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<p>Hydrogel-based materials have emerged as promising candidates for lost circulation control based on their excellent injectability and sealing performances, however, they face problems such as difficult-to-control gelation times and low compressive strength after curing under high-temperature and high-pressure (HTHP) conditions. Herein, we constructed a novel curable hydrogel composed of acrylamide (AM), sodium p-styrenesulfonate (SSS) and sodium lignosulfonate (LS), denoted as P(AM-co-SS)/LS hydrogel for HTHP plugging applications. This hydrogel was synthesized via a one-pot thermal polymerization strategy under harsh conditions (150&#xa0;°C/20&#xa0;MPa), forming a dense three-dimensional crosslinked network, in which the mechanical performance and gelation behavior were effectively regulated by tailoring the polymer composition and the initiator–inhibitor balance. Experimental results demonstrated that the P(AM-co-SS)/LS hydrogel exhibited remarkable thermal stability, great mechanical strength (compressive strength up to 6.88&#xa0;MPa and compressive strain exceeding 90%), and tunable gelation time ranging from 52&#xa0;min to 3&#xa0;h 12&#xa0;min. Moreover, in wedge-shaped fractures with a width of 5&#xa0;mm, the breakthrough pressure of P(AM-co-SS)/LS hydrogel reached 3.5&#xa0;MPa, which manifests effective plugging in the fracture. This work offers a robust gel design strategy for HTHP lost circulation control and holds significant promise for complex subsurface sealing applications.</p>

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A high-strength hydrogel with tunable gelation time for high-temperature and high-pressure plugging applications

  • 期刊论文

  • 发表日期：

    2026年4月15日

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

摘要

Hydrogel-based materials have emerged as promising candidates for lost circulation control based on their excellent injectability and sealing performances, however, they face problems such as difficult-to-control gelation times and low compressive strength after curing under high-temperature and high-pressure (HTHP) conditions. Herein, we constructed a novel curable hydrogel composed of acrylamide (AM), sodium p-styrenesulfonate (SSS) and sodium lignosulfonate (LS), denoted as P(AM-co-SS)/LS hydrogel for HTHP plugging applications. This hydrogel was synthesized via a one-pot thermal polymerization strategy under harsh conditions (150 °C/20 MPa), forming a dense three-dimensional crosslinked network, in which the mechanical performance and gelation behavior were effectively regulated by tailoring the polymer composition and the initiator–inhibitor balance. Experimental results demonstrated that the P(AM-co-SS)/LS hydrogel exhibited remarkable thermal stability, great mechanical strength (compressive strength up to 6.88 MPa and compressive strain exceeding 90%), and tunable gelation time ranging from 52 min to 3 h 12 min. Moreover, in wedge-shaped fractures with a width of 5 mm, the breakthrough pressure of P(AM-co-SS)/LS hydrogel reached 3.5 MPa, which manifests effective plugging in the fracture. This work offers a robust gel design strategy for HTHP lost circulation control and holds significant promise for complex subsurface sealing applications.