FIELD: well drilling, particularly methods or apparatus for flushing boreholes.
SUBSTANCE: drilling tool comprises drilling part for rock cutting and receiver to collect drill fines. Device having members, which provide flushing medium pumping, is also disclosed. Above device provides transforming of fluid medium from well filling zone into flow, which conveys drill fines to receiver. Drilling tool comprises tubular body provided with crown bit located from drilling tool bottom and with lid located from drilling tool top. The lid has at least one liquid medium passage means. The lid and the tubular body define inner cavity. Drill fines receiver is arranged on upper lid side. Liquid medium passage means has valve assembly, which permits fluid flow movement through the passage means to inner cavity and closes the passage means when fluid flow passes in reverse direction.
EFFECT: simplified drilling operation.
13 cl, 4 dwg
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