Description:

The Kelly can be divided into square Kelly and hexagon kelly, which is produced and manufactured by the alloy constructional steel which is formed by forging or finish rolling using AISI 4142H-4145H. It will be carried out the heat treatment of quenching and tempering in the full length, and its Brinell hardness ranges from 285 to 341.The manufactory process of Kelly is operated according to the technical specifications of API. . The Drill Collar belongs to the drill stem of the drilling, which is the pipe to connect the drill head and the drill rod in the drilling operation. The square structure cooperates with the square structure of the turntable rumble in the rig. The rotating of the turntable rumble will drive the Kelly rotating, which plays a role in transmitting the momentum. The hollow structure is used for delivering the drilling fluid. The model is shortened by practical tools, and it can show its structure, thread shape and connecting form.

Details: