摘要
目前计算高压下天然气偏差系数最常用的是Dranchuk Abu Kassem模型 ,但在实际应用中 ,这种模型的计算结果存在较大的误差。根据Standing和Katz的天然气偏差系数图表 ,采用多重高阶曲线拟合方法 ,建立了高压天然气偏差系数的高精度解析模型 (简称LXF模型 )。利用两种模型对不同拟对比温度和拟对比压力组合条件下的天然气偏差系数进行了拟合计算 ,与理论图版值的误差对比显示 ,在高温高压条件下LXF模型的拟合结果更优 ,特别是随着拟对比压力的增加 ,LXF模型的误差不断减小 ,因此 ,该模型更适用于高压和超高压条件下天然气偏差系数的工程计算。由于LXF模型是数学解析模型 ,因而具有计算快速、方便的特点。同时在压力大幅度变化的情况下 。
Dranchuk Abu Kassem model (DAK model) is the most frequently used for calculating gas compressibility factor. Its application showed that the method was not accurate enough for calculating the compressibility of high pressure gas. A new calculation model (LXF model) is established using the simulating curves presented by Standing and Katz. The coefficients of the correlation are determined by fitting to the data of Standing and Katz Z factor chart. The results of the two models are compared, the conclusion can be drawn that the error of LXF model is smaller than that of DAK model. The error of LXF model results in decreasing dramatically with the augment of pseudo reduced pressure. The LXF model is of the mathematically analytical feature, so it can be applied to gas engineering calculation quickly and conveniently.
出处
《石油大学学报（自然科学版）》
CSCD
北大核心
2001年第6期45-46,51,共3页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
国家"8 63"重大研究项目 ( 863-82 0 -0 7-0 3)
关键词
油气藏参数
天然气偏差系数
拟对比温度
拟对比压力
解析解
计算模型
gas reservoir
gas compressibility factor
pseudo reduced pressure
pseudo reduced temperature
analytic solution
calculation model
