Reviewed is theoretical background of mechanical drilling with low pressure recovery, pressure equilibrium and differential pressure. Given are the results of implementation of pressure drop method at the bottomhole while washing the well by ejecting. It is mentioned that in comparison with earlier proposed drill bits with ejecting nozzles, ejecting subs can be used in drilling equipment with any kind of drill bits and within the estimated interval in which its installation is most reasonable considering location of productive formation, caving and lost circulation zones.