Journal of Petrochemical Universities ›› 2026, Vol. 39 ›› Issue (3): 58-63.DOI: 10.12422/j.issn.1006-396X.2026.03.007

• Petroleum Engineering • Previous Articles     Next Articles

Exploration and Application of Weak Gel System for Channeling Control and Plugging in CO₂ Flooding

Tao XU()   

  1. Petroleum Engineering Technology Research Institute of China Petrochemical Jianghan Oilfield Company,Wuhan Hubei 430000,China
  • Received:2025-08-07 Revised:2025-11-24 Published:2026-06-25 Online:2026-06-10

CO2驱防窜封堵用弱凝胶体系探究及应用

徐涛()   

  1. 中国石油化工股份有限公司江汉油田分公司 石油工程技术研究院,湖北 武汉 430000
  • 作者简介:徐涛(1994—),男,博士,工程师,从事油气田开发储层改造、油田化学方面的研究;E-mail:xtswpu@163.com
  • 基金资助:
    国家自然科学基金项目(52404042);江汉油田分公司盐间页岩油有效动用项目(JKKBF0625002)

Abstract:

Conventional polymers fail to meet the requirements for channeling control and plugging under high temperature and high salinity conditions, creating an urgent demand for more durable materials.Two acrylamide-based preformed particle gels (PPGs): polyelectrolyte-based (DJZ-1) and polyzwitterionic-type (LXLZ-2) were synthesized for enhancing CO2 plugging efficiency. The swelling behavior of the gel was analyzed under different temperature, salinity and pH conditions using Ritger-Peppas and Yavari-Azizian models. The results indicate that the swelling degrees of DJZ-1 and LXLZ-2 in water are 56 and 18 respectively. With the rise of ionic strength, the swelling degree of DJZ-1 declines remarkably, whereas that of LXLZ-2 stays nearly constant. Changes in pH value only elevate the swelling degree of DJZ-1 and have no impact on LXLZ-2. LXLZ-1 can maintain long-term thermal stability under reservoir conditions at 120 ℃, and both systems can effectively exert the performance of PPG weak gel systems.

Key words: Channeling control and plugging, Gels, Polymers, Flooding, Temperature resistant, Salt resistant

摘要:

传统的聚合物在高温和高盐度条件下不能满足防窜封堵要求,迫切需要更具耐久性的材料。合成了两种基于丙烯酰胺的预成型颗粒凝胶(PPG)——聚电解质型水凝胶(DJZ-1)和聚两性离子型水凝胶(LXLZ-2),用于提高CO2封堵效率;利用Ritger-Peppas和Yavari-Azizian模型,分析了凝胶在不同温度、盐度和pH条件下的溶胀行为。结果表明,DJZ-1、LXLZ-2在水中的溶胀度分别为56、18;随着离子强度增加,DJZ-1的溶胀度显著下降,而LXLZ-2基本保持不变;pH变化仅使DJZ-1的溶胀度增加,对LXLZ-2无影响;LXLZ-2能在120 ℃的油藏条件下保持长期热稳定性,两个体系都能有效地发挥PPG弱凝胶体系。

关键词: 防窜封堵, 凝胶, 聚合物, 驱替, 耐温, 耐盐

CLC Number: 

Cite this article

Tao XU. Exploration and Application of Weak Gel System for Channeling Control and Plugging in CO₂ Flooding[J]. Journal of Petrochemical Universities, 2026, 39(3): 58-63.

徐涛. CO2驱防窜封堵用弱凝胶体系探究及应用[J]. 石油化工高等学校学报, 2026, 39(3): 58-63.