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<p>Condensate blockage has been restricting the production of condensate gas reservoirs, and the development of technology to relieve blockage and efficient development has been in focus. In this paper, the idea of acid couple microemulsion (AME) was carried out to relieve condensate blockage from Pinghu Formation in the Kongqueting gas field of Xihu Sag, East China Sea. The surface tension, particle size, and micromorphology of AME were evaluated using surface tension instrumentation, transmission electron microscopy, and laser particle size measurement. Then the optimum AME was selected by dissolution experiment, low-temperature nitrogen adsorption, wetting inversion and core flow test. The results show that the optimum AME formulation obtained in this paper is 1% microemulsion + 10% hydrochloric acid + 5% formic acid + 1.5% citric acid + 1.5% corrosion inhibitor. The nanoparticle size and ultra-low surface tension of AME enable it to improve the sandstone’s wettability and enhance its capacity to wash condensate oil. The average pore size of sandstone increases the most by AME erosion when shut-in time is 8&#xa0;h. Moreover, condensate-blocked sandstone permeability is dramatically improved after AME treatment, which can provide ideas for reliving condensate blockage.</p>

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Experimental study of acid couple microemulsion to release blockage in condensate gas reservoirs

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Yi Lin,
  • Xiangjun Liu,
  • Xiangchen Li,
  • Fan Zhang,
  • Shan Yang

摘要

Condensate blockage has been restricting the production of condensate gas reservoirs, and the development of technology to relieve blockage and efficient development has been in focus. In this paper, the idea of acid couple microemulsion (AME) was carried out to relieve condensate blockage from Pinghu Formation in the Kongqueting gas field of Xihu Sag, East China Sea. The surface tension, particle size, and micromorphology of AME were evaluated using surface tension instrumentation, transmission electron microscopy, and laser particle size measurement. Then the optimum AME was selected by dissolution experiment, low-temperature nitrogen adsorption, wetting inversion and core flow test. The results show that the optimum AME formulation obtained in this paper is 1% microemulsion + 10% hydrochloric acid + 5% formic acid + 1.5% citric acid + 1.5% corrosion inhibitor. The nanoparticle size and ultra-low surface tension of AME enable it to improve the sandstone’s wettability and enhance its capacity to wash condensate oil. The average pore size of sandstone increases the most by AME erosion when shut-in time is 8 h. Moreover, condensate-blocked sandstone permeability is dramatically improved after AME treatment, which can provide ideas for reliving condensate blockage.