Nonlinear quasi-static analysis of ultra-deep-water top-tension riser

2017 2nd International Seminar on Advances in Materials Science and Engineering

Gao, Guanghai^1 ; Qiu, Xingqi^1 ; Wang, Ke^1 ; Liu, Jianjun^1

College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong

266580, China^1

关键词: Drag force coefficients;    Floating systems;    Lateral displacements;    Outside diameter;    Quasi static analysis;    Simply supported beams;    Top tension risers;    Ultra deepwaters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012068/pdf
DOI  :  10.1088/1757-899X/231/1/012068

来源: IOP

【 摘 要 】

In order to analyse the ultra-deep-water top-tension riser deformation in drilling conditions, a nonlinear quasi-static analysis model and equation are established. The riser in this model is regarded as a simply supported beam located in the vertical plane and is subjected to non-uniform axial and lateral forces. The model and the equation are solved by the finite element method. The effects of riser outside diameter, top tension ratio, sea surface current velocity, drag force coefficient, floating system drift distance and water depth on the riser lateral displacement are discussed. Results show that the riser lateral displacement increase with the increase in the sea surface current velocity, drag force coefficient and water depth, whereas decrease with the increase in the riser outside diameter, top tension ratio. The top tension ratio has an important influence on the riser deformation and it should be set reasonably under different circumstances. The drift of the floating system has a complicated influence on the riser deformation and it should avoid a large drift distance in the proceedings of drilling and production.