NEIEP Mechanics Practice Exam

The three types of drilling methods are typically classified as rotary, percussion, and percussion rotary. Each of these methods utilizes distinct techniques suitable for different drilling requirements.

Rotary drilling involves the use of a rotating drill bit that cuts through the material, making it effective for penetrating hard rock formations. This method is commonly used in oil and gas exploration as well as in mineral extraction due to its efficiency and ability to maintain the integrity of the hole.

Percussion drilling, on the other hand, relies on a hammering action to break apart the material being drilled. This method is particularly useful in loose or fragmented rock where traditional rotary methods may not be as effective. The percussive force helps to crush the material at the drill bit, allowing for faster penetration in certain geological conditions.

Percussion rotary combines elements of both rotary and percussion techniques. This method uses rotary motion to aid in breaking the material while also employing a percussion mechanism, making it well-suited for mixed ground conditions where the material varies in hardness.

The other choices do not accurately reflect recognized drilling methods. The terms mentioned in those options are not standard classifications and do not encompass the essence of drilling techniques used in various industries.