FIELD: drilling, particularly plural down-hole drives, for example, for combined percussion and rotary drilling.
SUBSTANCE: device comprises drive unit with connection rod assembly extending from drive unit inside well and connected with tool head by end facing well bottom surface and, correspondingly, base. Tool head includes a number of tools working at bottom surface or at well base. Each tool includes face-plate with radial cutters and means providing face-plate oscillation in working regime.
EFFECT: provision of perfect drilling speed in rock of different formations.
23 cl, 12 dwg
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