高凝油流体特性研究

通过气相色谱分析了大庆油田某区块高凝油油样的组成,按照相应方法测量了油样的密度,凝固点,析蜡点和反常点,平均分子量等。使用HAKKE-RS150流变仪测量了剪切应力随剪切速率的变化和粘度随温度的变化,根据以上结果对高凝油油样的流变模式进行了分析研究。实验结果表明,含碳量最高值出现在C22附近;温度是影响高凝油的粘度的重要因素,其粘度与温度的关系曲线出现两个拐点;当温度较低时,此时高凝油受到剪切其粘度会大幅降低;当温度低于反常点时,3组油样均呈现出非牛顿流体的特性,具体表现为剪切变稀性,可以在井筒中的合适深度安装加热装置和剪切装置,从而降低高凝油粘度使其保持良好流动性。

Study On High Pour-point Oil Flow Characteristics

High pour-point oil sample from Daqing oil field was analyzed by gas chromatography. And density, freezing point, related point and abnormal point and average molecular weight of the sample were determined according to the relevant inspection standards. The viscosity-temperature curve and rheological curve of high pour-point oil sample were measured, the rheological model of three groups of samples were analyzed and studied using HAKKE - RS150 rheometer. The results show that the average carbon number of the sample is C22 or so; the viscosity of high pour-point oil is very sensitive to temperature, and the viscosity-temperature relationship shows three line type; when high pour-point oil is sheared at low temperature, its viscosity decreases greatly; when temperature of high pour-point oil is below abnormal point, three groups of samples are non-Newton fluid that has the feature of shear thinned; heating and high-speed shear pump measures can effectively improve production effect.