Which statement describes rotating the casing into place using the drill rig?

• A. Driving the casing down with a hammer
• B. Rotating the casing into place using the drill rig
• C. Pushing the casing down using hydraulic power
• D. Threading the casing from the surface

Answer: (B)

Rotating the casing into place with the drill rig is the standard way to install casing during air rotary drilling. The rotary drive provides torque to make up the joints as the casing is lowered, ensuring the threads engage properly and the string seats firmly. This method also maintains alignment and helps seal the casing as it advances.

Driving with a hammer risks damaging the casing and borehole walls, and hydraulic pushing can misalign joints or fail to achieve a proper seal. Threading from the surface would involve handling and rotation, but using the drill rig to rotate is the explicit method described for installing the casing in this context.