R & D and Application of Φ73 mm Friction-welded All Titanium Alloy Drill Pipe

Elaborated here in the article is the R & D process of the Φ73 mm friction-welded all titanium alloy drill pipe. Also described in detail are the forging technology for the pipe body and the application effectiveness of the said drill pipe. Thanks to a certain special forging process for the pipe body and threading process，the Φ73 mm friction-welded all titanium alloy pipe featuring consistent performance and long service life is developed. The drill pipe has been successfully used in the T4326CH2 ultra short radius horizontal well of Tahe Oild Field，resulting in a highest build-up rate up to 55°/30 m，which has set three records，i.e.，the first largest well borehole curvature，the least side drilling footage and the shortest side drilling time in the Northwest China Work Area.