Scholarlink

<p>To address the limitations of conventional CO₂-responsive plugging materials (fixed network structure, slow response, and poor long-term stability) in fractured reservoirs, a novel terpolymer hydrogel poly(acrylamide-co-2-acrylamido-2-methylpropane sulfonic-co-acid-methylenebis(acrylamide)) hydrogel, denoted as P(AM-AMPS-MDA) was designed <i>via</i> solution copolymerization. The hydrogel features a hybrid network of covalent crosslinks (from MDA with tunable ethyleneamino chain length <i>n</i> = 1–3) and CO₂-induced ionic clusters, with precise reactant ratios (AM: AMPS: MDA = 90:16:4, K₂S₂O₈:Na₂SO₃=2:1) ensuring reproducibility. Comprehensive characterizations (FTIR, TGA/DSC, rheology, strain sweep) confirmed its superior performance: the optimized MDA₂ hydrogel (<i>n</i> = 2) exhibits rapid CO₂ response (&lt; 10&#xa0;min), balanced swelling ratio (~ 18), high storage modulus (1790&#xa0;Pa), and excellent thixotropy (&gt; 90% recovery in 30&#xa0;s). It maintains structural integrity at 80&#xa0;°C (<i>T</i><sub>d</sub> ≈ 617&#xa0;°C) and retains &gt; 85% mass over 10-year reservoir simulation. Core flooding tests and visual demonstrations validate its effective plugging (residual resistance coefficient &gt; 20) and injectability. This design resolves key trade-offs in existing systems, providing a promising candidate for conformance control in CO₂-enhanced oil recovery and sequestration.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

CO2-responsive terpolymer hydrogels with adjustable dynamic networks for fractured plugging in the reservoir

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月14日

查看全文
  • Yuanzi Yan,
  • Yan Tao,
  • Shaoli Zhou,
  • Yunfeng Fan,
  • Peng Zhang

摘要

To address the limitations of conventional CO₂-responsive plugging materials (fixed network structure, slow response, and poor long-term stability) in fractured reservoirs, a novel terpolymer hydrogel poly(acrylamide-co-2-acrylamido-2-methylpropane sulfonic-co-acid-methylenebis(acrylamide)) hydrogel, denoted as P(AM-AMPS-MDA) was designed via solution copolymerization. The hydrogel features a hybrid network of covalent crosslinks (from MDA with tunable ethyleneamino chain length n = 1–3) and CO₂-induced ionic clusters, with precise reactant ratios (AM: AMPS: MDA = 90:16:4, K₂S₂O₈:Na₂SO₃=2:1) ensuring reproducibility. Comprehensive characterizations (FTIR, TGA/DSC, rheology, strain sweep) confirmed its superior performance: the optimized MDA₂ hydrogel (n = 2) exhibits rapid CO₂ response (< 10 min), balanced swelling ratio (~ 18), high storage modulus (1790 Pa), and excellent thixotropy (> 90% recovery in 30 s). It maintains structural integrity at 80 °C (Td ≈ 617 °C) and retains > 85% mass over 10-year reservoir simulation. Core flooding tests and visual demonstrations validate its effective plugging (residual resistance coefficient > 20) and injectability. This design resolves key trade-offs in existing systems, providing a promising candidate for conformance control in CO₂-enhanced oil recovery and sequestration.