潍北油田高凝油含蜡量高、凝固点高,当温度低于析蜡点时,呈现出非牛顿流体特征,其特性受剪切作用影响较大.为此,开展了非牛顿高凝油的室内剪切降黏降凝实验.研究表明,在剪切作用下,非牛顿高凝油的黏度大幅降低；非牛顿高凝油具有剪切稀释性,且温度越低,剪切稀释性越明显；剪切速率对非牛顿高凝油的凝固温度、凝固时间影响较大,在凝固点附近剪切时,凝固温度可降低5～6℃、凝固时间明显延长；剪切时间对非牛顿高凝油的凝固温度影响很小,对凝固时间影响较大,在凝固点附近剪切20 min(转速100 r/min),凝固时间可延长8～17 min.%The wax content and freezing point of the high-pour-point-oil in Weibei Oilfield are high. When the temperature is below the wax precipitation point, the high-pour-point-oil behaves as a non-newtonian fluid which is greatly affected by shear. Thus, the shear viscosity and pour point reduction experiments of non-newtonian high-pour-point-oil were conducted. The results show that under the shear function, the viscosity of non-newtonian high-pour-point-oil is reduced greatly; the non-newtonian high-pour-point-oil presents shear thinning and the lower the temperature is, the more obvious the shear thinning is; the shearing rate has greater effect on the freezing point and freezing time of non-newtonian high-pour-point-oil; under the shear function near freezing point, the freezing point can be reduced by 5~6 癈 and the freezing time is obviously prolonged; the shearing time has little impact on the freezing point and has greater influence in freezing time and when it shears about 20 mindhe rotational speed is 100 r/min), the freezing time can be prolonged by 8~17 min.
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