天然气高速非达西渗流动态产能计算  

Calculation of dynamic productivity of natural gas in high velocity non-Darcy flow

作　　者：崔传智[1] 刘慧卿[1] 耿正玲[1] 郭奇[1] 吕恒宇[1] 

机构地区：[1]中国石油大学,北京102249

出　　处：《特种油气藏》2011年第6期80-82,102,共4页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划“973”计划“温室气体提高石油采收率的资源化利用及地下埋存”(2006CB705804)

摘　　要：真实气体的地下渗流是个不稳定的非线性渗流过程,气井产能受流动规律的影响,并随地层压力及PVT参数的变化而变化。综合考虑天然气高速非达西渗流特征和PVT参数动态特征,建立了外边界封闭气藏中平面径向不稳定渗流数学模型。计算结果表明,考虑高速非达西流和气体PVT参数变化的产能高于达西线性流和PVT参数不变时的产能;计算得到了不同地层压力下不同投产时间的动态IPR曲线,避免了静态IPR曲线中许多不合理的假设,更加符合生产实际。The actual flow of gas underground is an unsteady nonlinear process and the productivity of gas wells is affected by the flow patterns and it changes with the change of formation pressure and PVT parameters.In this paper,a mathematical model for the two dimensional radial unsteady flow in external boundary closed gas reservoirs was established considering the high velocity non-Darcy flow characteristics of natural gas and the dynamic features of PVT parameters.The calculation results indicated that the productivity considering the high velocity non-Darcy flow and the changes of PVT was higher than that of Darcy linear flow with constant PVT parameters.Dynamic IPR curves at different times under different formation pressures were also obtained from the calculations,eliminating unreasonable assumptions in the static IPR curves and conforming better to the actual production.

关 键 词：高速非达西流 动态IPR曲线 数学模型 真实气体PVT参数 气井产能 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论]