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天然气压缩因子或超压因子计算结果的准确性直接影响天然气流量计量的准确性。当前国内天然气计量界广泛使用AGANX－19，AGA8号报告，ISO12213－1997三种天然气压缩因子计算方法标准。文章研究了这三种天然气压缩因子计算方法标准，并编写了NGZCWIN天然气压缩因子计算软件，通过对不同气样和不同湿度，压力条件的计算，比较了三种计算方法的差别，并对这种计算方法的应用范围和不确定度提出了看法。

A COMPARISON OF THE METHODS FORCALCULATING NATURAL GAS DEVIATION FACTORS USED FOR METERING

The accuracy of the results in calculating natural gas deviation factors or supercompressibility factors directly affects the metering accuracy of gas flow rate.At present,the domestic natural oil and gas metering circles widely use three criteria for calculating natural gas deviation factors,i.e.AGANX-19 and AGA 8 reports and ISO 12213-1997.In this paper,the three criteria for calculating natural gas deviation factors are studied,the NGZCWIN software for calculating natural gas deviation factors is compiled,the differnece among the three calculation methods is compared through calculating different gas samples at different temperature and pressure and some opinions on the application scale and indeterminateness of these calculating methods are put forward.