DRILL COLLAR
Drill Collar is one of the most important components of the drill string, which providing pressure on drill bits.
The production and inspection standard is API 7, API 7-1. The material of the drill collar can be AISI 4145 H or Non-magnetic material.
Landrill provide you all kinds of drill collars like Slick drill collars and Spiral drill collars, OD sizes from 3 1/8”-11”, Length from 10’-31’
Mechanical Property of Slick and Spiral drill collars:
| OD Range (in) | Yield Strength (MPa) | Tensile Strengt h (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 |
Mechanical Property of Non-mag Drill Collars:
| OD Range (in) | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) | Hardness (HB) | Impact Test (J) |
| 3 1/8 ~ 6 3/4 | ≥758 | ≥827 | ≥18 | ||
| 7 ~ 11 | ≥689 | ≥758 | ≥20 |
Other drilling string products:
| PDC Drill bits | Stabilizer | Rotary Reamer |
| Mud Motor | Drill Collar | Heavy Weight Drill Pipe |
| Hole Opener | Drilling jar | Jar Intensifier |
| Shock Absorber | Slide Reamer | Variable Gauge Stabilizer |