agent and electrolyte to the polymer gel molecualar configuration, and the influences of the types and concentration of electrolyte is the largest, in which the influences of Ca²⁺ is the greatest, the Mg²⁺ is the second, and the Na⁺ the smallest. The influence effect of electrolyte to the polymer gel molecualar configuration in polymer solution is completely different at different scope of concentration. Within the specific scope of concentration, the greater the electrolyte concentration is, the smaller the polymer clews, while exceed the scope of concentration, the greater the electrolyte concentration is, the greater the polymer clews. According to adjust reasonably the types and concentration of electrolyte of solvent water, we can realize the adjust of the size of polymer molecular clew and the molecular configuration of polymer gel to abtain the water flooding system with better flow property.