Which of the following is a method used to speed up hole cleaning with air rotary?

• A. Increase air pressure
• B. Decrease air pressure
• C. Increase weight on bit
• D. Rotate the drill string faster

Answer: (A)

Hole cleaning in air rotary hinges on how well the air can carry cuttings up and out of the borehole. Raising the air pressure increases the velocity and energy of the flushing air in the annulus, which enhances its ability to suspend and transport cuttings to the surface. With higher air velocity, cuttings are less likely to settle back into the hole, so cleaning happens faster and the hole stays clearer.

Lowering the air pressure would slow the air and reduce its carrying capacity, making cleaning less efficient. Pushing more weight on the bit mainly affects how quickly you penetrate the rock, not how effectively cuttings are flushed out. Turning the drill string faster doesn’t directly boost the air’s ability to lift and transport cuttings, which is why increasing air pressure is the best way to speed up hole cleaning.