Which method describes driving the casing down with a hammer or rig?

• A. Rotating the casing into place using the drill rig
• B. Pushing the casing down using the rig's hydraulic system
• C. Pulling the casing upward to straighten alignment
• D. Driving the casing down with a hammer or rig

Answer: (D)

Driving the casing down with a hammer or rig is the percussive installation method. It uses impact or ram force to push the casing through the borehole until it seats at the desired depth. This approach relies on direct, blunt force to overcome friction and minor obstructions, rather than twisting the casing in with rotation or pushing it with hydraulics. Rotation into place would use the rig’s rotation to thread or screw the casing, while hydraulic pushing applies steady pressure without the blows, and pulling upward is used for alignment or retrieval, not for driving the casing down.