Special Oil & Gas Reservoirs ›› 2026, Vol. 33 ›› Issue (2): 1-11.DOI: 10.3969/j.issn.1006-6535.2026.02.001

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Research progress and development trends of bridging lost-circulation materials

ZHANG Jinfa1,2, FENG Yongcun1,2, MU Xiaolong3, HE Bing1,2, HE Qi4, DENG Jin′gen1,2, WANG Weiqi5   

  1. 1. China University of Petroleum(Beijing),Beijing 102249,China;
    2. State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;
    3. PetroChina Changqing Oilfield Company,No.1 Oil Production Plant,Yan′an,Shaanxi 716000,China;
    4. CNPC Engineering Technology R & D Company Limited,Beijing 102206,China
    5. Yangtze University,Wuhan,Hubei 430100,China
  • Received:2024-10-07 Revised:2026-01-06 Published:2026-07-30

Abstract: Bridging lost-circulation technology is one of the main technologies currently used to control lost circulation;however,under the complex geological conditions of unconventional oil and gas reservoirs,conventional bridging lost-circulation materials show poor adaptability,have a low one-time plugging success rate,and may cause repeated and worsening losses.Therefore,the mechanism of bridging plugging was analyzed,the technical characteristics and development status of various bridging lost-circulation materials were reviewed,and key future research directions were proposed.The results indicate that high-stability composite bridging lost-circulation materials can solve the problem of plugging-layer failure;research should focus on developing high-temperature curable materials and optimizing injection processes.Self-adaptive loss-channel bridging materials can address the mismatch between material size and fracture width;field tests and application promotion should be strengthened.Removable(unplugging)bridging lost-circulation materials can overcome the difficulty of balancing reservoir plugging and reservoir protection;there remains room for improvement in acid-solubility evaluation,acidizing procedure optimization,and regulation of degradability.Biodegradable and environmentally friendly bridging lost-circulation materials have unique environmental advantages,but further research is still needed on optimizing degradation rate and on characterization and control of degradation degree.The results provide technical references for selecting field lost-circulation materials and indicate development directions for bridging lost-circulation materials.

Key words: lost circulation, bridging plugging, plugging-layer stability, self-adaptive loss channel, biodegradation

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