关键词: 分散, 凝胶, 聚合物, 吸附, 滞留

Abstract: The characteristics of adsorption/retention of colloidal dispersion gel (CDC)in core-flooding is investigated in the paper. The CDG system is a cross-linked polymer system, composed of partially hydrolyzed polyacrylamide (HPAM, 150 mg/L) and aluminum citrate (AlCit) aqueous solution. In the core flooding experiment,the characteristics of adsorption/retention of CDG in core is determined, by comparing with the adsorption of CDG on silicon sand (100～180 mesh). The results show that CDG was lost in the core by retention and adsorption of the gel particles,and HPAM and AlCit by adsorption of these molecules, and the retention of the gel particles is dominated. In the condition of this experiment,the values of retention of polymer and aluminum were 102.8 μg/g and 7.4 μg/g, respectively. The value of resistance factor of the core was increased with the value of adsorption/retention of CDG in the core. The value of residual resistance factor of the core was about 50 after 8.64 PV CDG was injected and water flooding followed. The result shows that CDG has significant ability to modify the permeability of the core.

Key words: dispersion, gel, polymer, adsorption, retention