钻杆是一种尾部带有螺纹的钢管，用于连接钻机地表设备和位于钻井底端钻磨设备或底孔装置。钻杆的用途是将钻探泥浆运送到钻头，并与钻头一起提高、降低或旋转底孔装置。钻杆必须能够承受巨大的内外压、扭曲、弯曲和振动。在油气的开采和提炼过程中,钻杆可以多次使用。钻杆分为方钻杆、钻杆和加重钻杆三类。连接次序为方钻杆(1根)+钻杆(n根，由井深决定)+加重钻杆( n根，由钻具组合设计决定)详细介绍了钻杆的分类、钻杆接头、钻杆规格以及钻杆的钢级与强度。

采用标准:API Spec 5DP-2009钻杆产品规范

SY/T5561-2008摩擦焊接钻杆

钻杆接头和管体严格按上述标准进行选材，对焊区工序在C-132-J摩擦焊机上完成，并对焊接部位进行焊后退火及淬火，回火调质热处理。各项性能指标和技术要求达到相关标准的要求。

Drill pipe is a kind of steel pipe with thread at the tail. lt is used to connect the surfaceequipment of drilling rig and the drilling and grinding equipment or bottom hole device atthe bottom of drilling rig.The purpose of the drill pipe is to transport drilling mud to the bitand to raise, lower or rotate the bottom hole device together with the bit. Drill pipe must beable to withstand tremendous internal and external pressure, distortion, bending andvibration.In the process of oil and gas exploitation and refining, drill pipe can be usedmany times.Drill pipe can be divided into three categories: square drill pipe, drill pipe andheavy drill pipe.The order of connection is square drill pipe (1)+drill pipe (n, determinedby well depth)+weighted drill pipe (n, determined by drill tool combination design).Theclassification of drill pipe, drill pipe joints, drill pipe specifications and steel grade andstrength of drill pipe are introduced in detail.

Standard: API Spec 5DP-2009 Drill Pipe Product SpecificationFriction Welded Drill Pipe SY/T 5561-2008

The drill pipe joints and pipes are selected strictly according to the above standards.The welding process is completed on C-132-J friction welding machine.The weldingparts are annealed and quenched after welding,tempered.All performance indicators andtechnical requirements meet the requirements of relevant standards.