基于挂片法的原油凝点在线测量方法研究

摘要/Abstract

摘要： 凝点是衡量原油低温流动性的一项重要工程物性指标，但根据凝点测试国家标准，难以实现管道的在线测量。本研究通过流变仪开展了静态降温试验，结果表明，原油降温过程伴随的体积收缩和胶凝结构的形成导致转子在凝点附近开始受到显著的下拉轴向力。基于此，开发了一种基于拉力测试与标准凝点测试装置的挂片法凝点测定方法，有望实现原油凝点的准确在线测量。试验结果表明，挂片的桨叶数量和尺寸仅影响拉力的变化幅度，对凝点测试结果无显著影响。该方法重复性良好，适用于典型的石蜡基和中间基原油，并且测试结果与现行标准方法具有良好的一致性，可实现对管输原油凝点的远端测试，为输油管道运维的数字化、智能化转型提供了关键支撑。

关键词: 原油, 凝点, 挂片, 拉力, 在线测试

Abstract: Pour point is a critical engineering indicator for evaluating the low-temperature fluidity of crude oil, but according to the national standard test method for pour point, it is difficult to achieve online measurement in pipelines. In this study, static cooling experiments was conducted using a rheometer, revealing that volume contraction during cooling and gel structure formation induce a significant downward axial force on the rotor near the pour point. Based on this, a novel hanging plate method was developed, which is expected to enable accurate online measurement of crude oil pour points. Experimental results demonstrate that the number and size of paddle blades on the hanging plate only affect the magnitude of tension variation but have no significant impact on the pour point determination. The method exhibits excellent repeatability, applies to typical paraffinic and intermediate-base crude oils, and aligns well with existing standardized methods. It enables remote testing of pour points for pipeline-transported crude oils, providing crucial support for the digital and intelligent transformation of oil pipelines operation.

Key words: crude oil, pour point, hanging plate, tensile, online testing

石磊卞睿郁振华李传宪杨飞孙广宇姚博. 基于挂片法的原油凝点在线测量方法研究[J]. 石油炼制与化工, 2025, 56(11): 65-71.

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