考虑偏差因子的高含硫气藏物质平衡方程

The model to calculate the reserve of high-sulfur natural gas with Z-factor involved

随着对高含硫气藏的深入了解,前人认识到硫沉淀对于高含硫气藏物质平衡方程的影响,相继推导出关于定容、水驱及封闭气藏的物质平衡方程。但是其假设均为在开采过程中温度的恒定,忽略了偏差因子对气藏的影响。实际上偏差因子作为温度压力和气藏组成的函数,反应了实际气体有别于理想气体气藏压缩性的特征,影响着储量计算的计算精度。本文不但考虑了偏差因子对气藏储量的影响,采用两种优选的计算方法及校正算法,而且考虑了不同温度下偏差因子的变化情况,进而编制开发了一种由VB语言开发的程序,其可以通过油田生产一段时间后的累积产量来反推算油田原始地质储量。本文突出意义在于对偏差因子的校正和不同温度下偏差因子的变化情况,大大降低了计算误差值,使预测的储量及产能更接近真实值。

In recent years, as for the deep understanding of the high sulfur gas reservoir, the predecessors have realized sulfur precipitation for the influence of high sulfur gas reservoir material balance equation, and subsequently derived for constant volume, water drive and close the material balance equation of gas reservoir. But its assumptions are in constant temperature in the process of mining, ignoring the effect of deviation factor of gas reservoir.The author thinks that, deviation factor as a function of the temperature and pressure and the composition of gas reservoir, the actual response of real gas is different from the ideal gas compressibility of gas reservoir characteristics, also affects the accuracy of calculation of reserves. This paper considers the effect of deviation factor of gas reservoir reserves, using two kinds of optimization calculation method and correction algorithm, and developed a software developed by VB language, can be opposite.