FIELD: oil and gas extractive industry.
SUBSTANCE: system has drilling column with longitudinal passage for drilling mud with output aperture at end portion, pump device for pumping drilling solution through passage. Ring space between drilling column and drilling well wall contains main mass of drilling mud. Means for adjusting pressure of drilling mud has pump with outlet. It is connected to main mass of drilling mud through outlet pipe. Drilling column includes lower and upper sections. Sections are interconnected by detachable means of connecting lock. Open upper end of lower section is placed in chamber for drilling mud. Upper section passes into chamber for drilling mud though its upper aperture. Chamber for drilling mud includes lower and upper portion. Upper portion is hermetically overlapped from lower one by removable compacting means.
EFFECT: higher reliability and safety.
13 cl, 2 dwg
