DRILLING SYSTEM HAVING SLOT FOR UNDERWATER STORAGE OF BOP ASSEMBLY

摘要

A drilling system includes a derrick installed on a platform of a stationary floating structure. An activity forms a borehole in a sea-bed, and carries out installation of a casing pipe assembly and a BOP assembly in the formed borehole. A BOP trolley forms the BOP assembly together with the activity, and moves while supporting the formed BOP assembly thereon. A slot is formed on a work stand of a moon pool for underwater storage of the BOP assembly so as to extend parallel with the direction of movement of the BOP trolley, and suppresses shaking of risers when the BOP assembly positioned underwater is moved by the BOP trolley and the BOP assembly is moved to an underwater storage position.

主权项

1. A drilling system comprising:
a derrick (110) which is installed on a platform of a stationary structure or a floating structure; an activity (120) which is installed on the derrick (110), forms a borehole in a sea-bed, and carries out installation of a casing pipe assembly (220) and a blow out preventer (BOP) assembly (210) in the formed borehole; a BOP trolley (130) which is installed to be positioned on the lower part of the derrick (110), forms the BOP assembly (210) by assembling a plurality of risers (212) and BOPs (211), in cooperation with the activity (120), and moves while supporting the formed BOP assembly (210) thereon; and a slot (140) which is formed on a work stand (141) of a moon pool for underwater storage of the BOP assembly so as to extend parallel with the direction of movement of the BOP trolley (130), and suppresses shaking of the risers that are extended from the BOP assembly (210) when the BOP assembly (210) positioned underwater is moved by the BOP trolley (130) and the BOP assembly (210) is moved to an underwater storage position.