Synthesis and plugging performance of NIPAM-based thermo-salt dual-responsive microgels

Xie Kun; Mei Jie; Cheng Qian; Cao Weijia; Yang Erlong; Gao Mingxuan; Lu Xiangguo; Wang Xiaoyan

doi:10.7623/syxb202608006

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Synthesis and plugging performance of NIPAM-based thermo-salt dual-responsive microgels

更新时间：2026-09-14

- Synthesis and plugging performance of NIPAM-based thermo-salt dual-responsive microgels
- ACTA PETROLEI SINICA Vol. 47, Issue 8, Pages: 1603-1613(2026)
- 作者机构：
  
  1. 东北石油大学提高油气采收率教育部重点实验室,黑龙江,大庆,163318
  2. 中国石油大学(华东)非常规油气开发教育部重点实验室,山东,青岛,266580
  3. 中国石油大港油田公司采油工艺研究院,天津,300280
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202608006
  CLC： TE357
- Online First：08 September 2026，
  
  Published：2026
- 稿件说明：
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谢坤, 梅杰, 程前, 曹伟佳, 杨二龙, 高铭宣, 卢祥国, 王晓燕. NIPAM系温盐双响应微凝胶合成及封堵效果[J]. 石油学报, 2026, 47(8): 1603-1613.

Xie Kun, Mei Jie, Cheng Qian, et al. Synthesis and plugging performance of NIPAM-based thermo-salt dual-responsive microgels[J]. ACTA PETROLEI SINICA, 2026, 47(8): 1603-1613.
谢坤, 梅杰, 程前, 曹伟佳, 杨二龙, 高铭宣, 卢祥国, 王晓燕. NIPAM系温盐双响应微凝胶合成及封堵效果[J]. 石油学报, 2026, 47(8): 1603-1613. DOI： 10.7623/syxb202608006.

Xie Kun, Mei Jie, Cheng Qian, et al. Synthesis and plugging performance of NIPAM-based thermo-salt dual-responsive microgels[J]. ACTA PETROLEI SINICA, 2026, 47(8): 1603-1613. DOI： 10.7623/syxb202608006.

摘要

针对硅酸盐凝胶成胶反应速率快、容易造成井筒堵塞和储层伤害、难以实现高效液流转向的问题

提出利用NIPAM系共聚温敏微凝胶负载硅酸钠

结合壳聚糖包裹温敏微凝胶构建温盐双响应微凝胶。通过正交试验确定了温敏微凝胶载体的最佳合成条件:乳化剂选择Span-80/Tween-80复合体系;乳化剂用量为7.5%;油水比为4∶1;交联剂用量为0.5%;搅拌速度为400 r/min;SA单体含量为10% 。利用红外光谱(FITR)、核磁共振氢谱(

H NMR)、扫描电镜(SEM)等技术表征方法

证实了微凝胶特殊的多孔空腔结构可为硅酸钠的高效负载提供结构基础。相变行为研究结果表明

温敏微凝胶低温下具有良好水化溶胀性能

当温度高于相变温度(LCST)时温敏微凝胶可通过相变实现体积收缩

利用壳聚糖为包覆材料构建的温盐双响应微凝胶释放硅酸钠时间可延长至10 d

温盐双响应微凝胶体系在油藏温度下温盐响应形成的微凝胶/硅酸盐凝胶复合体系对岩心封堵率超过60%

具备深部液流转向应用前景。

Abstract

To address the challenges associated with the rapid gelation of silicate gels

which can readily cause wellbore blockage and formation damage and thus hinder efficient fluid diversion

this study proposes a temperature-salt dual-responsive microgel system. The approach involves loading sodium silicate onto NIPAM-based thermoresponsive copolymer microgels and subsequently encapsulating them with chitosan to construct the dual-responsive microgels. Through orthogonal experimental design

the optimal synthesis conditions for the thermoresponsive microgel carrier were d

etermined as follows:a Span-80/Tween-80 composite emulsifier system

emulsifier dosage of 7.5 wt %

oil-to-water ratio of 4∶1

crosslinker dosage of 0.5 %

stirring speed of 400 r/min

and SA monomer content of 10 % . Using the characterization techniques such as FTIR

H NMR

and SEM

it has been confirmed that the microgels possess a unique porous cavity architecture

which provides a structural foundation for efficient sodium silicate loading. Phase transition behavior analysis shows that the thermoresponsive microgels exhibit excellent hydration and swelling performance at low temperatures

while undergoing volume shrinkage above the lower critical solution temperature (LCST). The chitosan-coated dual-responsive microgels extend the sodium silicate release duration to 10 days. Under reservoir temperature conditions

the temperature-salt responsive microgel system forms a microgel/silicate composite gel

achieving a core plugging efficiency of over 60 %

demonstrating strong potential for deep fluid diversion applications.

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