FIELD: mining industry.
SUBSTANCE: method includes providing for possibility of boring by outer filter column due to protection of filtering elements of the latter and removal of free connection between inner hollow of column to force-pumping water horizons, use of composite mechanical valve, one portion of which is a back conical surface of a chisel with a crow, for regulating amount of sand removed from the well.
EFFECT: regulated removal of sand with high hydrostatic pressures, shorter time of construction, greater depth and length of well, higher effectiveness, simplified construction, higher ecology effectiveness and safety of method, lower energy consumption, higher reliability, lower loads on working bodies, protection of filtering surfaces.
4 cl, 5 dwg
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