中文摘要：

对气体拟压力的计算，一般将气体拟压力简化为压力平方项，或直接应用数值积分方法进行计算，不能准确表征实际气藏的气体拟压力。为此，以某一实际气藏的气体组分为例，通过精确地计算黏度μg和压缩因子Z,推导出这二者的乘积Zμg随压力和温度变化的分段计算公式，得到了适用于不同温度和压力条件下干气气藏的真实气体拟压力计算的新经验公式。计算结果表明，随着地层压力的增加，Zμg逐渐增加；压力较低时，Zμg随压力增大呈抛物线性增加，压力较高时，Zμg随压力增大呈线性增加；干气组分变化对拟压力的计算结果影响较小。新的经验公式计算结果与数值积分方法计算的拟压力结果相近。

英文摘要：

Generally, pseudo pressure for real gas is calculated by simplifying pseudo pressure as pressure square or using numerical integration directly, which can not exactly represent the pseudo pressure for real gas. With a gas composition of the gas field as an example, the paper calculates viscosity μ and compressibility factor Z, and presents a new empirical formula of the product of μ and Z with pressure p and temperature t going on, and obtains pseudo pressure for different dry gas with definite pressure and temperature. The results are received that Zμg increased with the respect to pressure, i.e. Zμg has a parabolic increase in an area of low pressure and a linear increase in an area of high pressure, and that gas composition has little effect on pseudo pressure calculation.