Kelly tool

Halligan Tool Case

Kelly tool is a crucial component in the field of drilling engineering, particularly within the oil and gas industry. It is a drive system used in rotary drilling rigs to transmit rotational force to the drill string, enabling the cutting of rock layers and facilitating the drilling process. The Kelly tool's unique design and functionality make it an indispensable part of the drilling operation.

Overview

The Kelly tool is a long, square or hexagonal steel bar, known as the "Kelly bar," which is inserted into the swivel through the rotary table and connected to the top of the drill string. Its primary function is to transfer rotational motion from the rotary table to the drill string while allowing the drill string to be lengthened by adding additional sections of drill pipe. This process is essential for drilling wells to access petroleum and natural gas reserves.

Functionality

The Kelly tool works by fitting into a matching square or hexagonal opening in the rotary table. As the rotary table turns, it rotates the Kelly bar, which in turn rotates the entire drill string below it. The bottom of the drill string is equipped with a drill bit that cuts through the rock. The Kelly must also allow for vertical movement so that as the drill bit penetrates deeper into the ground, additional sections of pipe can be added to the drill string without interrupting the drilling process.

Types

There are two main types of Kelly bars:

• Square Kelly: The square Kelly is the more traditional form and is known for its good torsional strength, making it suitable for various drilling conditions.
• Hexagonal Kelly: The hexagonal Kelly offers a higher torsional strength than the square Kelly, which can be advantageous in more demanding drilling environments.

Safety and Maintenance

Safety is a paramount concern in drilling operations, and the Kelly tool is no exception. Regular inspections and maintenance are required to ensure that the Kelly bar and its connections are in good condition and can withstand the stresses of drilling. This includes checking for wear and tear, corrosion, and any potential cracks or defects that could lead to failure.

Environmental Considerations

While the Kelly tool itself does not directly impact the environment, the drilling operations it facilitates can have significant environmental implications. These include the potential for oil spills, groundwater contamination, and habitat disruption. As such, it is crucial for drilling operations to follow strict environmental guidelines and employ best practices to minimize their ecological footprint.

Conclusion

The Kelly tool is a fundamental component of the rotary drilling rig, playing a critical role in the oil and gas industry's ability to access underground resources. Its design and operation have been refined over the years to enhance efficiency and safety in drilling operations. Despite its importance, the industry continues to explore new technologies and methods to further improve drilling performance and reduce environmental impact.

Kelly tool Resources
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