直连绳索取心钻杆分区热处理技术研究

Research on zone heat treatment technology of straight-connected wire-line core drill pipe

摘要:

为了提高绳索取心钻杆的性能，对直连绳索取心钻杆的受力情况、结构特点以及传统处理工艺进行分析，提出了分区热处理的工艺。通过对两端进行热加工处理，使钻杆中间管体区域和两端热处理螺纹区域性能出现差异，提高两端综合强度的同时改善螺纹部分的受力状态，可使钻杆柱既具有高强度又兼具柔性，大幅提高钻杆机械性能以及耐磨性。其中调质硬度HRC33~38能在保证管体延伸率与正火、回火基本一致的情况下，强度提高37.7%，硬度提高40%，抗冲击性提高46.7%。调质硬度HRC38~42时，材料的耐磨性提高9.1%。更适合全液压钻机施工及深孔钻进，为钻探施工提供了钻机、钻杆配套性的优选方案。

Abstract:

In order to improve the performance of the wire-line core drill pipe， the stress， structural characteristics and traditional treatment technology of the straight-connected wire-line core drill pipe were analyzed， and a zonal heat treatment process was proposed. Through the heat treatment of both ends， the heat treatment performance of the middle pipe body area and the thread area at both ends was different， and the comprehensive strength of both ends was improved while the stress state of the thread part was improved. It can make the drill pipe string have both high strength and flexibility， and greatly improve the mechanical properties and wear resistance of the drill pipe. The quenching and tempering hardness HRC33~38 can increase the strength by 37.7%， the hardness by 40% and the impact resistance by 46.7% under the condition that the elongation of the pipe body is basically the same as that of normalizing and tempering. When the quenching and tempering hardness is HRC38~42， the wear resistance of the material is increased by 9.1%. It is more suitable for full hydraulic drilling rig construction and deep hole drilling， and provides the optimal scheme for drilling rig and drill pipe matching.