Patent ID: 9458681
Filing Date: 2016-10-04
CPC Classification: E21B

Claim Text:
1. A drilling vessel with a drilling deck, said drilling vessel comprising a drilling vessel floor structure defining the drilling deck, a riser spider and gimbal assembly that is recessed in the drilling vessel floor structure, wherein the riser spider comprises a support frame and at least two support tables, the support tables each having a top surface, wherein the tables are each guided by the support frame to allow displacement along a line between an active position and a retracted position, which lines of movement intersect at a common centre point, wherein the tables are each provided with a recess, which recesses face the common centre point when the tables are in their active position such that the recesses together define a support opening, wherein the gimbal is arranged between the riser spider and the drilling vessel floor structure, and moveably supports the support frame of the riser spider and the at least two support tables guided by the support frame, wherein the riser spider and gimbal assembly is recessed in the drilling vessel floor structure such that the top surface of the tables is flush with the drilling deck and thus forms part of the drilling deck, the riser spider and gimbal assembly further comprising multiple exchangeable adapter segments for adapting the support opening to the size and shape of the tubular to be supported therein, wherein at least one adapter segment is carried in each recess of the support tables, such that, when the supporting tables are positioned in their active position, the exchangeable segments together form a bushing for supporting the tubular, and wherein the tables and the adapters segments supported thereby are coupled, such that when the tables move from their active position into their retracted position each segment moves with the respective table it is coupled with and the bushing is opened up for passing an object through the opening between the at least two support tables and the adapter segments they support.