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在气层开发过程中,天然气偏差系数是非常重要的高压物性参数之一,在储量计算和动态分析等工作中必不可少。目前,主要通过实验、查图版及公式计算方法获取该参数值。通过对样品气相偏差系数计算结果分析得出以下结论:塔河油田高温高压凝析气层在计算偏差系数时,应考虑非烃影响;采用SSBV混合规则能够明显提高计算精度;HY法与DAK法均能得到较好的效果;DAK具有更高的精度及适应性,计算时建议选用DAK计算法。
Natural gas deviation coefficient is one of the most important high-pressure physical parameters in the process of gas reservoir development. It is indispensable in reserves calculation and dynamic analysis. At present, this parameter value is mainly obtained through experiments, check chart version and formula calculation method. Based on the analysis of the calculation results of gas phase deviation coefficient, the following conclusions are drawn: The non-hydrocarbon influence should be considered when calculating the coefficient of variation for the HTHP condensate layer in Tahe Oilfield; the calculation accuracy can be obviously improved by the SSBV mixing rule; Can get better results; DAK has higher accuracy and adaptability, calculation recommended DAK calculation method.