摘要
对目前国内外使用的天然气偏差因子计算方法进行了分类和评价分析,指出各类方法的优缺点。在此基础上,建立了一种新的偏差因子计算方法,给出了新方法的基本思想、计算方法和计算结果。利用三种方式对计算结果进行了分析对比。对比结果表明:计算结果与Standing-Katz图版的误差趋于0;与目前公认最好的状态方程方法——DAK方法的结果相比,其最大相对误差小于1%。从而验证了该偏差因子计算方法的正确性。新的偏差因子计算方法具有计算速度快、精度高、范围大、计算机操作方便等优点。
The gas compressibility factors calculating methods in common use are classified and evaluated,and their advantages and disadvantages are described in this paper.Based on the comparison and analysis,a new method for calculating natural gas compressibility factors has been developed with its fundamental idea,calculating method and results.By comparing with other results in three different manners,the results show that the errors between the new method developed in this study and Standing-Katz type curve approximated to zero,and the maximal relative errors between the new method——DAK method,which is the most accuracy method for calculating Z-factor by using EOS,is less than 1%.The advantages of the method are that the computation speed is quick,the precision is high,the range of application is large.
出处
《油气井测试》
2007年第2期4-7,共4页
Well Testing
关键词
天然气
偏差因子
计算方法
评价分析
nature gas,gas deviation factors,calculating method,evaluation and analysis
