DEVICE FOR DEEP-SEA DRILLING AND METHOD OF DEEP-SEA DRILLING Russian patent published in 2019 - IPC E21B7/12 B63B35/44 

FIELD: soil or rock drilling.

SUBSTANCE: group of inventions relates to deep-sea drilling and can be used in structural-mapping, prospecting and exploration drilling. At the preparatory stage, which involves lowering of the face mechanism, drilling under the conductor, its installation and cementing and installation of the riser and connection of its upper part to the vessel, and lower part to the conductor, drilling device with a drill string consisting of drill pipes with threaded connections is used. At the well deepening stage, a device is used, wherein the drill string is a GNT string. Prior to operation, device for each of stages is in its initial position. Before the beginning of the preparatory stage of the drilling, the device for this stage is moved along the frame and fixed in the working position. After preparatory stage drilling string is removed, device for preparatory stage of drilling is returned along frame into initial position and fixed. Well deepening device is placed and fixed on frame in working position above upper part of riser, device for deepening is attached to upper part of riser and deep is performed with the help of this device.

EFFECT: reduced mechanical effect on riser and walls of well, reduced requirements to compensators of vessel oscillations, increased time of its productive use, increased stability, reduced power consumption of installation and labor input.

9 cl, 3 dwg