Question 3294 Deck General

The correct answer is D) kelly bushing. A kelly bushing is a special device that is fitted into the rotary table on a drilling rig. It transmits the rotational torque from the rotary table to the kelly, while simultaneously allowing the kelly to move vertically up and down to deepen the hole. This design allows the drilling operation to continue without interruption as the kelly is raised and lowered during the drilling process. The other answer choices are incorrect because they do not accurately describe the function of the device that connects the rotary table to the kelly and permits both rotational and vertical movement. A rotary bushing, master bushing, and kelly slips serve different purposes in the drilling rig assembly.