烷基甜菜碱表面活性剂疏水基碳链长度对低渗岩心自发渗吸的影响

doi:10.3969/j.issn.1006-6535.2021.04.014

摘要/Abstract

摘要： 为研究烷基甜菜碱亲水基结构相同、疏水基碳链长度不同对渗吸机理的影响,通过开展自发渗吸、接触角和油水界面张力实验,分析在高温、高矿化度、低渗透条件下,烷基甜菜碱疏水基碳链长度对自发渗吸的影响规律。结果表明:随着疏水基碳数由12增至18,4种烷基甜菜碱渗吸采出程度分别为37.8%、39.4%、41.0%和42.1%;渗吸方式均为逆向渗吸,接触角随碳数增加而减小,有利于原油剥离岩心;界面张力随碳数增加而降低,有利于油滴变形流动,共同促进渗吸过程。实验结果满足归一化采出程度模型,对烷基甜菜碱作为渗吸剂在低渗透油田应用具有理论指导意义。

关键词: 烷基甜菜碱, 低渗油藏, 两性表面活性剂, 自发渗吸, 界面张力, 润湿性

Abstract: In view of the influence of different hydrophobic carbon chain lengths of alkyl betaines with the same hydrophilic group structure on the imbibition mechanism, the influence of the hydrophobic carbon chain length of alkyl betaine on spontaneous imbibition under the conditions of high temperature, high salinity and low permeability conditions was analyzed by experiments conducted on spontaneous imbibition, contact angle and oil-water interfacial tension. The results showed that with the increase of carbon number of the hydrophobic group from 12 to 18, the degree of imbibition and recovery of the four alkyl betaines were 37.8%, 39.4%, 41.0% and 42.1%, respectively; the reverse imbibition was adopted; the contact angle decreased with the increase of carbon number, favorable to crude oil stropped from the core, and the interfacial tension decreased with the increase of carbon number, conducive to the deformation and flow of oil droplets, both of which promoted the imbibition. The experimental results were in line with the normalized recovery percent model, with a theoretical guidance for the application of alkyl betaine as a imbibition agent in low-permeability oil fields.

Key words: alkyl betaine, low permeability reservoir, amphoteric surfactant, spontaneous imbibition, interfacial tension, wettability

中图分类号:

TE357

朱维耀, 赵成圆, 马启鹏, 李华, 宋智勇. 烷基甜菜碱表面活性剂疏水基碳链长度对低渗岩心自发渗吸的影响[J]. 特种油气藏, 2021, 28(4): 102-107.

Zhu Weiyao, Zhao Chengyuan, Ma Qipeng, Li Hua, Song Zhiyong. Effect of Hydrophobic Carbon Chain Length of Alkyl Betaine Surfactant on Spontaneous Imbibition of Low-permeability Core[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 102-107.

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