Abstract: In this article a three dimension diagnostic model for sucker rod pumping systems of directional well has been developed,based on the farce analysis of rod,fluid and tubing.A numerical solution has been given by using an implicit finite difference method with the help of computer.Performances of some directional wells in Sazhong oil field have been diagnosed and the results are consistent with those of pumping tests.

摘要： 根据对油杆、液柱、油管的受力分析,建立了杆柱、液柱、管村饭个运动系统的定向井三维诊断数学模型利用隐式差分法求得了数值解利用微机对萨中油田部分定向井进行了诊断,预测泵功图的泵况分析结果与作业检泵结果相符.

关键词: 定向井, 泵况诊断, 泵功图, 隐式差分格式