高压流体气液相导热系数模型的建立

/ DEVELOPMENT OF A NEW THERMAL CONDUCTIVITY MODEL FOR HIGH PRESSURE FLUIDS

对温度Ｔ、导热系数λ和压力ｐ三者之间的关系进行了分析，建立了一个能够同时预测纯组分气液相导热系数的统一模型，它能够描述高压流体和超临界流体的导热系数随温度和压力的变化。在较宽的温度和压力范围内（Ｔ＝８０～１４００Ｋ，ｐ＝０．１～３５０ＭＰａ），对油气藏流体中常见组分的气液相导热系数进行了计算，２２个组分３２６３个数据点的拟合结果的平均相对误差为１２．５３％。通过引入常规的状态方程混合规则，将模型拓展应用于混合物导热系数的计算，１３种二元和三元混合物２６０个数据点的平均相对误差为１１．１９％；对３个石油馏分２２个点导热系数的预测结果的平均相对误差为８．８９％

The relationship between temperature, thermal conductivity and pressure was analyzed, and a model for predicting the thermal conductivity of gas and liquid was established. The model is able to describe the change of thermal conductivity of gas, liquid and highpressure reservoir fluids with the temperature and pressure. In the wide range of temperature (801 400 K) and the pressure (0.1350 MPa), the thermal conductivities of gas and liquid from oil and gas reservoir are calculated. The average error from 22 fractions (3 263 data) is 12.52%. By introducing the mixture rule of conventional state equation, the model can be applied to calculation of the thermal conductivity of mixture. The average errors for mixtures and petroleum fractions are 11.19% and 8.89% respectively.