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钻井工艺技术的迅速发展 ,对钻杆的结构、技术性能和使用寿命提出了更高的要求。近期以来 ,国外又研制出适用于短半径水平井钻进的钛合金钻杆和适用于高温井的隔热钻杆。1 .钛合金钻杆在老井内侧钻短半径小井眼水平井时 ,钻杆要通过的曲率半径小于 1 8ｍ ,所承受的应力增加。疲
The rapid development of drilling technology has put forward higher requirements on the structure, technical performance and service life of the drill pipe. Recently, it has also developed a titanium alloy drill pipe suitable for drilling in short radius horizontal wells and an insulating drill pipe suitable for use in high temperature wells. When the titanium alloy drill pipe is used to drill short radius small borehole horizontal well inside the old well, the radius of curvature that the drill pipe passes is less than 18m, and the stress to be borne is increased. tired