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凝析气田的开发需要准确的凝析气藏流体相态性质数据,其中露点压力的快速、准确预测对于凝析气的工业开采非常重要。对比分析了现有凝析气藏流体露点压力关联式的优缺点,并从凝析气藏流体本身的特性出发,通过实测数据资料拟合,建立了综合气藏温度、组成、C7+组分性质的凝析气藏流体露点压力预测关联式。对14组国内不同地区凝析气藏流体样品的露点压力预测结果对比表明,新关联式的绝对平均偏差为1.24%,精度远高于其他经验关联式和状态方程模型,并且适用于甲烷摩尔组成为65.59%～93.09%,气油比为1 002～63 377m3/m3的较广阔范围的凝析气藏流体。
The development of condensate gas fields requires accurate data on the phase behavior of condensate gas reservoirs, in which rapid and accurate dew point pressure prediction is very important for the industrial production of condensate gas. The advantages and disadvantages of the correlation formulas of fluid dew point pressure in condensate gas reservoirs are compared and analyzed. Based on the fluid properties of condensate gas reservoirs, the temperature, composition, C7 + component properties Condensate reservoir fluid dew point pressure prediction correlation. Comparison of prediction results of dew point pressure of condensate gas samples from different regions in 14 groups shows that the absolute mean deviation of the new correlation is 1.24%, which is much higher than other empirical and equation of state equations and is suitable for methane molar composition Is 65.59% ~ 93.09%, gas-oil ratio is 1 002 ~ 63 377m3 / m3 in a wide range of condensate gas reservoir fluid.