chip hold-down pressure(The chip hold-down phenomenon occurs when the bit breaks a chip from the formation. This chip will resist removal and movement from below the bit due to the difference in the hydrostatic pressure of the mud and the formation pressure. In order to remove this chip, fluids must penetrate beneath the chip.
: Air drilling has proven successful at reducing the "chip hold-down pressure", thereby enabling maximum rate of penetration (ROP).netwasgroup.usXeg)
