Study on polymer flooding agent for EOR in high temperature and high salinity reservoirs
In order to meet the needs of continuous EOR in high temperature and high salinity reservoirs,a temperature resistant and salt resistant polymer flooding agent KWY300 is prepared by using acrylamide,2-acrylamido-2-methylpropane sulfonic acid,long carbon chain hydrophobic monomer and rigid monomer as synthetic raw materials,and its comprehensive performance is evaluated.The results show that polymer flooding agent KWY300 has good viscosity increasing performance,temperature and salt resistance.When the salinity of solution is 133 000 mg/L and aging temperature is 110℃,the viscosity value of polymer solution with mass concentration of 1 200 mg/L can still reach more than 80 mPa·s,and the viscosity increasing effect is obviously better than that of HPAM.KWY300 has good seepage performance.Under reservoir temperature and mineralization conditions,the resistance coefficient can reach over 50,and the residual resistance coefficient is about 10.In addition,polymer flooding agent KWY300 also has good oil displacement effect.After injecting 0.5 PV concentration of 1 200 mg/L KWY300 solution,the recovery of core water flooding can continue to increase by 16.4%,and the oil displacement effect is obviously better than that of HPAM.After the implementation of KWY300 oil displacement measures in high temperature and high salinity oil reservoirs,the daily oil production of production wells in the block increases by more than three times before the measures,and the water content decreases,achieving a significant increase in oil production.
high temperature and high salinitypolymer flooding agenttemperature resistancesalt resistanceapplication effect
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