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<p>Effective development of low permeability reservoirs is one of the key challenges to improve oilfield recovery. Aiming at the development challenges of typical low-permeability reservoirs in the Ordos Basin, this paper explores the action mechanism and key influencing factors of chemical oil repulsion through systematic core replacement experiments. Sodium dodecylbenzene sulfonate (SDBS), polyacrylamide (HPAM), sodium hydroxide (NaOH) and sodium chloride (NaCl) were used to form a composite chemical agent system. The results show that the chemical drive technology can significantly increase the cumulative oil production compared with the traditional water drive. When the mass fraction of surfactant is 1.0%, the interfacial tension between oil and water is reduced to 10 mN/m, and the oil repulsion efficiency is increased to 85%; when the mass fraction of polymer is 0.3%, the relative repulsion efficiency is increased to 1.3 times; the chemical repulsion can effectively improve the pore structure of the rock, so that the porosity of the core samples is increased from 15% to 20%, and the permeability is increased from 49 mD to 76 mD; the alkaline chemical agent and salt chemical agent can further improve the recovery rate, especially when the mass fraction of alkaline chemical agent reaches 1.5% and the mass fraction of salt chemical agent reaches 0.3%, the percentage of recovery rate improvement reaches 12.8% and 13.9% respectively. The potential of chemical additives oil repellent technology in improving mechanical oil recovery in low permeability reservoirs provides theoretical basis and technical support for practical application.</p>

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Research on the Supporting Technology of Mechanical Oil Recovery with Chemical Additives

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Junlin Ren,
  • Xinmin Shao,
  • Zhenmao Tian,
  • Qian Wang,
  • Quanli Ju,
  • Zicheng Xiong,
  • Junke Sun,
  • Hao Qu,
  • Mingjun Xu

摘要

Effective development of low permeability reservoirs is one of the key challenges to improve oilfield recovery. Aiming at the development challenges of typical low-permeability reservoirs in the Ordos Basin, this paper explores the action mechanism and key influencing factors of chemical oil repulsion through systematic core replacement experiments. Sodium dodecylbenzene sulfonate (SDBS), polyacrylamide (HPAM), sodium hydroxide (NaOH) and sodium chloride (NaCl) were used to form a composite chemical agent system. The results show that the chemical drive technology can significantly increase the cumulative oil production compared with the traditional water drive. When the mass fraction of surfactant is 1.0%, the interfacial tension between oil and water is reduced to 10 mN/m, and the oil repulsion efficiency is increased to 85%; when the mass fraction of polymer is 0.3%, the relative repulsion efficiency is increased to 1.3 times; the chemical repulsion can effectively improve the pore structure of the rock, so that the porosity of the core samples is increased from 15% to 20%, and the permeability is increased from 49 mD to 76 mD; the alkaline chemical agent and salt chemical agent can further improve the recovery rate, especially when the mass fraction of alkaline chemical agent reaches 1.5% and the mass fraction of salt chemical agent reaches 0.3%, the percentage of recovery rate improvement reaches 12.8% and 13.9% respectively. The potential of chemical additives oil repellent technology in improving mechanical oil recovery in low permeability reservoirs provides theoretical basis and technical support for practical application.