Threaded Drill Rod refers to a drill rod that is connected to other drill rods or drill bits through threaded joints at both ends. Threaded connections can be repeatedly disassembled and assembled, and have the characteristics of firm connection, reliable force transmission, and good sealing.
Specifications
|
Thread drill rod data |
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|
External Diameter |
Upset type |
Steel Pipe Grade |
Pipe Wall Thicknes |
Normal Weight |
Pipe length |
Thread model |
Joint Diameter |
|
|
inch |
mm |
mm |
Kg/m |
mm |
mm |
|||
|
1.6 |
42 |
EU |
DZ50 |
6.5 |
5.7 |
1000-9000 |
1:16 |
57 |
|
R780 |
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|
2 |
50 |
EU,IU |
DZ50 |
6.5 |
7.1 |
1000-9000 |
1:16 |
65 |
|
R780 |
68 |
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|
2.375 |
60 |
EU,IU |
R780 |
7.1 |
9.4 |
1000-9000 |
NC26 |
75 |
|
S135 |
78 |
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|
2.875 |
73 |
EU,IU |
R780 |
8 |
12.9 |
1000-9000 |
NC31 |
95 |
|
G105 |
9.19 |
14.5 |
106 |
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|
S135 |
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|
3.5 |
89 |
EU,IU |
R780 |
8 |
16 |
1000-9000 |
NC38 |
121 |
|
G105 |
9.5 |
19 |
127 |
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|
S135 |
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|
Lock joint/Drill pipe joint |
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|
External Diameter |
Inside Diameter |
Tool Joint Thread |
Matching Drill Pipe |
Joint Material |
|
|
mm |
mm |
Pitch |
Taper |
mm |
|
|
57 |
22 |
6 |
1:5 |
42 |
35CrMo |
|
65 |
28 |
6 |
1:5 |
50 |
35CrMo |
|
75 |
38 |
6 |
1:5 |
60 |
35CrMo |
|
86 |
44.5 |
4 |
1:6 |
60 |
35CrMo |
|
105 |
50.8 |
4 |
1:6 |
73 |
35CrMo |
|
121 |
68 |
4 |
1:6 |
89 |
35CrMo |
|
159 |
76.2 |
4 |
1:6 |
114 |
35CrMo |
|
159 |
76.2 |
4 |
1:6 |
127 |
35CrMo |
Threaded drill rod structure
1.Threaded drill rod body
Generally made of high-strength alloy steel pipe, with good tensile, torsion and bending resistance.
2.Threaded drill rod threaded joint (male joint/female joint)
The threaded part is the key to the connection of drill pipe, commonly:
Pin: convex threaded end
Box: concave threaded end
3.Threaded drill rod welding method or friction welding
The joint and the pipe body are usually welded by friction welding or precision welding technology to ensure the connection strength and coaxiality.
Advantages of threaded drill rod
1.Reliable connection
The threaded connection is precision machined, tightly joined, and has strong vibration resistance, making it suitable for operations in complex formations.
2.Easy to disassemble and reuse
Easy to assemble and disassemble, convenient for on-site transportation and replacement, long service life, and cost savings.
3.Strong torque transmission capacity
Can withstand large drilling torque and tension, suitable for deep hole drilling and hard rock drilling.
4.Excellent sealing performance
For drilling operations that require the delivery of flushing fluid or air, threaded connections can achieve good sealing and prevent leakage.
Common thread types
Depending on the industry and application, common thread types are:
| Thread model | Application area | Features |
|---|---|---|
| API REG(Regular) | Oil and gas drilling | High strength, high degree of standardization |
| API IF(Internal Flush) | Deep well drilling | Large diameter, reduced resistance |
| BECO thread | Water well and geological exploration | Good versatility, moderate cost |
| T-type thread(such asT38,T45,T51) | Top hammer drilling | Applicable to rock drilling rigs, open-pit drilling rigs |
| R-type thread(such as R32,R38,R51) | Small and medium diameter rock drilling operations | Small pitch, good fatigue resistance |
Employing thread drill rods is prevalent in the fields of geological exploration, water well drilling, and engineering of geothermal wells. thread drill rods is connected to the lock joint, transmits the drilling rig torque to the bottom hole drill bit, and is responsible for transmitting the drilling fluid. The rod body material is Shanghai Steel STM-R780 (42MnMo7), which is not easy to bend or break due to fatigue, and has stable and reliable performance. The thread drill rods end is heated by medium frequency, hydraulically upsetting and thickened, and buried tempered for 12 hours to ensure the density of the drill pipe and improve the mechanical properties. All core bit extension rod are processed by precision imported CNC lathes and customized forming knives for thread processing, which is precise and ensures the tightness of the connection with the lock joint.
Thread drill rods joints are made of 35 CrMo steel, are quenched and tempered after rough machining, and surface nitriding treatment after finishing, that makes the joints more wear-resistant and easy to disassemble without thread sticky, breaking and cracking. Precision imported CNC lathes and customized cutters are used for thread processing. All of core bit extension rods are adopted precision imported CNC lathes to do customized thread processing, it can not only ensure the standoff of the thread, but also ensure the precision and interchangeability of drill pipe joints.
We can produce API standard core bit extension rod of different materials, lengths, diametersand wall thicknesses. OEM service is also accepted.
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