利用气井压力恢复资料求产能方程和排泄半径

Determining Deliverability Equation and Drainag Radius Using Pressure Buildup Data of Gas well

 李晓平

Li Xiaoping

西南石油学院石油工程学院

Petroleum Engineering Department of Southwest Petroleum institute , Sichuan 637001 , P. R. China

气井的产能方程是求取气井无阻流量的重要方程,通常由系统试井获得。对于低渗透气藏,用常规的系统试井方法确定二项式产能方程往往比较困难。从不稳定渗流理论出发,得出了利用压力恢复资料求气井二项式产能方程的方法,由该方程还可以计算气井的排泄半径。经实例分析,本方法可行、有效。

Deliverability equation of gas well is an important equation for solving absolution open flow(AOF) , AOF is general obtained by method of flow-after-flow test , it is difficult to determine binomial deliverability equation with conventional back pressure test for low permeability gas reservoirs. On the basis of transient flow theory , this paper derives method of determining binomial deliverability equation by using pressure buildup data of the well , at the same time , drainage radius of gas well can be calculated with binomial deliverability equation.