API Certified Roller Kelly Bushings from China Suppliers - High-Performance Factory-Engineered Solutions
Roller Kelly Bushing Specifications
1. Light Duty Roller Kelly Bushing
| Model | 20-MDP | 17-MDP | LDS |
|---|---|---|---|
| Max Torque | 13729 N·m (10126 ft·lbf) | - | - |
| Drive Type | Square | - | - |
| Square Kelly Size | 63.5-133.35 mm (2 1/2-5 1/4 in) | - | - |
| Hexagonal Kelly Size | 76.2-107.95 mm (3-4 1/4 in) | - | - |
| Dimensions | 458×458×700 mm (18×18×27.5 in) | 508×508×700 mm (20×20×27.5 in) | - |
| Weight | 460 kg (1012 lb) | 340 kg (750 lb) | 400 kg (808 lb) |
2. Medium-Duty Roller Kelly Bushing
| Model | 20-HDP | MDS |
|---|---|---|
| Max Torque | 13729 N·m (10126 ft·lbf) | - |
| Drive Type | Square | Pin Shaft |
| Square Kelly Size | 63.5-133.35 mm (2 1/2-5 1/4 in) | - |
| Hexagonal Kelly Size | 76.2-107.95 mm (3-4 1/4 in) | - |
| Dimensions | 493×493×696 mm (19.4×19.4×27.4 in) | 510×510×720 mm (20×20×28.3 in) |
| Weight | 670 kg (1470 lb) | 420 kg (924 lb) |
3. Heavy Duty Roller Kelly Bushing
| Model | HDS | 27-HDP |
|---|---|---|
| Max Torque | 32365 N·m (23871 ft·lbf) | 22555 N·m (16636 ft·lbf) |
| Drive Type | Square | Pin Shaft |
| Square Kelly Size | 76.2-152.4 mm (3-6 in) | 63.5-133.35 mm (2 1/2-5 1/4 in) |
| Hexagonal Kelly Size | 76.2-152.4 mm (3-6 in) | 76.2-107.95 mm (3-4 1/4 in) |
| Dimensions | 630×630×740 mm (24.8×24.8×29.1 in) | 630×630×780 mm (24.8×24.8×30.7 in) |
| Weight | 700 kg (1540 lb) | 730 kg (1610 lb) |
Roller Kelly Features
Compatible with a wide range of Square and Hexagonal Kelly sizes.
Quad-roller precision design, four induction-hardened rollers reduce frictional resistance by up to 68% compared to solid bushings.
Available with various standard connection types to meet different rig configurations.
In a Middle Eastern rig operation, heavy duty pin drive bushings reduced torque fluctuations by 35%, resulting in a 50% increase in Kelly service life compared to standard bushing systems.
Frequently Asked Questions (FAQ)
What types of Kellys are compatible with these bushings?
The Roller Kelly Bushings are versatile and compatible with a wide range of both Square and Hexagonal Kelly sizes.
How does the quad-roller design improve drilling efficiency?
The quad-roller precision design utilizes four induction-hardened rollers, which reduces frictional resistance by up to 68% when compared to traditional solid bushings.
Are the connections on the Roller Kelly Bushings API compliant?
Yes, the bushings are available with various standard connection types that are fully API compliant to meet different rig configurations.
What is the maximum torque capacity of the Heavy Duty Roller Kelly Bushing?
The Heavy Duty HDS model can handle a maximum torque of up to 32,365 N·m (23,871 ft·lbf), while the 27-HDP model handles up to 22,555 N·m (16,636 ft·lbf).
What drive types are available for these bushings?
Depending on the specific model and duty rating, the Roller Kelly Bushings are available in both Square and Pin Shaft drive types.
Can these bushings extend the service life of a Kelly?
Yes. In a Middle Eastern rig operation, the use of heavy-duty pin drive bushings reduced torque fluctuations by 35%, which resulted in a 50% increase in Kelly service life compared to standard bushing systems.