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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Drill pipe is a crucial component in drilling operations, primarily responsible for transmitting rotational power and withstanding the pressure encountered during drilling. Depending on application scenarios, technical requirements, and structural design, drill pipes come in various types and specifications.
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Single-Layer Joint Drill Pipe
The single-layer joint drill pipe is one of the most commonly used types. Typically made from seamless steel pipe, it consists of a single pipe section with an attached joint that connects two pipes, allowing for length adjustments based on drilling depth. This type is well-suited for straightforward drilling tasks due to its simple structure, ease of maintenance, and low cost.
Its specifications are shown in the following table:
|
Drill pipe model |
Outer diameter (inch) |
Length (feet) |
|
NWJ |
2 3/8 |
10 |
|
HWJ |
3 1/2 |
10 |
|
PWJ |
4 1/2 |
15 |
Double-layer Joint Drill Pipe
The double-layer joint drill pipe is more widely used due to its enhanced performance. It consists of two interconnected drill pipes and multiple joints. Compared with single-joint drill pipes, this design offers superior strength and durability, making it well-suited for deep drilling applications where higher pressure and heavier loads must be sustained.
Its specifications are shown in the following table:
|
Drill pipe model |
Outer diameter (inch) |
Length (feet) |
|
NZ |
2 3/8 |
6-10 |
|
HZ |
3 1/2 |
6-10 |
|
PZ |
4 1/2 |
10-15 |
Box Drill Pipe
Box drill pipe is a specialized type of drill pipe designed for enhanced stability under heavy loads. Its robust structure makes it particularly suitable for deep well drilling and challenging environments. With excellent pressure resistance and wear resistance, it performs reliably under demanding operational conditions.
Its specifications are shown in the following table:
|
Drill pipe model |
Box length (inch) |
Segment length (foot) |
|
HH |
18 |
10 |
|
PH |
18 |
15 |
|
CH |
18 |
20 |
Internal Impact Drill Pipe
The internal impact drill pipe is an internally driven tool designed to efficiently transmit impact force between the drill bit and the pipe body. When drilling through hard rock or encountering obstructions, it utilizes the reaction force generated by the internal impact head to effectively fracture the formation, enhancing drilling efficiency in challenging conditions.
Its specifications are shown in the following table:
|
Drill pipe model |
Outer diameter (inch) |
Impact head length (inch) |
|
DHD 340A |
4 1/2 |
12 |
|
DHD 350R |
5 1/2 |
14 |
|
DHD 360 |
6 1/2 |
16 |
External Impact Drill Pipe
The external impact drill pipe is another commonly used tool for challenging drilling operations. Similar in function to the internal impact drill pipe, it is designed to handle hard formations and obstacles. However, its impact force is delivered through an external mechanism, making it ideal for breaking through tough rock layers or other difficult drilling environments.
Its specifications are shown in the following table:
|
Drill pipe model |
Outer diameter (inch) |
Impact head length (inch) |
|
SD 4 |
2 5/8 |
10 |
|
SD 5 |
3 1/8 |
12 |
|
SD 6 |
3 1/2 |
14 |
Double Round Drill Pipe
The double round drill pipe is designed for mud circulation in drilling operations. It typically works in conjunction with specialized pup joints and casing pipes. Its distinctive feature is the variation between the inner and outer diameters, which helps optimize mud flow, reduce friction during drilling, and improve overall drilling efficiency.
Its specifications are shown in the following table:
|
Drill pipe model |
Inner diameter (inch) |
Outer diameter (inch) |
|
NC 23 |
2 1/4 |
3 |
|
NC 26 |
2 3/8 |
3 1/2 |
|
NC 31 |
2 7/8 |
4 |
Summary
Different types and specifications of drill pipes are designed to meet specific project needs and application scenarios. The above overview outlines the main categories and characteristics of commonly used drill pipes. For more detailed technical information, please refer to product documentation or consult industry professionals. Choosing the appropriate drill pipe model can significantly enhance drilling efficiency and minimize operational risks.
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