Rotary Drilling Unit I, Lesson 4: Rotary, Kelly, Swivel, Tongs, And Top Drive

Rotary drilling solves the problems of having to stop drilling to bail, and of cave-ins in soft formations. The beauty of the rotary method is that it not only rotates the bit to drill ahead , it also removes cuttings from the hole at the same time. Removing cuttings at the same time the bit drills keeps the hole clean, regardless of how soft the formations are.

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