甜菜碱型表面活性剂结构对CO2泡沫液膜性质的影响

doi:10.13809/j.cnki.cn32-1825/te.2023.03.006

油气藏评价与开发 ›› 2023, Vol. 13 ›› Issue (3): 313-321.doi: 10.13809/j.cnki.cn32-1825/te.2023.03.006

甜菜碱型表面活性剂结构对CO₂泡沫液膜性质的影响

王典林^1,²(),杨琼^1,²,魏兵^1,²(),戢炳鑫^1,²,辛军³,孙琳^1,²

1.西南石油大学油气藏地质及开发工程国家重点实验室，四川成都 610500
2.西南石油大学石油与天然气工程学院，四川成都 610500
3.中国石油川庆钻探工程公司地质勘探开发研究院，四川成都 610051

收稿日期:2022-07-28 出版日期:2023-06-26 发布日期:2023-06-26
通讯作者: 魏兵（1983年—），男，博士，教授，主要从事非常规油藏提高采收率方法和理论的研究。地址：四川省成都市新都区新都大道西南石油大学油气藏地质及开发工程国家重点实验室，邮政编码：610500。E-mail: bwei@swpu.edu.cn
作者简介:王典林（1987年—），男，博士，副研究员，主要从事非常规油气藏提高采收率方面的研究。地址：四川省成都市新都区新都大道西南石油大学油气藏地质及开发工程国家重点实验室，邮政编码：610500。E-mail：dianlin@swpu.edu.cn
基金资助:
国家自然科学基金“基于纤丝纳米材料（CNF）高稳泡沫驱体系的构筑及液膜夹断-分离行为研究”(51974265);国家自然科学基金“利用表面活性剂胶束合成多重环境粘附和自修复水凝胶及其伤口密封粘合应用研究”(22002124)

Effect of betaine surfactant structure on the properties of CO₂ foam film

WANG Dianlin^1,²(),YANG Qiong^1,²,WEI Bing^1,²(),JI Bingxin^1,²,XIN Jun³,SUN Lin^1,²

1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3. Research Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Limited Company, Chengdu, Sichuan 610051, China

Received:2022-07-28 Online:2023-06-26 Published:2023-06-26

摘要/Abstract

摘要：

在油藏泡沫驱和气藏泡沫排水剂应用中，泡沫体系的稳定性至关重要。表面活性剂分子结构，界面排布对泡沫液膜渗透率及稳定性的影响对于构筑高稳定CO₂泡沫具有重要意义，但是目前还没有一个系统的了解。采用4种分子结构的甜菜碱型表面活性剂作为研究对象，泡沫体相性质评价作为研究方法，针对饱和吸附量、泡沫液膜渗透率和泡沫稳定性等体相性质，开展了表面活性剂分子结构、界面排布、CO₂泡沫液膜渗透率和泡沫稳定性及其相关关系实验研究。研究表明：当表面活性剂分子头基一致时，疏水碳链长度增加，疏水作用增强，液膜表面分子排列更加紧密，泡沫液膜渗透率降低，泡沫稳定性增强；当表面活性剂分子具有更长疏水碳链时，增强的疏水作用导致液膜排布更加紧密且吸附量增大，阻碍气泡内CO₂气体渗透行为，导致起泡液起泡能力减弱。基于4种起泡体系所获参数进行回归分析，建立了泡沫寿命、泡沫液膜分子吸附量及起泡能力与泡沫液膜渗透率K的相关系数R²，拟合表明R² >0.90；因此，泡沫液膜渗透率K可作为评价泡沫体系的稳定性的参数之一，为高稳定泡沫体系筛选提供一个可靠的评价参数。

关键词: 表面活性剂, 分子结构, 泡沫液膜渗透性, 饱和吸附量, 泡沫稳定性

Abstract:

The stability of foam system is very important in the application of foam flooding and gas reservoir foam drainage agent. The influence of surfactant molecular structure and interface arrangement on the permeability and stability of foam liquid film is of great significance for the construction of highly stable CO₂ foam, but there is no systematic understanding at present. The betaine surfactant with four molecular structures is used as the research object, and the foam phase property evaluation is used as the research method. For the saturated adsorption capacity, foam liquid film permeability, foam stability and other phase properties, the surfactant molecular structure, interface arrangement, CO₂ foam liquid film permeability, foam stability and their correlation experiments are carried out. The results show that when the molecular head groups of surfactants are consistent, the hydrophobic carbon chain length increases, the hydrophobic effect increases, the molecules on the liquid film surface are arranged more closely, the permeability of foam liquid film decreases, and the stability of foam increases. When surfactant molecules have longer hydrophobic carbon chains, the enhanced hydrophobicity leads to a tighter arrangement of the liquid membrane and an increase in adsorption capacity, hindering the permeation behavior of CO₂ gas within the bubble and weakening the foaming ability of the foaming solution. Based on the regression analysis of the parameters obtained from four foaming systems, the correlation coefficient R² between foam life, foam liquid film molecular adsorption capacity and foaming capacity and foam liquid film permeability K is established. The fitting shows that R²>0.90. Therefore, the permeability of foam liquid film K can be used as one of the parameters to evaluate the stability of foam system and provide a reliable evaluation parameter for the screening of highly stable foam system.

Key words: surfactants, molecular structure, foam film permeability, saturated adsorption capacity, foam stability

中图分类号:

TE39

王典林, 杨琼, 魏兵, 戢炳鑫, 辛军, 孙琳. 甜菜碱型表面活性剂结构对CO₂泡沫液膜性质的影响[J]. 油气藏评价与开发, 2023, 13(3): 313-321.

WANG Dianlin, YANG Qiong, WEI Bing, JI Bingxin, XIN Jun, SUN Lin. Effect of betaine surfactant structure on the properties of CO₂ foam film[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(3): 313-321.

图/表 9

表1

甜菜碱型两性表面活性剂分子结构"

甜菜碱型表面活性剂	头基基团	碳链长度
$S O 3 - — 1$	$— S O 3 -$ ， $— N +$ ， $— O H$	12
$C O O - — 1$	$— C O O -$ ， $— N +$ ， $— C O N H$	11
$S O 3 - — 2$	$— S O 3 -$ ， $— N +$ ， $— O H$	16~18
$C O O - — 2$	$— C O O -$ ， $— N +$ ， $— C O N H$	17

表1

图1

表2

不同链长起泡剂吸附量实验所获参数"

体系	cmc/ %	Γ_cmc/ （mN/m）	$d γ d l o g c$	Γ_max/ （10^-10 mol/cm²）	A_min/ nm²
$S O 3 - —$ 1	8.0×10^-3	32.12	-5.97	1.05	158.15
COO^- $—$ 1	1.0×10^-4	24.58	-6.80	1.19	139.54
$S O 3 - —$ 2	8.0×10^-5	27.93	-7.71	1.35	123.01
COO^- $—$ 2	8.0×10^-5	23.20	-10.70	1.87	88.80

表2

图2

图3

图4

图5

图6

表3

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参数	相关系数（与液膜渗透率K）	存在联系
饱和吸附量	R²=0.91	吸附量越大，表明界面排布越密集，液膜渗透率越低，泡沫稳定性越好
起泡体积	R²=0.96	起泡液中表面活性剂分子碳链长度增加，起泡液的起泡能力增大，但与泡沫的渗透能力并未存在趋势关系
析液半衰期	R²=0.96	泡沫液膜渗透能力制约了泡沫的寿命与液膜稳定性，液膜渗透能力越差，泡沫寿命越久，表明泡沫越稳定
泡沫半衰期	R²=0.98	泡沫液膜渗透能力制约了泡沫的寿命与液膜稳定性，液膜渗透能力越差，泡沫寿命越久，表明泡沫越稳定

甜菜碱型表面活性剂结构对CO₂泡沫液膜性质的影响

Effect of betaine surfactant structure on the properties of CO₂ foam film

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