测量温度对青海原油等温胶凝特性的影响

摘要

The effect of temperature on the isothermal gelling properties for waxy crude oil after three historical conditions were studied in detail. The AR-G2 rheometer was used for small amplitude oscillatory shear mode. The results show that the storage modulus of waxy crude oil all increase with the decrease of temperature no matter what the historical condition is. The variation of loss angle shows significant difference. After static cooling, with the decrease of temperature, the loss angle becomes small.While after static cooling and isothermal shearing or after dynamic cooling, the loss angle decreases first and increases finally with the temperature decreasing. All the variation of storage modulus with time can be fitted well with one model and the correlation coefficients of the fitting curves are related to test temperature for the oils under the different histories. The correlation coefficients with the temperature changing are affected by the historical conditions before isothermal shearing.%利用AR-G2流变仪在小振幅振荡剪切模式下考察测量温度对经历不同历史的含蜡原油等温胶凝特性的影响.结果表明:在3种历史条件下,随温度的降低,原油在相同的静止时间所对应的储能模量均增大,但其损耗角的变化规律则表现出明显的不同;原油经静态降温后,测量温度越低,其相同静止时刻的损耗角越小,而原油经静态降温并恒温剪切或动态降温后,其损耗角则随温度的降低表现出先降低后升高的趋势;不同条件下原油储能模量随时间的变化曲线均满足同一模型,且其拟合参数均与温度有关,但拟合参数随温度的变化规律受原油恒温静止前所经历的历史条件影响.