China Kelly Bar Manufacturers Suppliers Factory - Customized Kelly Bar Made in China

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Production Equipment

We have the most advanced production equipment, including rolling machines, vertical lathes, and CNC automatic boring and milling machines.

Our Service

Our experienced and professional R&D team, 24/7 sales team, and dedicated operations and QC teams ensure we always provide the best solution for your project.

Production Market

Our products have been sold in more than 60 countries and regions, including the USA, Australia, Southeast Asia, Africa, and more.

Interlocking Kelly Bar

Interlocking Kelly Bar bars have a solid structure with continuous outer and inner sections that are connected throughout their entire length. They provide maximum stability and are suitable for various drilling methods, including rotary drilling and continuous flight auger (CFA) drilling.

Applications: Suitable for a wide range of drilling methods, including rotary drilling, CFA (continuous flight auger) drilling, and drilling in various soil types.

Versatility: Provides maximum stability and torque transmission, making it suitable for most drilling applications.

Interlocking Kelly Bar Index

Type	Drilling Depth	A	B	D	Weight
Type	(M)	(Mm)	(Mm)	(Mm)	(T)
3 Sections Interlocking Φ394-3×13m	33	13190	36200	14640	8.5
4 Sections Interlocking Φ394-4×15m	52	15190	55000	16640	11.5
5 Sections Friction Φ419-5×13m	58	13075	60800	14570	8.98
4 Sections Interlocking Φ419-4×13m	44	13190	46700	14640	9.15
5 Sections Friction Φ470-5×22m	100	22100	102800	23600	17.75
4 Sections Interlocking Φ470-4×18m	64	18190	66700	19640	15.53
6 Sections Friction Φ508-6×13m	68	13075	60800	14580	12.7
5 Sections Interlocking Φ508-5×15m	68	15075	70800	16580	13.84
4 Sections Interlocking Φ508-4×13m	44	13190	46700	14670	10.8
3 Sections Interlocking Φ508-3×15m	39	15190	42300	16640	13.44
6 Sections Friction Φ580-6×20m	110	20050	110000	21750	22.82
5 Sections Interlocking Φ580-5×18m	82	18050	81500	19750	21.83
4 Sections Interlocking Φ580-4×18m	64	18050	65500	19750	19.01
Other types can be manufactured as per customers' demand.

Features

2 – 5 fold telescopic construction for a depth range from 15 – 150 m
The tubular kelly sections are manufactured from high-tensile steel to ensure minimum weight at adequate strength
Torque transfer capacity 120 – 480 kNm
Interlocking type,friction type,full lock type.
Locks and wear-resistant drive rails (accordingly with rotary sleeve)
Robust Terminal joints, which are the terminal part of each telescopic pipe, are provided to transfer torque and crowd force to the kelly bar.
Standardized square kelly drive stub for connecting all types of drilling tools
Bottom shock absorbers
High-strength seamless steel pipe,35crmo,Q345B.

How do interlocking kelly bars work?

Interlocking Kelly bars are a crucial component in the world of drilling operations, designed to provide enhanced stability, efficiency, and safety. At the core of their functionality lies a unique interlocking system that allows multiple Kelly bars to be connected seamlessly, creating a longer and more robust drilling assembly.

The interlocking mechanism typically consists of a series of grooves, slots, or pins that interlock with corresponding features on the adjacent Kelly bar. This intricate design ensures a secure and stable connection, preventing the Kelly bars from becoming disconnected during the drilling process. The interlocking system distributes the drilling forces evenly across the entire length of the assembly, reducing the risk of bending, twisting, or other structural failures.

By interlocking multiple Kelly bars, the drilling rig can reach greater depths without compromising the integrity of the drilling system. This is particularly crucial in deep-well drilling operations, where the length of the drill string is a critical factor in achieving the desired depth. The interlocking mechanism also allows for easier and more efficient handling of the Kelly bars, as they can be quickly assembled and disassembled as needed.

Installation and maintenance of interlocking kelly bars

The proper installation and maintenance of interlocking Kelly bars are crucial for ensuring the longevity, safety, and optimal performance of your drilling operations. Adhering to the manufacturer’s guidelines and best practices is essential to get the most out of your interlocking Kelly bar system.

During the installation process, it is essential to carefully inspect each Kelly bar for any signs of damage or wear. Ensure that the interlocking mechanisms are free from debris and that the surfaces are clean and properly lubricated. Proper alignment and secure connections between the Kelly bars are critical to prevent any slippage or disconnection during the drilling process.

Maintenance of interlocking Kelly bars involves regular inspections, cleaning, and lubrication. Regularly check the interlocking mechanisms for any signs of wear, such as excessive play or damage to the grooves, slots, or pins. Cleaning the Kelly bars and applying the recommended lubricants can help minimize friction, reduce wear, and maintain the integrity of the interlocking system.

It is also essential to follow the manufacturer’s guidelines for the maximum allowable number of connections and the recommended replacement intervals for the interlocking Kelly bars. Exceeding these limits can compromise the structural integrity of the drilling assembly and increase the risk of failures.

Proper storage and handling of the interlocking Kelly bars are equally important. Ensure that the bars are stored in a clean, dry, and protected environment to prevent corrosion or damage. When transporting or handling the Kelly bars, take care to avoid dropping, bending, or subjecting them to excessive forces that could compromise the interlocking mechanism.

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