US 11,702,812 B2
Controlling movement of a cantilever structure of an offshore platform
Theodorus Wilhelmus Maria Badenberg, Rotterdam (NL); and René De Bruijn, Ooltgensplaat (NL)
Assigned to GUSTOMSC B.V., Schiedam (NL)
Appl. No. 17/198,966
Filed by GustoMSC B.V., Schiedam (NL)
PCT Filed Sep. 12, 2019, PCT No. PCT/NL2019/050592
§ 371(c)(1), (2) Date Mar. 11, 2021,
PCT Pub. No. WO2020/055250, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 2021625 (NL), filed on Sep. 13, 2018.
Prior Publication US 2021/0388568 A1, Dec. 16, 2021
Int. Cl. E02B 17/00 (2006.01); E21B 15/02 (2006.01); E21B 41/00 (2006.01); G05B 15/02 (2006.01); E02B 17/02 (2006.01)
CPC E02B 17/0017 (2013.01) [E21B 15/02 (2013.01); E21B 41/00 (2013.01); G05B 15/02 (2013.01); E02B 17/021 (2013.01); E02B 2017/0056 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling movement of a cantilever structure of an offshore platform, the cantilever structure being elongate in a longitudinal (X) direction and coupled to a hull of the platform via supports and skidding guides, the supports and the skidding guides being arranged for guided skidding displacement of the supports along associated ones of the skidding guides, the method comprising:
reading current position data representing a current position of an item on or of the cantilever structure;
reading target position data representing a target position of said item;
reading position dependent support load data associating support loads to at least a plurality of positions of said item;
determining, from the current position data and the target position data, displacements required for displacing said item to said target position including longitudinal skidding displacement of first ones of the supports of the cantilever in said longitudinal (X) direction and transverse skidding displacement of second ones the supports of the cantilever of the cantilever in a horizontal direction transverse to said longitudinal direction;
determining from said position dependent support load data support loads during said determined longitudinal skidding displacement;
determining a low wear trajectory of said item from said current position to said target position in which, if and until a sum of support loads or a highest support load decreases during said longitudinal skidding displacement towards the target position, said longitudinal skidding displacement towards the target position precedes said transverse skidding displacement and, if a sum of support loads or a highest support load increases during said longitudinal skidding displacement towards the target position, said transverse skidding displacement towards the target position precedes said longitudinal skidding displacement; and
controlling movement of the cantilever structure to follow said low wear trajectory.