天然气偏差系数模型综合评价与选用

COMPREHENSIVE APPRAISAL AND SELECTION FOR GAS COMPRESSIBILITY FACTOR CALCULATING MODEL

介绍了石油工业中主要采用的几种天然气偏差系数计算模型 ,对各种模型在实际计算中的压力、温度适用条件与计算精度进行系统比较与评价 ,提出了不同压力、温度条件下的相应模型 ,推荐了在大范围压力、温度变化条件下分段选取气体偏差系数的计算模式。

The dispersion of temperature and pressure is very widespread in the process of exploiting HTHP gas reservoir. At present the calculation of gas compressibility factor for wide range of temperature and pressure combination is very immature. the most of different calculating models of gas compressibility factor,which are usually used in the petroleum industry,were discussed in this paper. Systematically comparing and estimating has been done to all the models, including Dranchuk-Abu-Kassem model, Hankinson-Thomas-Phillips model, Hall-Yarbough model, Dranchuk-Purvis-Robinson model, Li Xiangfang model and Sarem model. The author presents a view that different calculating model for gas compressibility factor has its the most applicable range of temperature and pressure combination in which the error of calculation is smallest. Then the paper recommends a proper calculating routine for gas compressibility factor in a wide range of temperature and pressure combination. The plates of gas compressibility factor have verified all conclusions in this paper.