Abstract: An experimental setup was established to produce CO₂ hydrate slurry by cooling after CO₂ injection in precooled water. The flow characteristics of CO₂ hydrate slurry with 8.2%—23.1%(vol) in a 8 mm straight stainless steel circular tube were studied in a dynamic loop. The pressure drops of CO₂ hydrate slurry were measured and it increased with the increase of flow rate. The flow of CO₂ hydrate slurry presente non-Newtonian behavior. At flow rate v < 0.60 m·s^-1, behavior index n < 1 and decreased with the increase of solid fraction. CO₂ hydrate slurry behaved as a Herschel-Bulkley fluid. Apparent viscosity decreased with the increase of shear rate, showing shear-thinning characteristics. Apparent viscosity of CO₂ hydrate slurry was from 8.5 mPa·s to 10.6 mPa·s at shearing rate of 600 s^-1. The rheological parameters and equations were determined, providing the guide for the research of CO₂ hydrate slurry flow properties and its application.

Key words: carbon dioxide, hydrate slurry, flow, pressure drop, viscosity

摘要： 实验研究了固相分数为8.2%～23.1%的CO₂水合物浆在内径为8 mm的圆管中的流动特性。结果发现水合物浆在管内的流动压降随着流速的增加而增大。当流速低于0.60 m·s^-1时，浆体流变指数小于1，且随着固相体积分数的增大而减小，CO₂水合物浆为H-B流体，其表观黏度随着流速的增大而减小，呈剪切变稀特性。剪切速率为600 s^-1时，CO₂水合物浆的表观黏度为8.5～10.6 mPa·s。实验得到了CO₂水合物浆的流变特征参数及其流变方程，可为CO₂水合物浆的流动及其应用研究提供理论指导。

关键词: 二氧化碳, 水合物浆, 流动, 压降, 黏度