Application of fuzzy comprehensive judgment in optimum choice of polymer solution in Daqing oilfield

Polymer flooding is an effective way to enhance oil recovery of non-heterogeneous reservoir,whether the polymer is reasonable or not has much to do with the oil increasing effect.According to the oil reservoir and fluid property character of Daqing Oilfield Oil Recovery Plant No.2 and the polymer flooding theory,the technical inde- xes such as viscosifying capacity,stability capacity,heat endurance capacity,salt resistance capacity,and shearing resistance capacity has been brought forward in this pa- per.Through laboratory testing on these indexes,the tes- ting results are comprehensively judged by using fuzzy mathematics method.The results indicate that the fuzzy comprehensive evaluation method can evaluate the quali- ties of different polymers in ration under different condi- tions,and among"Daqing salt resistance","Beijing Hengju KYPAM-2",and"Daqing ultra high molecu- lar",these three polymers to be tested,and"Daqing salt resistance"is the best in general.