Description
Lacking unified technical specifications for sour-resistant drilling tools, the petroleum industry manufactures qualified sour service drill pipes in accordance with standards issued by NACE International and IRP (Industry Recommended Practice) of Canada.
We supply full sizes including 3-1/2″, 4″, 4-1/2″, 5″, 5-1/2″, widely applied in Canadian mountainous oilfields, Sinopec Xinjiang & Sichuan projects, and the ultra-deep well DP5-7/8 (SS110 12.7mm JSHDS55 HRR) of Sinopec Asia. All products have received stable positive feedback from end users.
Our sour-resistant drill pipes adopt special steel grades customized for hydrogen sulfide environments, with exclusive chemical composition, optimized heat treatment processes, controlled yield strength and limited hardness, excellent thermal crack resistance, and strictly regulated alloy element segregation.
NACE Test Standard (Method A)
Test specimens of 6.35mm are loaded to specified stress levels, then immersed in saturated H₂S solution (5% NaCl + 0.5% CH₃COOH glacial acetic acid) at room temperature for continuous 720 hours (30 days).
Compliance Standard: ANSI/NACE Standard TM0177-2005
| Steel Grade | Yield Strength Min/Max (ksi) | Tensile Strength Min/Max (ksi) | Max Hardness (HRC) | Min Impact Energy (ft-lbs) |
|---|---|---|---|---|
| SS-75 | 75/95 | 95/115 | 22 | 50 |
| SS-95 | 95/110 | 105/130 | 25 | 59 |
| SS-105 | 105/120 | 115/140 | 28 | 59 |
| SS-110TJ | 110/125 | 125/145 | 30 | 66 |
