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石油钻井需要使用大量的钻杆。在钻进过程中,钻杆要受拉、压、弯、扭、冲击诸种应力的综合作用,还要经受夹带大量泥沙的高压泥浆等的冲刷和并壁对它的磨损,因此每年都有成批的钻杆需要修理,还有成批的钻杆报废。过去我们使用的钻杆大部分是有细扣钻杆,这种钻杆在细丝扣处是个薄弱环节,由于应力集中的关系容易产生径向裂纹,甚至造成严重井下事故。有的在细扣处由于密封不好受高压泥浆穿刺而损坏,
Oil drilling requires the use of a large number of drill pipe. During the drilling process, the drill pipe is subjected to the combined effect of various stresses such as pulling, pressing, bending, twisting and impact as well as the erosion of the high-pressure mud entrained with a large amount of sediment and the wear of the drill pipe on the wall. Therefore, There are a lot of drill pipe needs to be repaired, there are a lot of drill pipe scrapped. In the past, most of the drill rods we used were fine-buck drill rods. Such drill rods were a weak link in the thin wire buckles. Radial cracks were easily generated due to the stress concentration and even resulted in serious downhole accidents. Some fine buckle at the seal due to poor high-pressure mud puncture and damage,