Key technologies for general design of multipurpose liftboat with large operational air gap

As multipurpose self-elevating platforms evolve towards deeper waters, larger scales, and multifunctionality, the modularization and generalization of platform design have become key challenges. This paper focuses on drilling and well-servicing operations in the Bohai Bay, considering the geological and environmental conditions of the target operational area. Systematic demonstrations were conducted for the configuration of the drilling and workover system, the jacking system, and the dynamic positioning (DP) system. A comparative analysis was performed on aspects such as calm sea water resistance, Cantilever, the Drill Floor, and Leg structural forms and strength analysis. Empirical formula methods were applied to reasonably forecast foundation bearing capacity and penetration depth. Additionally, a dynamic positioning capability analysis was conducted for the target Liftboat using hydrodynamic calculation methods. The study concludes by identifying key technologies and processes for the overall design of the next-generation multipurpose Liftboat with large operational air gap.