FDPSO气体泄露扩散规律数值模拟研究

应用流体动力学理论,通过数值模拟得到了浮式钻井生产储卸油装置(FDPSO)泄露速度、泄露位置、环境风速等因素对气体扩散分布的影响。结果表明,定风速下,气体扩散速度水平方向较垂直方向大,平面内横向较纵向大;不同泄露位置下,气体的扩散分布则主要取决于FDPSO的设备布置情况;不同泄露速度或风速下,气体浓度有着先升高后稳定的变化趋势。同时依据模拟分析结果进行了FDPSO油气处理模块安全逃生路线设计。

Numerical study on FDPSO gas leakage and diffusion law

FDPSO has tremendous technological advantages for marginal field developments in deep water or as an early production system. The gas leakage of FDPSO was simulated by computational fluid dynamics software to ensure the safe operation for FDPSO oil and gas production. The impact of gas composition, leak rate, leak location and other factors to the distribution of gas diffusion was determined. And the calculation results demonstrated under constant wind speed, the diffusion rate of methane in horizontal direction was larger than in vertical direction, in transverse direction was larger than in longitudinal direction; under different gas compositions, gases tended to affect each other making methane gather near electric dehydrator in the upper space, while hydrogen sulfide gather near slug catcher in the lower space; under different leak rates, the methane concentration increased with the leakage velocity first and then tended to be stable; under different leak locations, the methane diffusion and distribution mainly depended on the layout of FDPSO; under different wind speeds, the methane concentration increased first, then decreased and final stayed stable. Based on the results of simulation analysis, safe escape routes of FDPSO oil and gas processing module were designed.