Drill Collars – API 7-1 / 7-2
Wide range of API Drill Collars, manufactured from API 7-1 / 7-2 compliant material.
Specifications: API SPEC 7-1 / 7-2
- Available sizes: 3 1/8” ~ 11”.
- Available material grades: AISI 4145H mod & Non-Mag.
- Features - Body:
- Slick Body / Spiral Body
- Elevator recess
- Slips Recess
- Optional Hard Banding
- Features - Connections:
- SRG / BB
- Cold Roll in thread roots
- Protection: Thread storage compound, with plastic thread protector installed.
Note: (lower Magnetic permeability, high strength mechanical properties and outstanding resistant to stress corrosion cracking and resistant to galling.)
| Technical specifications and parameters | ||||
| OD | ID | Length | Style of connection | BSR (Bend Strength Ratio) |
| 3 1/8" | 1 1/4" | 30ft | NC23-31 | 2.57:1 |
| 3 1/2" | 1 1/2" | 30ft | NC26-35(2 3/8"IF) | 2.42:1 |
| 4 1/8" | 2" | 30ft | NC31-41(2 7/8"IF) | 2.43:1 |
| 4 3/4" | 2" | 30ft | NC35-47 | 2.58:1 |
| 5" | 2 1/4" | 30ft | NC3850(3 1/2"IF) | 2.38:1 |
| 6" | 2 1/4" | 30ft/31ft | NC44-60 | 2.49:1 |
| 6 1/4" | 2 1/4" | 30ft/31ft | NC44-62 | 2.91:1 |
| 2 13/16" | 30ft/31ft | NC46-62(4"IF) | 2.63:1 | |
| 6 1/2" | 2 1/4" | 30ft/31ft | NC46-65(4I"F) | 2.76:1 |
| 2 13/16" | 30ft/31ft | NC46-65(4I"F) | 3.05:1 | |
| 6 3/4" | 2 1/4" | 30ft/31ft | NC46-67(4I'F) | 3.18:1 |
| 2 13/16" | 30ft/31ft | NC50-67(4 1/2"IF) | 2.37:1 | |
| 7" | 2 1/4" | 30ft/31ft | NC50-70(4 1/2"IF) | 2.54:1 |
| 2 13/16" | 30ft/31ft | NC50-70(4 1/2"IF) | 2.73:1 | |
| 7 1/4" | 2 13/16" | 30ft/31ft | NC50-72(4 1/2"IF) | 3.12:1 |
| 7 3/4" | 2 13/16" | 30ft/31ft | NC50-77 | 2.70:1 |
| 8" | 2 13/16" | 30ft/31ft | NC50-80 | 3.02:1 |
| 8 1/4" | 2 13/16" | 30ft/31ft | 6 5/8"REG | 2.93:1 |
| 9" | 2 13/16" | 30ft/31ft | NC61-90 | 3.17:1 |
| 9 1/2" | 3" | 30ft/31ft | 7 5/8"REG | 2.81:1 |
| 9 3/4" | 3" | 30ft/31ft | NC70-97 | 2.57:1 |
| 10" | 3" | 30ft/31ft | NC70-100 | 2.81:1 |
| 11" | 3" | 30ft/31ft | 8 5/8"REG | 2.84:1 |
| Mechanical Properties | |||||
| OD Range | Yield Strength(MPa) | Tensile Strength(MPa) | Elongation (%) | Hardness (HB) | Impact Test(J) |
| 3-1/8" 6-3/4" | ≥758 | ≥965 | ≥13 | 285～341 | ≥54 |
| 7" - 11" | ≥689 | ≥930 | ≥13 | 285～341 | ≥54 |
More information available on request.
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