长岭气田一点法产能试井分析

Analysis of Single Point Well Test in Changling Gas Field

现场多采用一点法计算气井无阻流量而减少放空量。但是在应用一点法产能试井公式计算气井无阻流量时,不同气田的经验参数α值差异较大。研究了长岭气田6口稳定试井资料,发现部分井产能曲线反向,通过处理,校正了这部分井的产能数据。通过计算每口井的二项式产能方程,获取了每口井的产能系数,计算出长岭气田平均的产能系数(α=0.494 3),得到了长岭气田的一点法经验公式。通过与稳定测试得到的无阻流量进行比较,以及与常用的陈元千一点法、长庆气田一点法等计算结果进行对比,表明本文得到的一点法公式符合长岭气田实际情况。

Changling gas field is a typical volcanic gas reservoir with low porosity and low permeability.In well testing,in order to reduce the amount of natural gas emission,single point method is normally used to calculate absolute open flow of gas wells.However,the values——of parameter α in different gas fields are quite different.This paper studied six wells＇ testing data,found out that some well productivity curves were reverse,for which the abnormal well testing data were processed,correcting this part of well productivity data.And through getting each well productivity factor by using binomial equation and the average factor（α=0.494 3） of Changling gas field,the single point empirical formula for this gas field is obtained.Moreover,this paper presents the comparisons of this formula with the absolute open flows from stable well testing and single point methods proposed by ChenYuanqian and Changqing gas field.And the results indicate that this formula is suitable and practical for Changling gas field.