离子组成对中低分子量聚合物抗盐行为的影响

doi:10.11885/j.issn.1674-5086.2020.10.10.02

西南石油大学学报(自然科学版) ›› 2023, Vol. 45 ›› Issue (4): 174-184.DOI: 10.11885/j.issn.1674-5086.2020.10.10.02

• 石油机械与油田化学 • 上一篇

离子组成对中低分子量聚合物抗盐行为的影响

王丽莉^1,2, 梁严³, 李文宏^1,2, 袁国伟^1,2, 曹苗⁴

1. 中国石油长庆油田公司勘探开发研究院, 陕西西安 710018;
2. 低渗透油气田勘探开发国家工程实验室, 陕西西安 710018;
3. 西南石油大学化学化工学院, 四川成都 610500;
4. 四川光亚聚合物化工有限公司, 四川南充 637900

收稿日期:2020-10-10 出版日期:2023-08-10 发布日期:2023-07-18
通讯作者: 王丽莉,E-mail:wll_cq@petrochina.com.cn
作者简介:王丽莉,1976年生,女,汉族,陕西宝鸡人,高级工程师,主要从事提高采收率技术研究。E-mail:wll_cq@petrochina.com.cn;梁严,1988年生,男,汉族,云南大理人,工程师,博士,主要从事油田功能化学剂研制与提高采收率技术研究。E-mail:gyfzly@126.com;李文宏,1973年生,女,汉族,山东临沂人,高级工程师,硕士,主要从事提高采收率技术研究。E-mail:lwh_cq@petrochina.com.cn;袁国伟,1982年生,男,汉族,河南南乐人,工程师,主要从事提高采收率技术研究。E-mail:365894187@qq.com;曹苗,1990年生,男,汉族,江西抚州人,助理工程师,硕士,主要从事提高采收率技术研究。E-mail:gyfzcm@126.com
基金资助:
中国石油重大科技专项(2016E-05)

Effect of Ion Composition on the Salt-tolerance Behavior of Medium-low Molecular Weight Polymers

WANG Lili^1,2, LIANG Yan³, LI Wenhong^1,2, YUAN Guowei^1,2, CAO Miao⁴

1. Exploration and Development Research Institute, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China;
2. National Engineering Laboratory of Low Permeability Oil and Gas Exploration and Development, Xi'an, Shaanxi 710018, China;
3. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
4. Sichuan Guangya Polymer Chemical Co. Ltd., Nanchong, Sichuan 637900, China

Received:2020-10-10 Online:2023-08-10 Published:2023-07-18

摘要/Abstract

摘要： 针对长庆侏罗系低渗透高矿化度油藏在化学驱中需要优选与油藏匹配性良好且抗盐性好的中低分子量聚合物的现实问题，较为系统地分析了离子浓度和类型对3种不同中低分子量抗盐聚合物抗盐行为的影响规律。通过黏度、松弛时间、荧光与环境扫描电镜等测试表明，与常规抗盐聚合物SAV55和分子量较低的缔合聚合物EY-131相比，分子量和缔合单体含量较高的缔合聚合物BHXF-850有更好的增黏性，但随着Na⁺、Ca²⁺和Mg²⁺的加入，BHXF-850的黏度保留率、松弛时间、溶液结构数目却是最小的且结构强度也最弱，对溶液微观结构的影响更为显著。同时，一价和二价离子对聚合物的抗盐行为并未产生差异化影响。相关认识可为油藏现场化学驱用中低分子量抗盐聚合物的优选提供参考与借鉴。

关键词: 侏罗系油藏, 离子组成, 中低分子量, 抗盐聚合物, 松弛时间, 溶液结构, 微观结构

Abstract: In view of the practical problem of choosing the medium-low molecular weight salt-tolerance polymer for Changqing Jurassic reservoir with low permeability and high salinity, this paper systematically analyzed the influence of ion concentration and composition on the salt-tolerance behavior of three different medium-low molecular weight salt-tolerance polymers. The measurement results of viscosity, relaxation time, fluorescence and environmental scanning electron microscopy showed that, compared with the conventional salt-tolerance polymer SAV55 and the associative polymer EY-131 with lower molecular weight, the associative polymer BHXF-850 with higher molecular weight and associative monomer content had better viscosifying capacity. However, with the addition of Na⁺, Ca²⁺ and Mg²⁺, the viscosity retention rate, relaxation time and solution structure number of BHXF-850 were the lowest and the structural strength was also the weakest, and the solution microstructure was significantly affected by the addition of ions. At the same time, the salt-tolerance behavior of the polymer had no obvious difference between the addition of mono-valent and divalent ions. The findings can provide reference for the optimization of medium-low molecular weight salt-resistant polymers used for chemical flooding in reservoir fields.

Key words: Jurassic reservoir, ion composition, medium-low molecular weight, salt-tolerance polymers, relaxation time, solution structure, micro-structure

中图分类号:

王丽莉, 梁严, 李文宏, 袁国伟, 曹苗. 离子组成对中低分子量聚合物抗盐行为的影响[J]. 西南石油大学学报(自然科学版), 2023, 45(4): 174-184.

WANG Lili, LIANG Yan, LI Wenhong, YUAN Guowei, CAO Miao. Effect of Ion Composition on the Salt-tolerance Behavior of Medium-low Molecular Weight Polymers[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(4): 174-184.

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离子组成对中低分子量聚合物抗盐行为的影响

Effect of Ion Composition on the Salt-tolerance Behavior of Medium-low Molecular Weight Polymers

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