Diagnosis results of more than 130 oil wells indicate that the modified Gibbs equation can accurate1y compute the downhole dynamometer diagram and its coincidence rate is more than 80 %.

• 通过对130余井次应用玻璃钢抽油杆的油井进行诊断分析，修正的吉布斯方程能准确地解出井下泵示功图，符合率在80%25以上。