苏402井是华北油田6071钻井队钻探的一口五千多米的超深井。一九八四年八月在奥陶系石灰岩地层进行裸眼测试,发生严重的卡钻事故,处理21.7天,经济损失25万元。虽然时过几年,其教训是深刻的,现将该井情况做以总结分析,供测试人员在现场工作时能够吸取教训,引以为戒。 Well Su 402 is a ultra-deep well of more than 5000 meters drilled by 6071 drilling team of Huabei Oilfield. In August 1984, the naked eye test was carried out on the Ordovician limestone stratum, causing a serious stuck pipe accident. The accident lasted for 21.7 days and the economic loss was 250,000 yuan. Although a few years later, the lesson is profound. Now we do a summary analysis of the well conditions so that testers can learn lessons when working on the site.