Mechanical analysis of deepwater drilling riser system based on multibody system dynamics
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ORIGINAL PAPER
Mechanical analysis of deepwater drilling riser system based on multibody system dynamics Xiu‑Quan Liu1,2 · He‑Xiang Sun2 · Meng‑Ru Yu2 · Na Qiu2 · Yan‑Wei Li2 · Fu‑Lai Liu2 · Guo‑Ming Chen1,2 Received: 21 March 2020 © The Author(s) 2020
Abstract A multibody system including a drilling riser system, tensioners and a floating platform is key equipment for offshore oil and gas drilling. Most of the previous studies only focus on the drilling riser system rather than the multibody system. Mechanical characteristics of the deepwater drilling riser system cannot be analyzed accurately in a simplified model. Therefore, a three-dimensional multibody analysis program is developed. The static and dynamic characteristics of the deepwater drilling riser system under different platform motions are analyzed based on the developed program. The results show that the static displacement of the riser system with tensioners is smaller than that without tensioners, which means the tensioners can suppress the deformation of the riser system. Under surge and sway motions of the platform, the dynamic displacement of the riser system with tensioners is also smaller than that without tensioners due to the tensioner suppression effect. Besides, the heave motion induces a uniform axial vibration of the riser system, while roll and pitch motions excite the riser system to vibrate laterally. Compared with the stress amplitude due to surge and sway motions, the stress amplitude of the riser system due to heave, roll and pitch motions is relatively small but cannot be neglected. Keywords Deepwater · Riser · Tensioner · Drilling platform · Multibody dynamics List of symbols A Cross-sectional area of riser, m2 Ap Sectional area of piston, m2 Ar Sectional area of piston rod, m2 A0 Amplitude of regular wave, m cL Lateral damping coefficient, N/(m/s) ca Axial damping coefficient, N/(m/s) CM Inertia coefficient (dimensionless) CD Drag coefficient (dimensionless) Dh Hydrodynamic diameter of the riser system, m E Elastic modulus of riser material, Pa FL Lateral marine environmental load on the riser system, N Fa Axial hydrodynamic load, N T Axial tension of the riser system, N Edited by Xiu-Qiu Peng * Xiu‑Quan Liu [email protected] 1
National Engineering Laboratory of Offshore Geophysical and Exploration Equipment, China University of Petroleum, Qingdao 266580, China
Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao 266580, China
2
W Weight of per unit length of the riser system in seawater, N I Area moment of inertia of riser cross-section, m4 J Moment of inertia of riser unit, kg m2 Ph0 Initial pressure of high-pressure gas, Pa PL0 Initial pressure of low-pressure gas, Pa Ph High-pressure gas pressure, Pa PL Low-pressure gas pressure, Pa Vh0 Initial volume of high-pressure gas, m3 VL0 Initial volume of low-pressure gas, m3 Vh Current volume in the high-pressure gas vessels, m3 VL Current volume in the low-pressure gas vessels, m3 M Mass of piston ro
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