Cellulose nanofiber-stabilized Pickering foam drilling fluids for low-pressure coalbed methane development

Area of Science:

• Materials Science
• Petroleum Engineering
• Nanotechnology

Background:

• Coalbed methane (CBM) reservoirs present drilling challenges due to low formation pressures causing fluid loss.
• Foam drilling fluids offer a solution by reducing hydrostatic pressure and fluid loss.

Purpose of the Study:

• To formulate and evaluate high-performance foam drilling fluids for CBM exploration.
• To investigate the stabilizing effects of different cellulose nanofibers (CNFs) on alkyl polyglucoside (APG) based foams.

Main Methods:

• Formulation of foam drilling fluids using APG as a foaming agent and three types of CNFs (M-CNFs, T-CNFs, L-CNFs) as stabilizers.
• Evaluation of foam stability, rheological properties, and filtration characteristics.
• Analysis of the synergistic interactions between APG and T-CNFs.

Main Results:

• TEMPO-oxidized CNFs (T-CNFs) demonstrated superior foam stabilization compared to mechanically treated CNFs (M-CNFs) and lignin-containing CNFs (L-CNFs).
• Synergistic effects between APG and T-CNFs reduced surface tension, created smaller bubbles, and increased liquid film viscosity.
• The T-CNF-stabilized Pickering foam exhibited excellent rheological and filtration properties.

Conclusions:

• Biomass-derived nanomaterials, specifically T-CNFs, can effectively stabilize foam drilling fluids.
• This technology offers a sustainable and efficient approach for environmentally friendly CBM exploration.
• The developed foam drilling fluid enhances performance in challenging low-pressure CBM reservoirs.