摘要
在研究页岩气藏特征及渗流规律的基础上,建立了考虑解析作用的页岩气井渗流微分方程,求解了定生产压力圆形封闭地层中心一口垂直页岩气井的无因次Laplace空间流量解,并通过Stehfest数值反演绘制了页岩气井无因次的产能递减曲线。研究表明,页岩气井达到拟稳态流动时间比常规气井晚,其生产周期长;Langmuir体积对产能递减的影响是线性的,而Langmuir压力的影响是非线性的。
Based on the properties of shale-gas reservoir and its seepage law,a differential equation considering desorption is established.Dimensionless Laplace space flow of a vertical shale-gas well,which determines working pressure,in the center of circular sealed bed is solved.And dimensionless productivity-decline curve is drawn through Stehfest numerical inversion.Result shows that(1) shale-gas well needs more time to reach pseudo steady-state flowing than conventional gas well,resulting in a long production cycle;and(2) Langmuir volume has a linear effect on productivity decline,whereas Langmuir pressure has a non-linear effect.
出处
《天然气勘探与开发》
2011年第2期34-37,81,共4页
Natural Gas Exploration and Development
