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钻杆是石油管中一个性能要求较高的品种。钻杆具有加厚的端部,内外加厚的φ127mm钻杆,其加厚端厚度约为管体的两倍。钻杆在作业时所受的力有:a)因钻杆柱本身重量所产生的拉应力;b)快速旋转的钻杆,因井拐折而引起的反复拉伸与弯曲交变应力,这种应力造成疲劳破坏;c)旋转的钻杆在钻进过程中所产生的扭转应力;d)因与岩石撞擦而产生的冲击载荷和对工具接头的磨损。此外,钻杆工作时还受到周围介质的腐蚀。钻杆在使用过程中产生的最普遍的破坏是疲劳破坏(包括机械刻痕所引起的疲
Drill pipe is a pipe in a higher performance requirements of the species. Drill pipe with thickened ends, inside and outside thickened φ127mm drill pipe, the thickened end of the thickness of about twice the body. Drill pipe in the operation of the force are: a) due to the weight of the drill string itself caused by the tensile stress; b) rapid rotation of the drill pipe, due to the inflection of wells caused by repeated tensile and bending alternating stress, which Fatigue caused by stress of different kinds; c) torsional stress caused by rotating drill pipe during drilling; d) impact load and abrasion of joint of the tool due to impact with rock. In addition, drill pipe work is also subject to the surrounding medium of corrosion. Drill pipe in the use of the most common during the destruction of fatigue damage (including mechanical nicks caused by fatigue