Prediction of the Motion Responses of a Truss Spar Platform In South China Sea By Applying the Hybrid Model Testing Technique

Lu, Haining (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University) | Xiao, Longfei (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University) | Li, Xin (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University) | Xie, Wenhui (China National Offshore Oil Corp. Research Center)

OnePetro 

ABSTRACT

Exploration and production of offshore oil and gas resources in China are recently accelerating to move into the deep water. As the 1st deepwater gas field in China, LW3-1 is expected to start production in 2013. The water depth is up to 1500m. The truss spar is considered as one of the promising floating platforms. This paper focuses on predicting the global motion performances of the Spar in 1-year and 10- year metocean storms. Both numerical simulation and model tests have been carried out. The model tests were carried out in the deepwater offshore basin at Shanghai Jiao Tong University. Due to the depth limitation of the wave basin, mooring system was truncated with the hybrid model testing technique. Numerical validation with the truncated mooring system e.g. numerical reconstruction was performed to verify the model test. Extrapolation was also carried out to predict the hydrodynamic performances of the Spar in full water depth. Some useful conclusions were obtained. From the perspective of hydrodynamics, it is feasible and practical to apply the truss spar in exploration of oil and gas resources in South China Sea. And it can satisfy the requirements of offshore oil and gas production.



INTRODUCTION

With exploration and production activities of offshore oil and gas resources in China recently accelerating to move into the deep water, more severe challenges have been brought to the safe operation and survival of the floating platforms exposed in the harsh environments in South China Sea. More strict requirements have been proposed to be satisfied compared with the shallow water, such as Bohai Bay, East China Sea etc. Among various new types of the floating production structures, truss spar is considered as one of the promising floating production platforms in deep water.