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1.前言某钻杆于正常钻进时发生断裂失效。为查清断裂原因,笔者对断裂样品进行了分析。该钻杆为新钻杆,管体钢级为S135,纯钻时间为70小时。
1. Foreword A drill pipe failure occurred during normal drilling. In order to find out the reason of fracture, the author analyzed the fracture samples. The drill pipe is a new drill pipe, pipe steel grade S135, pure drilling time is 70 hours.