高钢级绳索取心钻杆管材残余应力的初步研究

有观点认为管材的残余应力是绳索取心钻杆非正常损坏的诱因之一。据此采用环切法对不同热处理和矫直工艺的冷拔绳索取心管材制造过程中的残余应力进行了检测比对，认为冷拔管材制造环节产生的残余应力是存在的，也是可控的。只要制造工艺措施得当，可以将高钢级合金管材的残余应力控制在可接受范围内；合格管材出厂时存在较高残余应力造成的钻杆折断等事故较为罕见。应从管材制造、钻杆加工、现场使用等方面入手，努力降低钻杆断裂事故。

Preliminary Study on Residual Sress in High Grade Steel Wire-line Coring Pipe

There is a viewpoint saying that the residual stress in pipe is one of the causes of non-normal damage of wire-line coring drill pipe, based on which, the detection comparison was made on the residual stress in the manufacturing process of cold drawing wire-line coring pipe with different heat treatment and straightening processes by ring cutting method. The residual stress produced in cold drawing pipe manufacturing process is thought to be in existence but is controllable. With appropriate manufacturing measures, the residual stress in high grade alloy pipe can be controlled in an acceptable range, and rare qualified pipes break occur due to the residual stress. The pipe breaking accident should be reduced by paying attention in pipe manufacturing, drill pipe processing and the field application.