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On Improving Water-Based Drilling Mud Swelling Control Using Modified Poly(Vinyl Alcohol)s.

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This study introduces modified polyvinyl alcohols (PVOH) to water-based muds (WBM) to combat high-temperature, high-pressure drilling challenges. Nonionic polymers significantly improved mud filtration and stability, outperforming cationic polymers.

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Polymer Chemistry

Background:

  • Wellbore instability in high-temperature, high-pressure (HT/HP) drilling is a critical challenge.
  • Clay swelling and drilling fluid loss exacerbate wellbore instability.
  • Polyvinyl alcohol (PVOH) derivatives are explored as additives to mitigate these issues.

Purpose of the Study:

  • To evaluate the effectiveness of nonionic and cationic modified polyvinyl alcohols (PVOH) in water-based muds (WBM) for HT/HP drilling.
  • To assess the impact of PVOH on mud rheology, specific gravity, and filtration characteristics at elevated temperatures.
  • To determine the adsorption behavior of PVOH polymers on clay particles.

Main Methods:

  • Preparation of nonionic and cationic PVOH polymers.
  • Introduction of PVOH into WBM at varying concentrations (0.08, 0.28, 0.49 wt.%).
  • Experimental analysis of specific gravity, mud rheology, and filtration at temperatures of 25, 55, and 85 °C.
  • Thermogravimetry analysis (TGA) for thermal stability assessment.

Main Results:

  • Mud specific gravity and rheology decreased monotonically with increasing temperature.
  • Nonionic PVOH enhanced mud filtration by up to 34.7%, significantly more than cationic PVOH.
  • Nonionic polymers exhibited higher adsorption onto clay particles (118.9 mg/g) compared to cationic polymers (84.51 mg/g).

Conclusions:

  • Modified PVOH polymers, particularly nonionic types, show promise in improving drilling fluid performance under HT/HP conditions.
  • Nonionic PVOH effectively reduces fluid loss and enhances mud cake quality.
  • The study demonstrates the potential of tailored polymer additives for stabilizing wellbores in challenging drilling environments.