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In view of the shortcomings of phosphate ester/Al3+ crosslinked oil-based gel, such as slow crosslinking speed, slow solubility of crosslinking agent, poor stability and high price, the phosphate ester/Fe3+crosslinked oil-based gel system was studied for the first time. By optimizing the iron crosslinker system, a new crosslinker system of phosphate/Fe3+crosslinker was screened, and the performance of phosphate/Fe3+oil-based gel was evaluated. The results show that the new crosslinking agent system prepared by 30% Fe2 (SO4)3+ 15% diethanolamine + 55% water can be directly mixed with phosphate to form oil-based gel, and its performance is not affected by the storage time. The crosslinking speed is fast and the gel forming performance is good, The maximum viscosity can be reached in 10 min; The gel has high temperature resistance and shear resistance. Compared with the conventional aluminum cross-linking agent system, the speed of gel formation has increased by 20 times, the temperature resistance of gel has increased from 100 ℃ to 135 ℃, and the gel breaking and filtration properties of gel can meet the construction requirements.

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Performance Research of Oil-Based Gel Based on the Phosphates and Trivalent Iron

  • 会议论文

  • 发表日期：

    2025年

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  • Yang Wen,
  • Zuo Zhiheng,
  • Li Seng,
  • Xuefan Gu,
  • Liang Jingying

摘要

In view of the shortcomings of phosphate ester/Al3+ crosslinked oil-based gel, such as slow crosslinking speed, slow solubility of crosslinking agent, poor stability and high price, the phosphate ester/Fe3+crosslinked oil-based gel system was studied for the first time. By optimizing the iron crosslinker system, a new crosslinker system of phosphate/Fe3+crosslinker was screened, and the performance of phosphate/Fe3+oil-based gel was evaluated. The results show that the new crosslinking agent system prepared by 30% Fe2 (SO4)3+ 15% diethanolamine + 55% water can be directly mixed with phosphate to form oil-based gel, and its performance is not affected by the storage time. The crosslinking speed is fast and the gel forming performance is good, The maximum viscosity can be reached in 10 min; The gel has high temperature resistance and shear resistance. Compared with the conventional aluminum cross-linking agent system, the speed of gel formation has increased by 20 times, the temperature resistance of gel has increased from 100 ℃ to 135 ℃, and the gel breaking and filtration properties of gel can meet the construction requirements.