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在小口径金刚石钻进中，因钻杆的断裂而带来孔内事故造成时间和经济上的损失是时有发生的。φ50内丝钻杆（不加厚型）与φ50外丝钻杆（内加厚型）在施工中断裂的情况是相似的，按其断裂部位划分，可分为三大类：1．钻杆中部折断；2．在螺纹前端碎裂；3．接近螺纹终点部成环状断裂。几年来，我队在钻探施工中（原开动钻机3—5台，现开动钻机9台，均采用小口径金刚石钻进，口径为φ76、φ56两级）所发生的钻杆断裂，按其发生的次数来看，第一、二种断裂类型很少发生，而较多出现的则是第三种类型（占90％以上）。因此，减少螺纹终点部位的
In the small diameter diamond drilling, due to the fracture of the drill pipe caused by the hole caused by the time and economic losses are frequent occurrences. φ50 inner drill pipe (not thick) and φ50 outer drill pipe (thick type) in the construction of the case of fracture is similar, according to the fracture site division, can be divided into three categories: 1. Broken middle drill pipe; 2. Fragmentation at the front of the thread; 3. Near the end of the thread into a ring fracture. Over the past few years, my team in drilling construction (the original rig 3-5 sets of drilling rig, drilling rig is now 9, are using small-diameter diamond drilling, caliber φ76, φ56 two) occurred by the drill rod fracture, according to its occurrence Of the number of view, the first, two types of faults rarely occur, while the more is the third type (accounting for more than 90%). Therefore, reduce the thread end point