The invention relates to an
underwater well repair
assembly. The
underwater well repair
assembly comprises a safety joint, a blowout control valve, a totally-closed shear blade
blowout preventer, a stress joint and a tie-back device which are sequentially connected from top to bottom, as well as a guiding
short circuit arranged in the stress joint, wherein the safety joint is used for being connected with a
drill pipe; and the tie-back device is used for being connected with an
underwater Christmas tree. According to the underwater well repair
assembly, well repair operation of a
deep water oil and gas field can be performed by adoption of an active-
service engineering ship, and a large-scale floating-type drilling platform or a special well repair ship for building is not required to be used, so that the operation cost can be greatly lowered, and the well repair efficiency is improved. As the safety joint is arranged, in case of such severe working conditions as
typhoon during operation, emergency disposal can be performed, temporary well abandoning can be quickly and reliably conducted, the
engineering ship or the drilling platform is withdrawn, and the safety risks during operation can be reduced. The underwater well repair assembly can be used for the
engineering ship or the drilling platform, and can be widely applied to well repair operation of the
deep water oil and gas field adopting an underwater production
system development mode.