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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Physical Chemistry

Background:

  • Current clean fracturing fluids lack sufficient heat resistance for ultra-high temperature reservoirs.
  • Developing advanced fluid systems is crucial for efficient hydrocarbon extraction in extreme environments.

Purpose of the Study:

  • To design and synthesize a novel cationic surfactant (VES-T) for enhanced thermal stability in fracturing fluids.
  • To evaluate the performance of VES-T based fluids, particularly their rheological properties and thermal resistance.

Main Methods:

  • Synthesis of a novel cationic surfactant (VES-T) with a unique molecular structure.
  • Formulation of VES-T fluids with varying concentrations (3-5 wt%) in the presence of NaSal.
  • Comprehensive evaluation of rheological properties, thermal stability (140-180 °C), viscoelasticity, and proppant-suspending capability.

Main Results:

  • VES-T fluids demonstrated excellent thermal stability up to 180 °C, surpassing existing VES fracturing fluids.
  • The fluids exhibited good viscoelasticity and proppant-suspending capability due to a 3D network of entangled wormlike micelles.
  • Complete gel breaking was achieved within 2 hours using standard brines.

Conclusions:

  • The synthesized VES-T surfactant significantly improves the heat resistance of clean fracturing fluids.
  • VES-T based fluids show great potential for applications in ultra-high temperature reservoir development.
  • The unique micellar network structure contributes to the fluid's desirable performance characteristics.