| 间歇流下二氧化碳水合物生成形态与堵塞机理 |
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| 引用本文： | 何骋远,周诗岽,张文文,张青宗,吕晓方,王树立,赵书华. 间歇流下二氧化碳水合物生成形态与堵塞机理[J]. 化工进展, 2020, 39(3): 842-850. DOI: 10.16085/j.issn.1000-6613.2019-0960 |
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| 作者姓名： | 何骋远 周诗岽 张文文 张青宗 吕晓方 王树立 赵书华 |
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| 作者单位： | 常州大学石油工程学院油气储运技术省重点实验室, 江苏 常州 213016 |
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| 基金项目： | 江苏省高等学校大学生实践创新训练计划;江苏省研究生科研创新计划;国家自然科学基金 |
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| 摘 要： | 为明确二氧化碳水合物在间歇流条件下的生成形态与堵塞机理，采用高压可视实验环路进行了气团流及段塞流体系下的二氧化碳水合物的生成实验，分析了气团流与段塞流下二氧化碳水合物生成及堵塞形态图像。结果表明：气团流下水合物主要生成位置为管道顶部，以持续增长的水合物层的形式逐步减小环路流通面积，最终导致堵塞；段塞流下水合物在液相及管道顶部均有大量生成，但受制于大流量的冲刷，顶部水合物层无法长期存在，破碎落入液相主体中，导致液相主体黏度上升，流动阻力增大，流速下降，进而为液相中絮状水合物的并聚成块提供条件，液相中水合物的不断聚集是段塞流下水合物堵管的主要原因。此外，段塞流下生成的中空水合物球体是一种特殊的水合物形态，这类水合物多形成于液塞区与液膜区交界处。由于其内包裹着气体，故而会浮于液相空间上部，也会受扰动而破碎成片状水合物，但都无法在顶部空间聚集紧实形成致密水合层。
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| 关 键 词： | 水合物形态 堵塞机理 二氧化碳水合物 气团流 段塞流 |
| 收稿时间： | 2019-06-14 |
Formation morphologies and plugging mechanisms of carbon dioxide hydrate under intermittent flow |
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| HE Chengyuan,ZHOU Shidong,ZHANG Wenwen,ZHANG Qingzong,Lü Xiaofang,WANG Shuli,ZHAO Shuhua. Formation morphologies and plugging mechanisms of carbon dioxide hydrate under intermittent flow[J]. Chemical Industry and Engineering Progress, 2020, 39(3): 842-850. DOI: 10.16085/j.issn.1000-6613.2019-0960 |
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| Authors: | HE Chengyuan ZHOU Shidong ZHANG Wenwen ZHANG Qingzong Lü Xiaofang WANG Shuli ZHAO Shuhua |
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| Affiliation: | Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology，School of Petroleum Engineering，Changzhou University，Changzhou 213016，Jiangsu，China |
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| Abstract: | In order to clarify the formation morphologies and plugging mechanisms of carbon dioxide hydrate for intermittent flow, a high-pressure visual hydrate loop was used to carry out the formation experiment of carbon dioxide hydrate, and the formation and plugging morphology images of carbon dioxide hydrate under air mass flow and slug flow were analyzed. The results show that the main formation position of the hydrate under the air mass flow is the top of the pipeline, and the effective flow area is gradually reduced in the form of a continuously increasing hydrate layer, which eventually leads to pipeline plugging. Under the slug flow, hydrates are formed in large quantities in both the liquid phase and the top of the pipeline, but due to the erosion of large flow rate, the top hydrate layer can not exist for a long time. It breaks down into the main body of the liquid phase, resulting in the increase of the viscosity of the main body of the liquid phase, the increase of the flow resistance and the decrease of the flow velocity, thus providing conditions for the coalescence and agglomeration of flocculent hydrates in the liquid phase. The continuous accumulation of hydrate in liquid phase is the main reason for the hydrate plugging under slug flow. In addition, the hollow hydrate sphere formed under slug flow is a special hydrate form, which is mostly formed at the interface of liquid slug zone and liquid film zone. Because it is enclosed with gas, it will float in the upper part of liquid phase, and will be disturbed and broken into flaky hydrates, but these hydrates can not eventually gather and compact in the top space to form a dense hydrate layer. |
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| Keywords: | hydrate morphology plugging mechanism carbon dioxide hydrate air mass flow slug flow |
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