Question 3249 Deck General

70% to pass

The element that supports the weight of the drill stem, allows the drill stem to rotate, and provides a pressure-tight seal and passageway for the drilling mud to be pumped down the inside of the drill stem is called the _______________.

A bail
B cock
C kelly
D swivel
AI Explanation

The correct answer is D) swivel. The swivel is the key element of the drill string that supports the weight of the drill stem, allows the drill stem to rotate, and provides a pressure-tight seal and passageway for the drilling mud to be pumped down the inside of the drill stem. The swivel is designed to connect the top of the drill stem to the hook, enabling the drill stem to rotate while the mud is pumped through it. The other answer choices are incorrect because they do not serve the same comprehensive function as the swivel. The bail is used to lift the drill stem, the cock is a valve used to control the flow of fluids, and the kelly is the square or hexagonal section of pipe that connects the swivel to the drill stem.

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