Drill pipe

Standards: API 5DP, API Specification 7-1
API 5DP Grade: DZ50, E75, R780, X95, G105, S135
Size range: 2 3/8", 2 7/8", 3 1/2" 4", 4 1/2" 5", 5 1/2" to 6 5/8"
Outside diameter range (mm): 60.3 mm, 73 mm, 88.9 mm, 101.6 mm, 114.3 mm, 127 mm, 139.7 mm
Thickness range: 6.5mm to 12.7mm, or cutting thickness
Connection thread NC26, NC31, NC38, NC40, NC46, NC50, 5 1/2FH.6 5/8FH.
Internal upsetting IU, EU, IEU
Length R1, R2, R3

To enhance the strength of the connection between the tube body and the joint, the tube body is thickened at both ends. The commonly used forms of thickening are internal thickening, external thickening, and internal and external thickening. According to the American Petroleum Institute (API-American Petroleum Institute), drill pipe is divided into three categories according to its length:

The first category, 5.486~6.706m (18~22ft);

The second category, 8.230~9.144m (27~30ft);

The third category, 11.582~13.716m (38~45ft);

The three most commonly used drill pipe sizes are 88.9 (3.5in), 114.3 (4in), and 127.0mm (5.5in).