Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 2: 110 - 116

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.02.014

Reservoir Engineering

Development and performance evaluation of CO2-responsive preformed particle gel

  • DENG Jia′nan ,
  • ZHENG Hao ,
  • GAO Yuanxian ,
  • BI Wenliang ,
  • ZHAO Honghao ,
  • HE Jiayuan ,
  • LU Guiwu ,
  • ZHANG Xiao
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  • 1. College of Science of China University of Petroleum (Beijing), Beijing 102249, China;
    2. Sinopec Petroleum Exploration and Production Research Institute, Beijing 102206, China

Received date: 2024-05-10

  Revised date: 2025-02-13

  Online published: 2025-06-16

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Abstract

In response to the issue of preformed particle gel (PPG) degradation and dehydration caused by the acidic environment formed during CO2 flooding,a CO2-responsive preformed particle gel (CR-PPG) with a triple crosslinked network was prepared using N,N-dimethylacrylamide (DMAA),vinylimidazole (VIZ),and N-vinylpyrrolidone (NVP) as the main raw materials,along with the organic crosslinking agent N,N′-methylenebisacrylamide (MBA) and the nano-crosslinking agent vinyl silica nanoparticles (VSNPs),through aqueous solution polymerization.System optimization,CO2 responsiveness testing,conductivity testing,rheological testing,and core displacement experiments were conducted.The study shows that the optimal ratio of the monomers DMAA,VIZ,and NVP was found to be 2∶2∶1.The CR-PPG exhibited excellent CO2 responsiveness and mechanical strength,demonstrating efficient plugging and profile control capabilities during CO2 flooding.The CO2 responsiveness mechanism of CR-PPG is attributed to the protonation effect of the tertiary amine groups in its structure under CO2 acidic conditions.This study provides an important basis for plugging and profile control operations during CO2 flooding.

Key words： CO2 flooding; non-homogeneous reservoir; triple crosslinking; preformed particle gel; nano-crosslinking agent

Cite this article

DENG Jia′nan , ZHENG Hao , GAO Yuanxian , BI Wenliang , ZHAO Honghao , HE Jiayuan , LU Guiwu , ZHANG Xiao . Development and performance evaluation of CO2-responsive preformed particle gel[J]. Special Oil & Gas Reservoirs, 2025 , 32(2) : 110 -116 . DOI: 10.3969/j.issn.1006-6535.2025.02.014

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