气井产能递减规律研究

PRODUCTIVITY DECLINE LAW OF GAS WELL

为获取未来产能数据,减少因产能测试而关井对生产造成的影响,利用气藏工程产量递减分析理论,结合在气田实际生产中产能变化与生产时间的关系并不明显的事实,引申定义了三种新产能递减率——压力水平αp、压力平方αp2、采出程度αR,推导得到了它们在不同递减类型下的表达式。同时对某气藏的6口气井进行了产能递减分析,结果表明该气藏压力水平产能递减规律适应性最好,并且大多属于直线递减。这使其就能更准确、更方便地预测产能,为合理配产和生产调控提供更可靠的依据。

To acquire the future data of productivity and minimize the influence of shut-in due to productivity test,according to production decline analysis,considering the fact that the real productivity changes without production time,this paper defines three new productivity decline rates-pressure level αp,pressure square αp2 and recovery percent αR,and derives their expressions in different decline types.In addition,productivity decline of six wells in a certain gas reservoir has been analyzed.Result shows that the decline law of pressure level in this reservoir has the best adaptability with almost declining in straight line.It can predict productivity more accurately and conveniently,and provide a reliable basis for production control.