METHOD FOR EXPOSING OF WATER-BEARING BED Russian patent published in 1994 - IPC

FIELD: exposing of water-bearing beds in mineral deposit mining. SUBSTANCE: upward hole is drilled with use of filter assembly as components of drill pipe string. In course of drilling, filter is set in water-bearing bed, and flushing fluid is injected at pressure to ensure lifting of rock fine particles of water-bearing bed from well. Said lifting is regulated by injection capacity of flushing fluid and well drilling rate. Lifting of fine particle fraction is continued up to formation on bottom hole of natural filter from rock particles of water-bearing bed of medium-sized and coarse fractions. Then, casing string-borehole annulus is closed at wellhead. EFFECT: reduced time for putting well into operation due to producing natural filter of required parameters in course of drilling. 4 dwg