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UCST-Activated Network Reinforcement in Hybrid Microgels for Smart Plugging.

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Summary
This summary is machine-generated.

A novel smart microgel (SUPA) offers robust deep-well plugging by adapting to high temperatures. This Upper Critical Solution Temperature (UCST)-responsive material enhances mechanical integrity and sealing efficiency in challenging downhole environments.

Keywords:
UCSTdynamic network reinforcementhigh-temperature plugginghybrid microgellost circulation materialstimuli-responsive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Petroleum Engineering

Background:

  • Conventional polymer plugging materials degrade in deep wells due to heat, compromising performance.
  • Effective lost circulation control is critical for deep-well drilling operations.

Purpose of the Study:

  • To develop a novel smart microgel (SUPA) for adaptive plugging in deep-well environments.
  • To investigate the Upper Critical Solution Temperature (UCST)-responsive mechanism for enhanced material performance.

Main Methods:

  • Synthesis of a dual-crosslinked hybrid microgel incorporating NAGA and HPMA functional units.
  • Characterization using particle size analysis and oscillatory rheology in saline solutions.
  • Evaluation of sealing performance in fractured models under high temperature (150 °C) and pressure (5 MPa).

Main Results:

  • The SUPA microgel demonstrated UCST responsiveness, leading to polymer chain extension and volumetric expansion upon heating.
  • A significant ~7.5-fold increase in storage modulus (G') indicated dynamic network reinforcement.
  • SUPA-enhanced fluids showed improved rheological properties, including a 4.4-fold increase in low-shear viscosity and excellent thixotropic recovery.
  • Reliable and highly efficient sealing was achieved under simulated deep-well conditions.

Conclusions:

  • The developed UCST-responsive hybrid microgel (SUPA) provides a robust solution for lost circulation control.
  • The mechanism-driven design strategy of UCST-activated network reinforcement is validated for harsh environments.
  • SUPA offers a promising alternative to conventional plugging materials for deep-well applications.