| 冷组装铝合金钻杆螺纹副力学性能测试及失效分析 |
| 投稿时间：2017-04-17 修订日期：2017-05-15 点此下载全文 |
| 引用本文：刘宝昌,李闯,张弛,等.冷组装铝合金钻杆螺纹副力学性能测试及失效分析[J].钻探工程,2017,44(6):13-17.LIU Bao-chang,LI Chuang,ZHANG Chi,et al. Mechanical Performance Test and Failure Analysis on Cold Assembled Aluminum Alloy Drill Pipe Thread Pair[J]. Drilling Engineering, 2017,44(6):13-17. |
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| 基金项目:国家国际科技合作专项“深部油气钻探用高性能钻具系统关键技术合作研究”（编号：2013DFR70490）；吉林省科技厅重点项目“深井油气钻探用铝合金钻杆关键制造技术”（编号：20130206023GX）；吉林省自然科学基金项目（学科布局项目）“铝合金钻杆在钻井液中的腐蚀行为与腐蚀机理研究”（编号：20170101159JC） |
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| 中文摘要:与传统的钢制钻杆相比，铝合金钻杆具有密度小、比强度高、无磁等优点，因此在深井与超深井钻井作业中具有较大优势。在实际使用中，铝合金钻杆两端需要通过钢接头之间的螺纹来实现拧卸钻杆，而铝合金杆体与钢接头还需要过盈装配以实现紧固连接 。以液氮为冷源，对50 mm的7075铝合金钻杆管体与钢接头进行了“冷组装”过盈装配，铝合金管体与钢接头之间的过盈量分别为0.10、0.15、0.20 mm。对组装后两端带钢接头的铝合金钻杆分别进行了拉伸和扭转试验，评价了铝合金管体与钢接头连接的可靠性，对断裂试样的断口进行了宏观与微观分析，阐述了其断裂机理。结果表明，采用“冷组装”方式可以实现铝合金管体与钢接头的过盈装配，其中过盈量为0.15 mm时，带钢接头的铝合金钻杆综合性能较优，可以承受较大的抗拉强度极限和抗扭极限，其断裂方式为脆性断裂。 |
| 中文关键词:铝合金钻杆 冷组装 过盈配合 断裂机理 |
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| Mechanical Performance Test and Failure Analysis on Cold Assembled Aluminum Alloy Drill Pipe Thread Pair |
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| Abstract:Compared with the traditional steel drill pipe, aluminum alloy drill pipe has the advantages of low density, high specific strength, non-magnetic and etc., so it has great advantage in deep and ultra-deep drilling operations. In practice, for aluminum alloy drill pipe, the connecting and dismounting at two ends are realized by the screws on the steel joints, while the fasten connection of aluminum alloy drill pipe and steel joint is realized by interference fit. With the cooling source of liquid nitrogen, 50mm 7075 aluminum alloy drill pipe and steel joints were connected with interference by “cold assembly”, the magnitude of interference between aluminum alloy drill pipe and steel joints were 0.1, 0.15 and 0.2mm respectively. The tensile and torsion tests were carried out on the assembled aluminum alloy drill pipe (both ends with steel joints). In this paper, the reliability of the connection between aluminum alloy drill pipe and steel joint was evaluated, and the fracture surface of specimen are analyzed macroscopically and microscopically to elaborate the fracture mechanism. The results show that the interference assembly of aluminum alloy drill pipe and steel joint can be realized by “cold assembly”. The aluminum alloy drill pipe with magnitude of interference of 0.15mm has better comprehensive properties, and it can bear larger tensile strength and anti-torsion limits, and the fracture mode is brittle fracture. |
| keywords:aluminum alloy drill pipe cold assembly interference fit fracture mechanism |
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