Drill pipe is one of the key components of all drilling rigs. It is applied in horizontal directional drilling pipeline installation projects and requires high strength due to harsh operating conditions.

Working Principle of Drill Tubes
The drilling assembly is connected to the drill pipe to transmit power. Generally, the drill string consists of drill collars, drill pipes, stabilizers, special connectors and kelly bars. Threads are machined on both ends of drill pipes to connect the drilling rig and downhole tools at the bottom. Drill pipes must withstand external pressure, torsion and operate under severe vibration.

Common Standards
API SPEC 5DP Specification for Drill Pipe
API BUL 5C2 Performance Properties of Casing, Tubing and Drill Pipe
SY/T 6417 Performance Properties of Casing, Tubing and Drill Pipe
SY/T 6896.2 Petroleum and natural gas industries — Technical specification for special tubular products — Part 2: Drill pipes for directional crossing

Main Steel Grades and Properties