FIELD: mining.
SUBSTANCE: method involves reduction of supplied drilling fluid by means of a pump interconnected with a drill string in a well, outflow of fluid medium from the well to the first auxiliary pipeline connected to a water separating string, covering of a seal around the drill string, downward pumping of fluid medium via the second auxiliary pipeline with velocity chosen to maintain certain pressure in the well and stoppage of drilling fluid flow through the drill string.
EFFECT: improving reliability and simplifying the technology.
4 cl, 8 dwg
