SET OF TOOLS FOR SUSPENSION OF PIPES OF DRILL STRING AT MOUTH OF UNDERWATER WELL Russian patent published in 2024 - IPC E21B33/43 

FIELD: mining.

SUBSTANCE: set of tools for suspension of pipes of a drill string in the mouth of an underwater well includes an adapter pipe, a housing, two-sided lower and upper subs, as well as a lowering element and an extraction element having a through channel. Adapter pipe, housing and lower sub are connected in series to each other, and the extraction element has a freely rotating axial position stabilizer with protrusions on the outer surface. Housing in lower part is made of stepped shape for installation on mating projection of block of valves of X-mas tree. Adapter pipe is made with a head part having a mounting surface for installation on the preventer unit, located in its lower part, and two coaxially located seats with differently directed threads for the lowering element and the extraction element. Each of lowering and extraction elements is made with possibility of connection with adapter pipe and upper sub, wherein lowering element and extraction element have oppositely directed threads for connection with appropriate seat of adapter pipe.

EFFECT: proposed solution makes it possible to provide disconnection of part of pipes of drill string from drilling rig with reduction of time for disconnection and return of pipes of drill string into operation, as well as reliable retention of part of pipes of drill string at wellhead.

6 cl, 8 dwg