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Preparation and Characterization of Temperature-Sensitive Gel Plugging Agent.

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A novel cellulose-based temperature-sensitive gel offers superior deep source water control in oil reservoirs. This intelligent gel system exhibits excellent thermal stability and sealing capabilities, enhancing oil recovery rates.

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Area of Science:

  • Petroleum Engineering
  • Polymer Science
  • Materials Science

Background:

  • Conventional gels for water control in oil reservoirs have limitations including high chemical dosage, poor temperature and shear resistance, and limited plugging efficiency.
  • Deep source water control in medium to high water cut reservoirs requires advanced gel systems that overcome these conventional shortcomings.

Purpose of the Study:

  • To develop a novel temperature-sensitive gel system based on natural cellulose for effective deep source water control.
  • To evaluate the temperature resistance, rheological properties, and plugging performance of the developed cellulose-based gel.

Main Methods:

  • Preparation of a temperature-sensitive gel using natural cellulose.
  • High-temperature aging tests to assess viscosity retention.
  • Rheological performance evaluation using rheometer oscillation frequency scanning.
  • Core displacement experiments to determine sealing rate and breakthrough pressure.
  • Infrared spectroscopy to analyze gel microstructure and hydrogen bonding.

Main Results:

  • The developed gel system maintained up to 95% viscosity retention after 50 days of aging at 90-120 °C.
  • Optimal gelation was achieved using medium- to low-salinity calcium chloride formation water.
  • Rheological tests confirmed the gel as a strong elastic body, dominated by elasticity.
  • Core displacement experiments demonstrated a maximum sealing rate of 97% with a breakthrough pressure of 2.5 MPa.
  • Infrared analysis revealed strong hydrogen bonding, indicating good gel stability.

Conclusions:

  • The novel cellulose-based temperature-sensitive gel exhibits excellent thermal stability, rheological properties, and plugging performance.
  • This intelligent gel system effectively addresses the limitations of conventional gels for water control in oil reservoirs.
  • The developed gel system has the potential to significantly improve oil recovery rates in high water cut reservoirs.