NGWA General Drilling Practice Exam 2025 – All-in-One Resource to Master Your Drilling Certification!

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How does rotary drilling differ from percussion drilling?

Rotary drilling uses a rotating bit; percussion uses a dropping tool

Rotary drilling is characterized by its use of a rotating bit that cuts through rock and soil through a continuous circular motion. This method effectively allows for the drilling of holes in various formations, including those that are harder and more consolidated. The rotation creates a cutting action that efficiently removes material from the borehole.

In contrast, percussion drilling involves a dropping tool or hammer that strikes the drill bit repeatedly to break up the material below. This method is more effective for softer formations, as the impact generated by the dropping action can displace material without the need for continuous rotation.

Understanding these fundamental differences in drilling techniques is essential for selecting the appropriate method to match the geological conditions and project requirements.

Get further explanation with Examzify DeepDiveBeta

Rotary drilling is faster; percussion is preferred for soft formations

Rotary drilling is used for shallow wells; percussion for deep ones

Rotary drilling uses water; percussion uses air pressure

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