A drill pipe is a seamless steel pipe that composes around 95% of the length of a drill string. For clarity, a drill string is what is used to actually drill into the ground to extract resources. The drill pipe is hollow, which allows drilling fluid to flow freely throughout the pipe and the pumping process to be completed successfully.
Drill pipes are steel tubulars fitted with threaded ends called tool joints, which are commonly used in tension in the top part of the drill string to pump fluid and transmit torque to the bit.
Mechanical Properties
Grade | E-75 | X-95 | G-105 | S-135 |
Yield Strength (minimum psi) | 75,000 | 95,000 | 105,000 | 135,000 |
Yield Strength (maximum psi) | 105,000 | 125,000 | 135,000 | 165,000 |
Tensile Strength (minimum psi) | 100,000 | 105,000 | 115,000 | 145,000 |
Chemical composition
Pipe body | Phosphorus max. % | Sulfur max. % |
Pipe body grade E | 0.030 | 0.020 |
Pipe body grades X, G and S | 0.020 | 0.015 |
Tool joint | 0.020 | 0.015 |
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