浮式结构设计讲课.pptxVIP

一. 深水浮式结构常见深水浮式结构 截面形状二. 常见深水浮式结构功能常见深水浮式结构运动特性2.4. Concept SelectionHow the wells are located and structured;How will the drilling and completion of the wells be performed;How will the well flow be delivered to the platform, processed and exported to market;Method of construction, transportation and installation.Development : Subsea (“wet tree”) or surface (“dry tree”) wellsZHANG Da-gang (张大刚). Application of Tension Leg Platform Combined with Other Systems in the Development of China Deepwater Oil Fields. China Ocean Engineering , Vol. 20 , No. 4 , pp. 517 - 528Buoyancy must equal weight plus vertical loads from moorings and risers,Space available must equal or exceed space required for the functions to be performed,Motions, station keeping and stability must meet either minimum criteria,Functional RequirementsTopsides Weight and DimensionsEnvironmental ConditionConfiguration ProportionsDesign CriteriaArrangementsHydrostatic Subdivision (Stability)HydrodynamicsStructural design and analysisMooring and Foundation DesignWeight ControlWeights are usually divided into two main categories: “fixed” and “variable”. Fixed weights are normally weights which are physically attached to a platform when it is installed. “Payload” refers to the functional weights which the substructure (the structure providing the buoyancy) must support. Weights associated with the substructure, e.g. ballast, are typically not considered “payload”.StabilityBuoyancyDynamic stability(A + B) 1.4(B + C)Stability in damaged conditionStability in damaged condition