大牛地气田气井无阻流量的确定方法研究

Study for Method of Determining Absolute Open Flow Potential in Daniudi Gas Field.

大牛地气田气井试井大多采用一点法,由于气层渗透性差,测试时间短,流压很难达到稳定,计算的无阻流量往往偏高,且无法获得正确的产能方程。通过气田多口井修正等时试井数据进行统计分析,获得了一点法试井在不同生产时间下计算无阻流量的经验公式;利用气田修正等时试井的二项式方程系数B,计算惯性阻力系数并经过曲线回归处理获得了经验关系式,很好地解决了一点法试井计算产能方程的问题。

One point method well testing is always used in Daniudi gas field. Because of bad percolation and short testing time, it is difficult for flow pressure to reach stable and get a right production potential equation. By statistic analysis for modified isochronal testing data from many wells in gas field, the well testing tech of one point method to acquire empirical equation for calculating absolute open flow potential under different work systems and by use of binomial equation coefficient to count inertia resistance coefficient and by curve regression to get empirical relationship formula, the way of calculating production potential equation by one point well testing is solved properly.