文章摘要
降粘剂对稠油乳化反相点影响规律的研究
THE STUDY OF EFFECT OF VISCOSITY REDUCER ON EMULSIFICATION REVERSE PHASE POINT OF HEAVY OIL
投稿时间:2017-11-17  修订日期:2017-12-28
DOI:
中文关键词: 反相点,稠油,降粘剂,界面膜,沥青质
英文关键词: the reverse phase point  heavy oil  viscosity reducer  the interface membrane  asphaltene
基金项目:中石化胜利油田分公司科研项目“现河油区深层低渗敏感稠油储层开发技术研究”项目(YKC1501)资助。
作者单位E-mail
李美蓉 中国石油大学(华东)理学院 lmrong888@163.com 
于光松 中国石油大学(华东)理学院  
安波 中国石油大学(华东)  
孙秀婷 中国石油大学华东理学院  
李晨初 中国石油大学(华东)  
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中文摘要:
      稠油乳化反相点附近的稠油粘度较大,对于稠油开采及运输极为不利。本文通过考察温度、搅拌转速对稠油乳化反相点的影响,确定出稠油乳状液的制备条件,且发现随着温度的升高,稠油乳化反相点由40%(30℃)提前至35.6%(80℃);随着搅拌转速的增加,稠油乳化反相点呈现先增大后减小的趋势,且在转速为800r/min时稠油乳化反相点为48%。稠油开采过程中通过添加降粘剂来降粘,但降粘剂的添加也会对稠油乳化反相点产生一定的影响,随着降粘剂浓度的增大,水溶性降粘剂使其乳化反相点由48%提前至35.6%;而油溶性降粘剂浓度在0.3%之前,乳化反相点由48%提前至42%,油溶性降粘剂浓度在0.3%-0.7%时,乳化反相点由42%增加至47.4%。实验结果表明,降粘剂的加入确实使得稠油乳化反相点有所提前,且实验测定了降粘剂对稠油及其极性四组分的界面扩张模量和界面张力的影响,表明水溶性降粘剂是通过降低界面扩张模量及界面张力实现提前反相,而油溶性降粘剂仅通过降低界面扩张模量来实现反相;并且通过微观手段证明降粘剂主要是通过降低沥青质所组成的界面膜强度来实现反相。
英文摘要:
      Viscous heavy oil near the emulsification reverse phase point has a great viscosity, and it is extremely unfavorable for the exploitation and transportation of heavy oil. In this paper, the effects of temperature and stirring speed on the emulsification reverse phase point of heavy oil were investigated, the preparation conditions of heavy oil emulsion were determined.It was found that the emulsification reverse phase point was advanced from 40% (30℃) to 35.6% (80℃) with the increase of temperature. With the stirring speeding, The emulsification reverse phase point first increases and then decreases, and emulsification reverse phase point is 48% at the speed of 800r / min. In the process of heavy oil production, viscosity reducer is used to reduce viscosity, but the addition of viscosity reducer also has a certain impact on emulsification reverse phase point. As the viscosity reducer concentration increases, the water-soluble viscosity reducer advanced its emulsification phase point from 48% to 35.6%; while the oil-soluble viscosity reducer concentration was 0.3%, the emulsion phase point advanced from 48% to 42%. The oil-soluble viscosity reducer concentration was 0.3% -0.7%, the emulsification phase point increased from 42% to 47.4%. The experimental results show that the addition of viscosity reducer does make the emulsification reverse phase point advance earlier, and the influence of viscosity reducer on the interfacial dilatational modulus and interfacial tension of heavy oil and its four components were experimentally determined. It shows that the water-soluble viscosity reducer achieves early reversal by decreasing the interfacial dilatational modulus and interfacial tension. The oil-soluble viscosity reducer achieves phase reversal only by decreasing the interfacial dilatational modulus, and microscopic evidence shows that the viscosity reducer achieves reversal mainly by reducing the strength of the interfacial film composed of asphaltenes.
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