石油酸含量对稠油流体性质影响实验
Experimental Study on Influence of Petroleum Acid Content on Heavy Oil Fluid Properties
李步林 1张胜飞 1王强 1苟燕 1沈德煌 1王红庄1
作者信息
- 1. 中国石油勘探开发研究院,北京 100083
- 折叠
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.
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 petrole-um acids were analyzed by high-energy mass spectrometry to study their influence on types,viscosity,and emulsifi-cation characteristics of heavy oil fluids.The influence of petroleum acid content on viscosity-temperature charac-teristics 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 differ-ent petroleum acid contents through experiments.The study shows that the acid value(in terms of KOH)of the ul-tra-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 sam-ple from the Newtonian to the non-Newtonian fluid decreases from 120℃to 100℃when the content of the petro-leum acid increases from 0 to 50%.The apparent viscosity first increases and then decreases when the water cut in-creases.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 emulsifica-tion and corrosion of heavy oil and improving the efficient development of heavy oil resources.
关键词
超稠油/石油酸/黏温关系/流变性/乳化/风城油田Key words
ultra-heavy oil/petroleum acid/viscosity-temperature relationship/rheology/emulsification/Fengcheng Oilfield引用本文复制引用
基金项目
中国石油科学研究与技术开发项目(2021DJ1402)
出版年
2024
国家科技期刊平台
NSTL
万方数据