Optimization And Bearing Capacity Analysis Of Small Fpso Mooring Foundation

With the development of offshore oil and gas resources,the traditional offshore platform is difficult to meet the operational requirements of oil and gas resources development because of its large size and immovable.Therefore,the new FPSO can adapt to the marine environment,The research of mooring and positioning system of floating platform has become a hot spot of the research of the deep sea platform.In this paper,based on the analysis of the time-domain coupling analysis of the mooring point of the force and submarine geological characteristics,through the pile foundation and suction anchor foundation mooring two basic structure form comparison,to determine the optimal FPSO mooring foundation.In this paper,based on the analysis of the time-domain coupling analysis of the mooring point of the force and submarine geological characteristics,through the pile foundation and suction anchor foundation mooring two basic structure form comparison,to determine the optimal FPSO mooring foundation.Furthermore,the numerical analysis method is used to analyze the stress and deformation of the mooring foundation structure,and the influence factors of the bearing capacity of the mooring foundation are studied.The main research contents and achievements are as follows:(1)Comparing and analyzing two kinds of mooring foundations,such as suction anchor foundation and pile foundation,which are commonly used in FPSO,from the aspects of bearing capacity,construction technology and economic cost.Based on the multi-point mooring small-scale floating platform structure(FPSO)in Shengli Oilfield and the local geological environment conditions,the comparison projects and contents of two kinds of foundation are expounded.In terms of economic applicability,or foundation bearing stability,the suction anchor foundation is superior to the uplift pile foundation.The mooring foundation of the FPSO is selected as the foundation of the FPSO byselecting the foundation of the anchor structure.(2)Through the three-dimensional numerical analysis of the bearing capacity of the suction anchor foundation structure,the load-displacement curve of the suction anchor foundation under different working conditions can be divided into three stages:approximate linear elasticity,elastic-plastic deformation and asymptotic failure.When the loading point is at the top of the foundation and the horizontal loading(β = 0 °)or the loading angle is small,there is no obvious yield point for the anti-tamping load-displacement curve of the suction anchor foundation.(3)Through the comparison and analysis of the results of numerical simulation under different aspect ratios,different loading angles and different loading points,it can be concluded that with the increase of the aspect ratio,the foundation bearing capacity increases,The loading capacity is reduced and the failure mode is changed from shearing failure to pull-out failure.Based on the numerical calculation and analysis of different loading points,it can be concluded that when the loading point is located at the basement,The depth of 2/3 position,the base bearing force.