A Novel Polyacrylamide Film-Forming Agent for Maintaining Wellbore Stability

Area of Science:

• Polymer Chemistry
• Materials Science
• Drilling Engineering

Background:

• Well-bore instability during drilling operations poses significant challenges.
• Effective inhibition requires advanced film-forming agents capable of encapsulating reactive materials.

Purpose of the Study:

• To synthesize and characterize a polyacrylamide-based film-forming agent.
• To optimize the agent's composition for maximal colloidal stability and film properties.
• To evaluate its efficacy in encapsulating sodium-bentonite for well-bore stability.

Main Methods:

• Free-radical copolymerization of acrylamide and vinyl acetate with cellulose.
• Fourier-transform infrared (FT-IR) spectroscopy for monomer conversion analysis.
• Systematic variation of component ratios to determine optimal formulation.

Main Results:

• Complete monomer conversion was confirmed by FT-IR spectroscopy.
• Optimal composition identified: 3.7 wt% acrylamide, 1:3 VAc:AM molar ratio, 1.6 wt% cellulose.
• The optimized agent formed coherent, moisture-resistant films and encapsulated sodium-bentonite pellets effectively.

Conclusions:

• The synthesized polyacrylamide-based agent demonstrates excellent film-forming capabilities.
• The optimized formulation significantly enhances colloidal stability.
• This agent shows strong potential as an effective inhibitor for maintaining well-bore stability in drilling operations.