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Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drill string in tension. Drill collar can be divided into standard drill collar, spiral drill collar and non-magnet drill collar.


Standard Drill Collar
Ordering Instructions
1. Specify the specification of drill collar: OD 
2. Specify the required overall length (If non-standard)
3. Specify the required ID (If non-standard)
4. Specify the specifications of thread connection: stress relief groove, rebuild benchmark or low-torque structure.
5.Elevator groove, slip groove, hardband or inner coating (Optional)
6. Cold rolling for thread root or stress relief groove, or thread makeup out requirements. 

Standard Drill Collar
Ordering Instructions
1. Specify the specification of drill collar: OD 
2. Specify the required overall length (If non-standard)
3. Specify the required ID (If non-standard)
4. Specify the specifications of thread connection: stress relief groove, rebuild benchmark or low-torque structure.
5.Elevator groove, slip groove, hardband or inner coating (Optional)
6. Cold rolling for thread root or stress relief groove, or thread makeup out requirements. 

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