由于真实启动压力梯度λＢ 往往很小 ,若采用做岩心实验的方法求出真实启动压力梯度λＢ,难度通常很大。因此 ,能否通过稳定试井研究求出真实启动压力梯度λＢ,从而为以后的不稳定试井分析打下基础 ,是本文所要研究的课题。1 .基本数学模型　　　　　　　　ｄ2 ｐＤｄｒ2 Ｄ+ 1 Since the real starting pressure gradient λB is often small, it is usually very difficult to obtain the real starting pressure gradient λB using the core experiment. Therefore, whether the real start-up pressure gradient λB can be obtained through the study of stable well testing, so as to lay the foundation for the future unstable well test analysis is the subject to be studied in this paper. Basic Mathematical Model d2 pDdr2 D + 1