Adaptability of chromium gel to the strength of crossflow channel in high permeability reservoir

After a long-term waterflooding development, physical properties of the medium-high permeability reservoir have changed, resulting in the formation of injected water crossflow channels with different strengths along the high permeability zones,which seriously affects the development effect. In this paper, a dynamic plugging experiment were conducted to identify the injection,sealing capacity and displacement effect of chromium gel system (which is usually used on site) with different polymer concentrations (3000 mg/L and 5000 mg/L) in crossflow channels with different permeabilities. Moreover, pseudo-resistance factor and pseudo-residual resistance factor were adopted to analyze the adaptability of chromium gel to crossflow channel strength. The experimental results show that the higher the polymer concentration, the poorer the injectivity of gel, but the better the sealing capacity and the profile control and oil increasing effect. The higher the permeability of crossflow channel, the weaker the sealing strength of gel, and the poorer the profile control and oil increasing effect. The chromium gel is efficiently adaptable to 3 D, 5 D, 10 D and 50 D crossflow channels, but ineffectively adaptable to 100 D, 150 D and 200 D crossflow channels. The results can provide reference for using chromium gel to plug crossflow channels in high permeability reservoir.