异常高压气藏气井三项式产能方程

在异常高压气藏中，气井非达西流动不能由传统的二项式产能方程表达，必须采用考虑了气井非达西流动效应和脉动效应的三项式产能方程。对于方程的建立，陈春艳给出的方法精度较低，且计算麻烦，还必须已知地层静压。为此，提出了一种精度高且计算简便的方法，不需要已知地层静压，只通过井底流压与产气量数据，利用多元线性回归方法，既可确定气井三项式产能方程，还可求得气井绝对无阻流量和地层静压。将该方法应用于四川盆地西35-1异常高压气井试井资料的整理，所获得的气井三项式产能方程精度高。实例对比分析结果表明，所提出的方法准确、可靠。

RINOMIAL DELIVERABILITY EQUATION FOR A GAS WELL IN ABNORMALLY HIGH PRESSURE GAS RESERVOIRS

As for abnormally high pressure gas reservoir,non-Darcy flow in a gas well cannot be expressed by traditional binomial equation,so the trinomial deliverability equation must be adopted which considers non-Darcy effect and pulsation effects. The method presented by Chen Chun-yan after this article is of low accuracy and troublesome,requiring define the reservoir static pressure in advance. This paper presents a simple method of higher accuracy,which is not required to define the reservoir static pressure in advance. The trinomial deliverability equation can be determined based on the data of bottom-hole flow pressure and gas production by using the rate multiple-regression,and the open flow capacity and static formation pressure can also be derived. The application of this method in data processing for the abnormally high-pressure gas well Xi35-1 in the Sichuan basin is proved to be with high accuracy in trinomial deliverability equation. The comparison with actual data shows that the method proposed herein is accurate,reliable and of great significance.