Drill pipe is a steel pipe with indulge grain on the tail, which is used to connect the surface equipment of the drilling rig to the drilling and grinding equipment or bottom hole device located at the bottom of the drilling rig. The purpose of the drill pipe is to transport drilling mud to the bit and to lift, lower or rotate the bottom hole device with the bit. The drill pipe must be able to withstand tremendous internal and external pressure, distortion, bending and vibration. In the process of oil and gas extraction and refining, drill pipe can be used many times.

The clean pipe and raw steel pipe are made into drill pipe after several processing steps. First of all, through the processing of the steel pipe thickening process, the outer surface of the steel pipe is curved inward, and the wall of the steel pipe is thickened. Next, the thread is machined and plated with copper to increase strength. A non-destructive quality control test is then carried out, followed by the welding of the pipe body joint. Then, the pipe will undergo welding heat treatment and welding final treatment to eliminate welding residual stress. Before the finished drill pipe is painted and packaged, the finished steel pipe is subjected to a number of other tests, including hardness testing, pressure testing and non-destructive testing.

The length of the drill pipe is usually about nine meters.