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2024-08-08
In drilling operations, as a key component connecting ground equipment and downhole drill bit, the rotating action of Kelly is extremely critical and complex. When the kelly begins to rotate, its overall motion state presents a distinct feature: its top, that is, the part directly opposite to the turntable surface, is always firmly maintained above the turntable surface, ensuring smooth contact with the turntable surface and unhindered rotation during rotation. The bottom of the kelly, on the other hand, cleverly crosses the surface of the rotary table and goes deep below the surface of the rotary table, which is closely connected with the lower drilling tool system and transmits strong torque and force.
In order to ensure that the kelly will not be loosened or unbuckled accidentally during the high-speed rotation, the designer specially adopts the left-hand screw thread (reverse thread) design at the connection part between the upper end of the kelly and the faucet. This special design of the screw thread, its rotation and regular right-handed (positive buckle) opposite, can effectively resist the tendency of loosening due to rotation, so as to ensure the stability and safety of the connection part.
On the other hand, all connecting threads from the lower end of the kelly to the drill bit follow the drilling industry standard right rotary buckle (positive buckle) design. When the kelly drives the whole drill string to rotate, the threads of these positive threads will gradually bite more closely with the rotation of the drill string, effectively preventing the loosening caused by vibration or torque change, and ensuring the continuity and stability of drilling.
In addition, considering the durability of the lower joint thread of the kelly (this part is easy to wear due to frequent disassembly), the engineers also installed a protective joint in this part. This kind of protective joint can not only effectively disperse and reduce the wear of drill pipe joints during rotation and load-bearing process, but also improve the service life of the entire drilling system to a certain extent and reduce maintenance costs. It is indispensable in drilling operations. Important parts.
To sum up, the design of Kelly fully reflects the precision and complexity of drilling engineering, and every detail has been carefully considered and repeatedly verified to ensure the safety and stability of drilling operations.
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