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<p>Conventional plugging materials fail due to mismatched size and low strength, whereas gel-based agents offer better injectability and adaptability. However, their performance under high-temperature and high-pressure (HTHP) conditions is limited by poor thermal stability, low compressive strength and uncontrollable gelation time. To address these issues, a lignin-based gel (LBG) incorporating a dual-network polymer structure reinforced with sodium lignosulfonate (LS) was synthesized via one-pot thermal polymerization at 150&#xa0;°C and 20&#xa0;MPa. As a result, LBG exhibits a compressive strength of 8.24&#xa0;MPa with compressive strain exceeding 90% and the gelation time up to 156&#xa0;min. In wedge-shaped fracture of 5&#xa0;mm, the breakthrough pressure of the LBG reached 1.67&#xa0;MPa, demonstrating effective plugging in the fracture. These features make LBG a promising candidate for effective lost circulation control in HTHP reservoirs.</p>

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Dual-network lignin-based gel for high-temperature and high-pressure fracture plugging

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Zixuan Zhou,
  • Daqi Li,
  • Fan Li,
  • Jinhua Liu,
  • Yong Fu

摘要

Conventional plugging materials fail due to mismatched size and low strength, whereas gel-based agents offer better injectability and adaptability. However, their performance under high-temperature and high-pressure (HTHP) conditions is limited by poor thermal stability, low compressive strength and uncontrollable gelation time. To address these issues, a lignin-based gel (LBG) incorporating a dual-network polymer structure reinforced with sodium lignosulfonate (LS) was synthesized via one-pot thermal polymerization at 150 °C and 20 MPa. As a result, LBG exhibits a compressive strength of 8.24 MPa with compressive strain exceeding 90% and the gelation time up to 156 min. In wedge-shaped fracture of 5 mm, the breakthrough pressure of the LBG reached 1.67 MPa, demonstrating effective plugging in the fracture. These features make LBG a promising candidate for effective lost circulation control in HTHP reservoirs.