Self-elevating Drilling Unit Superstructure Strength Analysis

Since the21st century,the economic is developing rapidly.there is a sharp increase in energy demand,however,the reserves of oil and gas is just little leftthis results in the demand for offshore oil and gas exploration is increasing. Jack-up offshore platform as one of the important engineering equipments plays an irreplaceable role in the offshore oil and gas resources exploration.In this paper,base on a jack-up drilling rigs in the background,and considered the the characteristics of the jack-up superstructure.Do theoretical research on the superstructure,and by using SESAM software developed by DNV to model and determine the boundaries conditions to complete the analysis of the various conditions and check the strength of the superstructure.First,this paper overviews the jack-up drilling rig, describes the working principle and structure composition. And then studied the jack-up platform four main design conditions and different loads under various working conditions in the environment.For the environmental load,we force on the wind load, Clear all the forces of the platform load conditions,which compultes Clear all the forces of the load platform conditions, which computes numerical basis for the superstructure strength analysis.Finally, after calculation and analysis by ABS rules,the yield strength and buckling strength are both to meet requirements.the design of the superstructure is safe and reliable.