内外流激励下深海水合物双层管柱非线性振动特性试验

Experiment on nonlinear vibration characteristics of double layer pipe columns in deep sea hydrate wells under internal and external flow excitation

摘要

为有效探究深海水合物开采管柱系统振动机制。采用相似原理,研发内外流激励下深海水合物全井双层管柱振动模拟试验系统。探究颗粒粒径、各相占比、三相流流速以及外流场流速对内部连续油管的振动响应特性和非线性行为的影响规律。结果表明:开采管柱的竖直段和水平段强振位置不同,竖直段多在中段靠下(位于距底部1 880 mm位置),水平段多在距弯管500 mm位置;开采管柱的竖直段呈现为斜直线、宽斜直线或近似宽斜直线的运动轨迹,水平段则多为混乱轨迹或“8”字形混乱轨迹;颗粒粒径和固相占比的增大,体现为颗粒运移困难与堆积,导致振动位移幅值和振动能量降低(位移均方根从280 mm降低到120 mm);气相占比增大会导致管内多相流发生流态变化,内部多相流扰动更加明显,开采管柱的振动位移呈现增大的趋势;三相流流速的增大进一步诱发开采管柱的振动,并且存在某一流速会与管柱系统形成共振(竖直段为1.75 m/s,水平段为2.00 m/s),导致振动位移幅值陡增。

Abstract

An experimental simulation platform for the vibration of double-layer mining riser in deep-sea hydrate wells under internal and external flow excitation was developed in this study based on the principle of similarity to effectively explore its vibration mechanism. The influences of solid particle size, phase ratio, three-phase flow velocity, and external flow velocity on the vibration response characteristics and nonlinear behavior of internal continuous tubing were investigated. It is found that, the strong vibration positions of the vertical and horizontal sections of the mining string are different. In the vertical section, it is mostly located below the middle section (e.g. 1 880 mm from the bottom), while in the horizontal section, it is mostly located 500 mm from the bend position. The vertical section of the mining riser can exhibit a motion trajectory of oblique straight line, wide oblique straight line, or approximately wide oblique straight line, while the horizontal section is mostly of a chaotic trajectory or an "8"-shaped chaotic trajectory. The decrease in particle mesh size and the increase in solid phase proportion can be reflected in the difficulty and accumulation of particle transport, leading to a decrease in vibration displacement amplitude and vibration energy (such as the root mean square displacement reduced from 280 mm to 120 mm). The increase of the proportion of gas phase can lead to changes in the flow state of multiphase flow inside the pipe, resulting in more obvious internal multiphase flow disturbances. The vibration displacement of the mining riser shows an increasing trend. The increase in three-phase flow velocity can further induce vibration of the mining string, and there is a certain flow velocity that will resonate with the string system (such as 1.75 m/s for vertical section and 2.00 m/s for horizontal section), resulting in a sudden increase in the amplitude of vibration displacement.

关键词

天然气水合物 / 气-液-固三相流 / 流致振动 / 振动特性 / 非线性行为

Key words

natural gas hydrates / gas-liquid-solid three-phase flow / flow induced vibration / vibration characteristics / nonlinear behavior

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基金资助

国家自然科学基金项目(52105125)

河北省青年科学基金项目(B类)(E2025202002)

河北省高等高校科学研究项目(JCZX2025001)

中国博士后自然科学基金项目(2024M750718)

河北省燕赵黄金台聚才计划骨干人才项目(博士后平台)(B2024005002)

四川省科技计划(2025YFHZ0285)

四川省科技计划(2026YFHZ0097)