Study On Lightweight Technology Of Deep Water Jacket Platform

With the deepening of my country's deep-sea energy development,the number of deep-water jacket platform construction is increasing.From the perspective of the entire life cycle of the deep-water jacket platform,the light-weight optimization design of the structure is carried out,that is,the deep-water jacket platform is optimized by shape,structure,topology and other optimization methods to reduce the redundant units and horizontal units of the jacket structure.Cross-sectional area,at the same time,through structural analysis to the safety and reliability of the optimization results.Due to the heavy weight of the deep-water jacket platform,by optimizing the structure,it can save the consumption of steel during the construction process,greatly reduce the construction cost,increase the economic benefit,make the structure more stable,safer and longer in service.This paper relies on a deep-water jacket platform in HY 14-1 oil and gas field,adopts ANSYS finite element analysis software topology optimization module,and proposes a stepwise iterative topology optimization method for deep-water jacket platform,based on structural analysis software SACS to verify the optimization results.Mainly conducted the following research:First,according to the actual engineering project data of the HY 14-1 oil and gas field and the actual working conditions in the specific sea area of the East China Sea,a finite element analysis model of a 4-leg 8 skirt pile structure was established.The working environment is located in a sea area of the East China Sea with a water depth of about 137.5m.The overall effect of wave load and flow load on the jacket platform.Secondly,according to the research objectives of the subject,using ANSYS finite element analysis software topology optimization module,a stepwise iterative topology optimization method for deep water jacket platform is proposed,and the activation process of jacket support structure is gradually can celled under optimization constraints,the optimization process will continue until the optimization goal or the maximum number of iterations is reached.After iterative topology calculation,the optimized jacket platform topology is obtained.In the process of light optimization of the deep-water jacket platform,it can be seen from the analysis and calculation that the use of K-type brace instead of X-type brace on the elevation of the jacket structure can effectively reduce the quality of the jacket platform;under the condition of meeting the strength,When optimizing the size of the deep water jacket platform,reducing the diameter of the main leg of the jacket is a more feasible and lightweight method;when optimizing,it can be combined with the force transmission path,by using the shortest force transmission route under the horizontal layer of the water truss,Eliminate redundant horizontal braces,thereby reducing overall platform weight.Finally,based on the structural analysis software SACS,on the premise of ensuring the same external constraints,the static and dynamic analysis and the response spectrum fatigue characteristics analysis of the model before and after the optimization of the jacket platform were carried out.In order to meet the requirements of strength,stability,fatigue and safety,the optimized design of the jacket platform uses less steel and is lighter.The optimized jacket weight is reduced by 8.2% and 18 nodes are reduced,which meets expectations Of lightweight technical indicators.This paper uses a stepwise iterative topology optimization method to complete the optimization goals in the actual project,that is,to reduce the amount of steel used,reduce the development cost of the oil field,and increase the profitability,which has certain practical reference significance in the field of offshore engineering platform optimization design.