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含蜡原油的粘弹性参数储能模量G′和耗能模量G″可用来表征原油内部结构特征,它们在凝点和倾点附近随温度变化特性能够描述含蜡原油的胶凝特性和流动特性。采用ARES-G2控应变流变仪对大庆原油和马岭原油进行不同温度的应变测试,结果表明:随着应变增大,原油从线性粘弹区过渡到非线性粘弹区,并且线性粘弹区范围随着温度的升高而增大。在线性粘弹区范围内对经50℃恒温热处理的大庆原油和经33℃恒温热处理的马岭原油进行振荡剪切温度扫描,降温速率分别为1℃/min和0.8℃/min,应变为0.5%,频率为1Hz。结果表明:储能模量曲线和耗能模量曲线的两个交点温度可分别用以表征原油的凝点和倾点,且凝点和倾点之间符合线性经验关系。
The viscoelastic parameters of waxy crude oil storage modulus G ’and energy dissipation modulus G "can be used to characterize the internal structure of crude oil. They can describe the gelling properties of waxy crude oil with the temperature change characteristics near the pour point and pour point and Flow characteristics.The strain of Daqing crude oil and Muling crude oil at different temperatures were tested by ARES-G2 controlled strain rheometer. The results show that as the strain increases, the crude oil migrates from the linear viscoelastic region to the nonlinear viscoelastic region, and The range of linear viscoelastic region increases with the increase of temperature.On the range of linear viscoelastic region, Daqing crude oil heat-treated at 50 ℃ and Maling crude oil heat-treated at 33 ℃ are subjected to oscillatory shearing temperature scanning, the cooling rate Respectively, at 1 ℃ / min and 0.8 ℃ / min, strain of 0.5% and frequency of 1 Hz respectively.The results show that the two intersection temperatures of the storage modulus curve and the energy dissipation modulus curve can be respectively used to characterize the freezing point of crude oil and Pour point, and the pour point and pour point in line with the linear empirical relationship.