Indoor Evaluation of Weak Gel System for Profile Control in Low-permeability Fracture-type Oilfields
The performance of the weak gel system and its practical application in oil fields in detail were investigated through laboratory simulation and field application analysis.Experimental results showed that the gelation time of the weak gel system was significantly reduced from 115.2 min at 20℃ to 14.9 min at 70℃,and the viscosity was also reduced from 1560.5 mPa·s to 1047.2 mPa·s,reflecting the acceleration of chemical cross-linking by increasing temperature.In the aging stability experiment,the gel viscosity slowly dropped from the initial 1200 mPa·s to 1149 mPa·s over 3 months at room temperature,and from 1013 mPa·s to 970 mPa·s under high temperature conditions of 80℃.It was shown that the increase in temperature accelerated the aging process,but overall the gel showed good stability.In the shear stability test,gel viscosity dropped from 1198 mPa·s at 500 r·min-1 to 987 mPa·s at 5000 r·min-1,showing good shear stability.After the Dawa Oilfield adopted weak gel control and flooding technology,the daily oil production of oil wells increased by 50％on average,while reducing water channeling,optimizing oil-water stratification,and significantly improving the overall recovery efficiency of the oil field.
万方数据
维普
