FIELD: drilling oil and gas wells from ship. SUBSTANCE: proposed swivel unit includes through vertical trunk made inside ship, turret with vertical passage mounted inside said trunk and intermediate and inner pipes mounted in turret. When turret is secured relative to sea bottom, ship may turn relative to vertical axis depending on wind and sea currents. Intermediate pipe is connected with turret and inner pipe is connected with intermediate pipe and is provided with lower taper part for placing submersible buoy. EFFECT: enhanced efficiency. 5 cl, 3 dwg
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