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<p>Fractures of different widths are formed during the sandstone fracturing process, and these fractures are the main channels for oil and gas flow after fracturing. However, the polymers injected into the well have a certain size and will block the micro – fractures formed by fracturing, thus affecting the hydraulic fracturing effect. This paper establishes a set of experimental methods to test the blocking situation of polymers in fractures of different widths and analyzes the principle of polymer blocking micro - fractures from a microscopic perspective. Fracture width, polymer concentration and temperature all have an impact on fracture damage. Especially, the results show that when the width of micro-fractures is less than 10 μm, the blocking effect of polymers is the strongest, and the hydrogen bonds between polymers and rock surfaces are the main reasons for the blocking effect of polymers. A plate of polymerinduced damages to different fractures has been formed, which enables an intuitive understanding of the damage situation of polymers injected into wells on fractures.</p>

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Study on Fracture Damage Caused by Polymer Fracturing Fluid to Sandstone with Different Fracture Widths

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Yuanxing Mei,
  • Shibin Wang,
  • Nanpeng Yang,
  • Yu Peng,
  • Ying Fu,
  • Chengcheng Liu,
  • Peng Shi,
  • Haidong Wang

摘要

Fractures of different widths are formed during the sandstone fracturing process, and these fractures are the main channels for oil and gas flow after fracturing. However, the polymers injected into the well have a certain size and will block the micro – fractures formed by fracturing, thus affecting the hydraulic fracturing effect. This paper establishes a set of experimental methods to test the blocking situation of polymers in fractures of different widths and analyzes the principle of polymer blocking micro - fractures from a microscopic perspective. Fracture width, polymer concentration and temperature all have an impact on fracture damage. Especially, the results show that when the width of micro-fractures is less than 10 μm, the blocking effect of polymers is the strongest, and the hydrogen bonds between polymers and rock surfaces are the main reasons for the blocking effect of polymers. A plate of polymerinduced damages to different fractures has been formed, which enables an intuitive understanding of the damage situation of polymers injected into wells on fractures.