FIELD: drilling of soil or rock.
SUBSTANCE: invention is intended for the directional drilling with the shank simultaneous feeding with possibility of fastening by snaps for the multiple round-trip operations. As the wellbore is drilled, installing each casing and shank having upper and lower internal snap connections. Installed under the original casing shank comprises external snapping device having dimensions suitable for the original casing internal snap connections connection. Drill string bottom assembly may comprise the inner column upper and lower outer snap devices for connection to the shank to be installed the upper and lower inner snap connections.
EFFECT: such arrangement allows to feed and install the shank by the drill string bottom assembly during the directional drilling and temporarily suspend the shank from the original casing to replace the drill string bottom assembly during drilling.
20 cl, 28 dwg
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