AGA8-92DC方法计算天然气偏差因子的研究

Study on AGA8-92DC Method of Gas Deviation Factor Calculation

偏差因子是天然气的重要物性参数,在天然气的勘探、开发、运输、加工及利用等方面均发挥着重要作用。对现有气体偏差因子的计算方法进行了总结和归纳,并且对国家标准AGA8-92DC偏差因子计算方法(简称AGA8方法)进行了专门的研究。目前,国内关于AGA8方法的研究工作开展很少,致使工程人员对该方法的计算精度和适用范围缺乏深刻的认识,最终限制了该方法的工程应用。为了对AGA8方法的适用性进行专门研究,利用自行编制的AGA8方法的C++程序,计算了单组分、双组分及多组分气体在不同温度和不同压力下的偏差因子。通过与Standing-Katz图版及实验数据对比,给出了AGA8方法的工程适用范围。本研究对AGA8方法的工程应用推广将发挥重要作用。

The deviation factor,as one of the most important physical property parameters of natural gas,plays an important role in the exploration,production,transportation,processing and use of natural gas.In this paper,the existing methods of calculating the gas deviation factors are summarized,and a special research of a widely used method named AGA8-92DC(AGA8) is conducted.Although AGA8 has been an international standards on calculating gas deviation factors since 1992, few studies have been conducted up to now.So the scope of application or the accuracy of AGA8 is not well known.Using the self-compiled C++ program for AGA8, we obtain the deviation factors of the gases with different components under different temperatures and pressures.By comparing the computed deviation factors with the Standing-Katz chart data or experimental data,the scope of application of AGA8 is determined.This study will lay a solid foundation for the application and extension of AGA8 method.