The primary difference between New and Premium drill pipe lies in their usage history and remaining wall thickness (RWT). While both are considered high-quality and safe for drilling, they have different performance limits and identification markings.
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New Drill Pipe
Definition: Pipe that has come directly from the manufacturing mill and has never been used in a wellbore.
Remaining Wall Thickness (RWT): It possesses 100% of its original nominal wall thickness (subject to minor manufacturing tolerances).
Identification: Typically has no color bands. It is identified by the factory "mill stencil" (painted text) and stamped markings on the tool joints.
Performance: Offers maximum tensile strength, torsional yield, and internal pressure resistance.
Application: Primarily used for extreme environments such as ultra-deep wells, deepwater drilling, or High-Pressure High-Temperature (HPHT) wells where the safety margin is critical.
Premium Drill Pipe
Definition: Used pipe that has undergone rigorous Non-Destructive Testing (NDT)-such as ultrasonic or electromagnetic inspection-to verify it is still structurally sound.
Remaining Wall Thickness (RWT): Must retain at least 80% of its original nominal wall thickness. If the wall thickness falls below 80%, it is downgraded to Class 2.
Identification: The industry standard marking is two white bands.
Performance: Strength is approximately 80% of a new pipe. While thinner, it is still robust enough for most standard drilling operations.
Application: This is the "industry workhorse." The vast majority of standard onshore and offshore drilling projects use Premium pipe because it provides a proven level of safety at a much lower cost than buying new.
Remaining Wall Thickness (RWT)
New Drill Pipe: Has 100% of its original nominal wall thickness (subject to a small manufacturing tolerance of about -12.5%). It is at its maximum structural strength.
Premium Drill Pipe: Has been worn down by friction against the borehole wall but must retain at least 80% of its original wall thickness. If it falls to 79%, it is no longer "Premium."
Usage History
New: Straight from the manufacturing mill. It has never been used downhole.
Premium: "Used" pipe. It has been used in drilling operations but has undergone rigorous non-destructive testing (NDT)-such as ultrasonic or electromagnetic inspection-to prove it still meets the 80% threshold.
Identification (Color Bands)
New: Typically has no color bands. It is identified by the mill stencil (text painted on the pipe) and stamped markings on the tool joint.
Premium: Identified by two white bands painted on the pipe body (usually near the center or the tool joint).
Mechanical Performance
Because Premium pipe is thinner than New pipe, its mechanical limits are lower:
Tensile Strength: Premium pipe can support less weight than New pipe before stretching or snapping.
Torsional Yield: Premium pipe has a lower torque limit, meaning it is more susceptible to "twisting off" under high stress.
Internal Pressure: New pipe has a higher burst rating compared to Premium.
Comparison Table
| Feature | New Drill Pipe | Premium Drill Pipe |
| Wall Thickness | 100% | 80% to 99% |
| Condition | Unused / Mint | Used but inspected |
| Color Code | None (Mill Stencil) | 2 White Bands |
| Strength | Maximum (100%) | Reduced (approx. 80% of New) |
| Cost | Highest | More economical |
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FAQ
What is premium drill pipe?
Premium drill pipe refers to drill pipe manufactured with enhanced threading specifications that exceed standard API requirements.
How to identify S grade and G grade drill pipe?
To distinguish S135 and G105 drill pipes per API 5DP: S135 is marked "S135" and used for ultra-deep, high-stress wells (e.g., horizontal drilling), with min yield strength ≥135,000 psi and tensile strength ≥145,000 psi, requiring SSC testing (NACE TM0177). G105 is marked "G105" for medium-depth wells (≤6,000m), with min yield ≥105,000 psi and tensile ≥115,000 psi, no mandatory anti-sulfur tests. (58 words)
