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| Place of Origin | CHINA |
| Brand Name | ROSCHEN |
| Certification | API |
| Model Number | 4.75inch 6.75inch ,8inch , 8.25inch,9.5inch |
Non-Magnetic Slick Drill Collars
ROSCHEN Supply Group offers new drill collars. Drill collars comprise about one-third of all product sales for ROSCHEN Supply Group. The new drill collars we provide come from only reputable steel manufacturers and are made to outperform all industry requirements.
In their initial phase of manufacturing, drill collars are solid round bars of 4145 carbon steel. The bars are then quenched and tempered in a heat treatment process to attain the required metallic properties and hardness for drilling. Once heat treatment is complete, a hole is machined through the bar in a coring/honing process known as trepanning. This hole is better known as the ID or the inner diameter. After the trepanning is complete, the ends are machine threaded which makes the connections.
Non-Magnetic Slick Drill Collar 4.750” NC38
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 4 3/4"(4.75") | Connection | NC38 | Bend Stress Ratio | ||
| Nominal ID | 2 11/16"(2.6875") | OD | 4 3/4" (4.75") | ID | 2 11/16"(2.6875") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | 587300lbs | Torsional Strength | 18100 lb/ft | |
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 2 9/16"(2.5625") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 18% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 120,00 psi Minimum | |||||
| 827 Mpa | ||||||
| Yield Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Impact Strength | Above 60J lb/ft charpy V notch | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
Non-Magnetic Slick Drill Collar 6.750” NC50
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 6 3/4"(6.75") | Connection | NC50 | Bend Stress Ratio | ||
| Nominal ID | 3 1/4"(3.25") | OD | 6 3/4" (6.75") | ID | 3 1/4"(3.25") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | Torsional Strength | |||
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 3 1/8"(3.125") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 18% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 120,00 psi Minimum | |||||
| 827 Mpa | ||||||
| Yield Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Impact Strength | Above 60J lb/ft charpy V notch | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
Non-Magnetic Drill Collar 8.000” x 6 5/8” REG Drill Collar
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 8"(8") | Connection | 6 5/8 REG | Bend Stress Ratio | ||
| Nominal ID | 2 13/16"(2.8125") | OD | 8"(8") | ID | 2 13/16"(2.8125") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | Torsional Strength | |||
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 3 11/16"(3.6875") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 20% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Yield Strength | 100,00 psi Minimum | |||||
| 689 Mpa | ||||||
| Impact Strength | Above 60J lb/ft | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
Non-Magnetic Drill Collar 8.250” x 6 5/8” REG
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 8 1/4" (8.25") | Connection | 6 5/8 REG | Bend Stress Ratio | ||
| Nominal ID | 3 1/2"(3.5") | OD | 8 1/4"(8.25") | ID | 3 1/4"(3.25") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | Torsional Strength | |||
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 3 3/8"(3.325") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 20% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Yield Strength | 100,00 psi Minimum | |||||
| 689 Mpa | ||||||
| Impact Strength | Above 60J lb/ft | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
Non-Magnetic Drill Collar 9.500” x 7 5/8” REG
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 9 1/2" 9.5") | Connection | 7 5/8 REG | Bend Stress Ratio | ||
| Nominal ID | 3 "(3") | OD | 9 1/2"(9.5") | ID | 3 "(3") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | Torsional Strength | |||
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 2 7/8"(2.875") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 20% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Yield Strength | 100,00 psi Minimum | |||||
| 689 Mpa | ||||||
| Impact Strength | Above 60J lb/ft | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
Non-Magnetic Drill Collar 9.500” x 7 5/8” REG
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 9 1/2" 9.5") | Connection | 7 5/8 REG | Bend Stress Ratio | ||
| Nominal ID | 3 1/32 "(3.031") | OD | 9 1/2"(9.5") | ID | 3 1/32 "(3.031") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | Torsional Strength | |||
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 2 29/32"(2.9063") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 20% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Yield Strength | 100,00 psi Minimum | |||||
| 689 Mpa | ||||||
| Impact Strength | Above 60J lb/ft | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
Non-Magnetic Drill Collar 9.500” x 7 5/8” REG
| Specification | Tool Joint/Connection Specifications | |||||
| Nominal OD | 9 1/2" 9.5") | Connection | 7 5/8 REG | Bend Stress Ratio | ||
| Nominal ID | 4 "(4") | OD | 9 1/2"(9.5") | ID | 4 "(4") | |
| Material Grade | P530 | Adjusted Weight | Average Length | 31.00 ft | ||
| Grain Size | ASTM | Tensile Strength | Torsional Strength | |||
| Magnetic Permeability | 1.001max | Recommended Make Up Torque | Maximum Make Up Torque | |||
| Drift Size | 3 3/8"(3.325") | Slip Recess | N/A | Elevator Recess | N/A | |
| Hardbanding | None | Fluid Displacement | Fluid capacity | |||
| IPC | None | Inspection Criteria | NS-2 | Elongation | 20% | |
| Chemical Properties | Phosphorus <0.05% | |||||
| Sulphur <0.03% | ||||||
| Average Weight Per Joint | ||||||
| Manufacturing Criteria | API Spec7-1 | |||||
| Drill Collar Capacities | ||||||
| Tensile Strength | 110,00 psi Minimum | |||||
| 758 Mpa | ||||||
| Yield Strength | 100,00 psi Minimum | |||||
| 689 Mpa | ||||||
| Impact Strength | Above 60J lb/ft | |||||
| Hardness(Brinell) | Minimum 285 BHN | |||||
About Drill Collars
Drill collars are extremely heavy-duty industrial tubular used to drill into the ground and are used in conjunction with drill pipe. While drill pipe makes up the majority length of a drill string, drill collars make up only a small amount. For example: a 10,000ft drill string may be comprised of 9,000ft of drill pipe, and only 500ft of drill collars. Much like drill pipe, drill collars are made in 31ft lengths and are screwed together vertically on the drilling rig. In contrast, to drill pipe, drill collars are thick-walled and heavy, with very limited flexibility. Drill collars are used at the bottom of the drill string, just above the drill bit. They are used mainly for weight on the drill bit but also work as a shock absorber to dampen the vibrations and impact forces caused by drilling. There are two main types of drill collars, slick or spiral grooved, however, both styles accomplish the same task. Spiral groove drill collars were introduced in more recent years and are thought to help prevent the drill string from getting stuck in the hole by allowing drilling debris and lubricant to pass more freely around the drill collar.
For more information please contact:
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschen.com ; http://www.roschen.net
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