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API 5DP is the drill pipe specification by the American Petroleum Institute, covering grades E75, X95, G105, and S135. It defines dimensions, mechanical properties, and testing requirements.
Friction welding is a key technology in drill pipe manufacturing. It joins the pipe body and tool joint through solid-state bonding via rotational friction heat, ensuring high strength and consistent quality.
Drill pipe grades range from E75 to S135 with increasing yield strength. Shallow wells can use E75, while deep high-pressure environments require S135. Selection depends on depth, torque, and geology.
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