石油酸含量对稠油流体性质影响实验

doi:10.3969/j.issn.1006-6535.2024.01.015

摘要/Abstract

摘要： 石油酸是稠油体系中的强极性组分,为研究石油酸对稠油流体类型、黏度及乳化特征的影响,以新疆风城油田SAGD井组超稠油油样为研究对象,采用高能质谱仪分析石油酸分子结构特征。通过实验研究石油酸含量对稠油黏温特性及剪切流变性的影响规律,分析含水率在不同石油酸含量条件下对稠油表观黏度的影响特征以及其相应的油水乳化特性。研究表明:超稠油样品酸值(以KOH计)为5.46 mg/g,样品中石油酸含量约为1.71%,以2~3环一元酸为主,碳数主要分布在15~35;稠油黏度随石油酸含量增加而降低;石油酸含量从0增至50%时,样品从牛顿流体转为非牛顿流体的拐点温度从120 ℃降至100 ℃;含水率升高时表观黏度先增加后降低,当石油酸含量从0增至50%时,反相点的含水率由30%~40%降至20%~30%,且不同含水率下的黏度均有大幅下降。该研究揭示了中国西部超稠油石油酸分子结构特征和石油酸含量对稠油流体性质的影响规律,可为降低稠油乳化、腐蚀程度,以及稠油资源高效开发提供借鉴。

关键词: 超稠油, 石油酸, 黏温关系, 流变性, 乳化, 风城油田

Abstract: Petroleum acids are strong polar components in the heavy oil system. Taking the ultra-heavy oil samples from SAGD well group of Fengcheng oilfield in Xinjiang as the research object, the molecular structures of petroleum acids were analyzed by high-energy mass spectrometry to study their influence on types, viscosity, and emulsification characteristics of heavy oil fluids. The influence of petroleum acid content on viscosity-temperature characteristics and shear rheology of heavy oil was investigated, and the influence of water cut on the apparent viscosity of heavy oil and its corresponding oil-water emulsification characteristics were analyzed under the conditions of different petroleum acid contents through experiments. The study shows that the acid value (in terms of KOH) of the ultra-heavy oil sample is 5.46 mg/g, the petroleum acid content of the sample is about 1.71%, which are dominated by 2-3 cyclic monoacids, and the carbon number is mainly distributed in the range of 15-35; the viscosity of the heavy oil decreases with the increase of the petroleum acid content; and the inflection point temperature of the sample from the Newtonian to the non-Newtonian fluid decreases from 120 ℃ to 100 ℃ when the content of the petroleum acid increases from 0 to 50%. The apparent viscosity first increases and then decreases when the water cut increases. The water cut at the antiphase point decreases from 30%-40% to 20%-30%, and the viscosity decreases dramatically at different water contents and when the petroleum acid content increases from 0 to 50%. This study reveals the influence of molecular structure characteristics and petroleum acid contents of petroleum acids in ultra-heavy oil on the fluid properties of heavy oil in western China, which provides a reference for reducing emulsification and corrosion of heavy oil and improving the efficient development of heavy oil resources.

Key words: ultra-heavy oil, petroleum acid, viscosity-temperature relationship, rheology, emulsification, Fengcheng Oilfield

中图分类号:

TE33

李步林, 张胜飞, 王强, 苟燕, 沈德煌, 王红庄. 石油酸含量对稠油流体性质影响实验[J]. 特种油气藏, 2024, 31(1): 116-122.

Li Bulin, Zhang Shengfei, Wang Qiang, Gou Yan, Shen Dehuang, Wang Hongzhuang. Experimental Study on Influence of Petroleum Acid Content on Heavy Oil Fluid Properties[J]. Special Oil & Gas Reservoirs, 2024, 31(1): 116-122.

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