Description
ELITE Spiral Drill collar manufacturer
In modern oil and gas drilling, drill collars are indispensable components of the Bottom Hole Assembly (BHA). They provide the necessary weight on bit (WOB), ensure proper directional control, and minimize vibrations during drilling. Among them, spiral drill collars stand out as a specialized design that enhances fluid circulation and reduces the risk of differential sticking.
There are different kinds of drill collars,including round drill stop collar,spiral drill collar,non-magnetic drill collar,square drill collar and so on.
Ordinary drill collar is the circular cross section, the center has a water hole. The wall thickness is larger,the nozzle is smaller. The weight of per unit length is greater than the size of drill pipe almost 4- 5 times .The majority of drill collar is thread processing directly on the pipe body. But some of them also use the replaced joint.
Elevator groove and slip groove made on box thread face. Of slick drill collar or spiral drill collar can be used as lifting sub. And safety slip when tripping out. The technical parameters for elevator groove and slip groove are as API Spec7-1. Hardbanding is optional at customers’ requests.
Key Functions of Drill Collars:
Weight on Bit (WOB): Transfers weight to the drill bit, allowing efficient rock penetration.
Stiffness: Stabilizes the drill string and maintains borehole direction.
Vibration Control: Reduces drill string oscillation, minimizing tool wear.
BHA Performance: Works in combination with stabilizers, subs, and reamers to optimize drilling efficiency.
Selection Inputs
- Hole size, tool OD, connection (NC/IF/REG)
- Directional plan and target WOB/RPM
Drill collar manufacturer sizes and weights:
| Design | O | D | ID | Length | Chamfer Diameter |
|---|---|---|---|---|---|
| in | mm | +1.6-0.0mm | +152.4mm | +0.4mm | |
| NC23-31 | 3 1/8 | 79.4 | 31.8 | 9.15 | 76.2 |
| NC26-35 | 3 1/2 | 88.9 | 38.1 | 9.15 | 82.9 |
| NC31-41 | 4 1/8 | 104.8 | 50.8 | 9.159.45 | 100.4 |
| NC35-47 | 4 3/4 | 120.7 | 50.8 | 9.159.45 | 114.7 |
| NC38-50 | 5 | 127.0 | 57.2 | 9.159.45 | 121.0 |
| NC44–60 | 6 | 152.4 | 57.2 | 9.159.45 | 144.5 |
| NC44–60 | 6 | 152.4 | 71.4 | 9.159.45 | 144.5 |
| NC44-62 | 6 1/4 | 158.8 | 57.2 | 9.159.45 | 149.2 |
| NC44-62 | 6 1/4 | 158.5 | 71.4 | 9.159.45 | 150.0 |
| NC46-65 | 6 1/2 | 165.1 | 57.2 | 9.159.45 | 154.8 |
| NC46-65 | 6 1/2 | 165.1 | 71.4 | 9.159.45 | 154.8 |
| NC46-67 | 6 3/4 | 171.5 | 57.2 | 9.159.45 | 159.5 |
| NC50-70 | 7 | 177.8 | 57.2 | 9.159.4 | 164.7 |
| NC50-70 | 7 | 177.8 | 71.4 | 9.159.45 | 164.7 |
| NC50-72 | 7 1/4 | 184.2 | 71.4 | 9.159.45 | 169.5 |
| NC56-77 | 7 3/4 | 196.9 | 71.4 | 9.159.45 | 185.3 |
| NC56-80 | 8 | 203.2 | 71.4 | 9.159.45 | 190.1 |
| 6 5.8REG | 8 1/4 | 209.6 | 71.4 | 9.159.45 | 195.7 |
| NC61-90 | 9 | 228.6 | 71.4 | 9.159.45 | 212.7 |
| 7 5/8REG | 9 1/2 | 241.3 | 76.2 | 9.159.45 | 223.8 |
| NC70-97 | 9 3/4 | 247.7 | 76.2 | 9.159.45 | 232.6 |
| NC70-100 | 10 | 254.0 | 76.2 | 9.159.45 | 237.3 |
| 8 5/8REGc | 11 | 279.4 | 76.2 | 9.159.45 | 266.7 |
China’s high-quality Drill collar supplier
How to Select the Appropriate Drill Collar？
When selecting drill collars, drilling companies and procurement managers should consider:
Material: Standard alloy steel vs. non-magnetic material.
Design: Plain vs. spiral, depending on well trajectory.
Thread Connections: API standard threads (NC38, NC50, 6-5/8 REG, etc.).
Length & OD Range: Typically 3 1/8″ to 11″ OD, with lengths up to 31 ft.
Surface Finish: Cold-worked threads and stress-relieved machining for durability.
Competitive Advantages of RIGRS Drill Collars supplier:
API Certified Manufacturing – Compliance with API Spec 7-1.
Custom Machining – Full range of thread types, spiral groove dimensions, and lengths.
Proven Reliability – Field-tested in Middle East, CIS, South America, and offshore projects.
Fast Delivery – Optimized supply chain ensures timely delivery for international projects.
OEM & Branding Options – Available for drilling contractors, rental companies, and resellers.
The applicable environments for RIGRS drill collars
Vertical Wells: Standard drill collars provide stability and WOB.
Directional and Horizontal Wells: Spiral drill collars improve circulation and reduce sticking.
Offshore Drilling: Non-magnetic collars prevent tool interference in high-value projects.
Rental & Service Companies: Require robust collars with long life cycles for repeated use.
