高强耐热铝合金钻杆材料优选

Optimization of high strength and heat resistant aluminum alloy drill rod materia

摘要:

铝合金钻杆的使用性能是制约深部钻探技术发展的“瓶颈”。本文综合考虑孔内工况因素和钻杆性能因素，以钻柱组合设计为基础准则，从特深孔钻探工程技术需求出发，开展了高强耐温铝合金钻杆材质选择和评价的试验研究。试验结果表明：2219铝合金固溶时效制度分别为535 ℃/1 h、165 ℃/20 h，2618铝合金固溶时效制度分别为530 ℃/1 h、200 ℃/20 h；2219铝合金在高温长时间暴露后的室温力学性能优于2618铝合金，在高温瞬时条件下的力学性能劣于2618铝合金；2219铝合金中含有Zr，该元素在热暴露过程中起到减缓溶质扩散速率的作用，这对提高热暴露后的剩余强度是有利的。

Abstract:

The performance of aluminum alloy drill rods is the bottleneck of the development of deep drilling technology. With the design of the drill string structure as the basis and in view of engineering requirements of ultra-deep hole drilling, the selection and evaluation of high strength and heat resistant aluminum alloy drill rod material were studied. The results showed that: the solution aging of 2219 aluminum alloy was 535℃/1h, 165℃/20 h, 2618 was 530℃/1h, 200℃/20h, respectively. The mechanical properties of 2219 aluminum alloy were better than 2618 aluminum alloy after long time heat exposure at ambient temperature and worse than 2618 aluminum alloy at transient high temperature. The element Zr in 2219 aluminum alloy can slow down the solute diffusion rate in the process of heat exposure, and it is beneficial to improve the residual strength after heat exposure.