深海采矿跳井输送浆体的数值模拟

Marcio Yamamoto, Tomo Fujiwara, J. Yamamoto, Sotaro Masanobu
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引用次数: 0

摘要

立管系统是深海采矿的关键技术之一。在石油工业中,立管已经是一项经过现场验证的技术。然而,石油生产立管与深海采矿立管之间存在一些差异,主要与内部流动有关。矿浆比碳氢化合物密度大,应以高得多的流量泵送。目前用于立管动态分析的软件工具可能包括内部流体静水压力和弯曲管内部流动施加的离心力和科里奥利力。但内部压降不计算。内压改变了管道的有效张力,改变了管道的弯矩,从而改变了管道的力学行为。本文描述了一个用于立管动态分析的计算脚本的开发,该脚本可以嵌入到商业软件中运行。我们的脚本计算随着跳线的内部粘性压降。然后将该压力转换为壁轴向张力(屈曲),并施加到跳线数值模型的每个节点上。每个模拟工况分别计算了有无内流粘滞压降的情况。与实验数据的比较表明,在各种情况下跳线的平均位置具有较好的一致性。然而,由顶部振荡引起的振幅存在一定的差异。在水平方向上,实验数据振幅最大,而不计算粘性压力的模拟数据振幅最小。嵌入脚本的模拟在水平方向上具有中间振幅。垂直方向振幅在所有情况下都有相同的行为,但实验数据显示振幅最高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation of a Jumper Conveying Slurry for Deep-Sea Mining
One key technology for Deep-Sea Mining is the riser system. The riser is already a field-proven technology in the Petroleum Industry. However, several differences exist between a petroleum production riser and a riser for Deep-Sea Mining, mainly related to the internal flow. The ore-slurry has a larger density than the hydrocarbons and shall be pumped with a much higher flowrate. The current software tools for riser’s dynamic analysis may include the internal fluid hydrostatic pressure and the centrifugal and Coriolis forces imposed by the bent pipe’s internal flow. However, the internal pressure drop is not calculated. The internal pressure alters the pipe’s effective tension and can alter the pipe’s bending moment changing its mechanical behavior. This article describes a computational script’s development to run embedded in a commercial software for riser’s dynamic analysis. Our script calculates the internal viscous pressure drop along with the jumper. This pressure is then converted into wall axial tension (buckling) and imposed on each node of the jumper’s numerical model. Each simulation case was calculated twice with and without the internal flow viscous pressure drop. The comparison with experimental data revealed that the jumper’s average position has a good agreement among all cases. However, the amplitude caused by the top oscillation showed some discrepancies. Experimental data has the highest amplitude in the horizontal direction, while the simulation without viscous pressure calculation had the smallest. The simulation with our embedded script had intermediary amplitude in the horizontal direction. The vertical direction amplitudes have the same behavior for all cases, but the experimental data showed the highest amplitude.
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