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Area of Science:

  • Geology and Petroleum Engineering
  • Materials Science
  • Fluid Mechanics

Background:

  • Zhina coalfield has significant coalbed methane (CBM) resources with complex coal-body characteristics.
  • Drilling in upper coal-bearing formations faces wellbore instability issues like spalling and collapse.
  • Reservoir damage mechanisms in CBM drilling require effective mitigation strategies.

Purpose of the Study:

  • To investigate reservoir damage mechanisms in CBM drilling.
  • To develop a plugging-type solid-free drilling fluid system for enhanced wellbore stability.
  • To optimize fluid loss reduction and sealing capabilities in CBM formations.

Main Methods:

  • Core analysis using X-ray diffraction (XRD) and scanning electron microscopy (SEM).
  • Hydration stability and mechanical property tests on coal and adjacent strata cores.
  • Development and characterization of a novel fluid loss reducer and viscosifier (AMSN).
  • Sand bed plugging tests and rheological property evaluation of the drilling fluid system.

Main Results:

  • AMSN, a high molecular weight polymer, forms a stable 3D network, enhancing viscosity and thermal resistance.
  • The developed drilling fluid system demonstrated excellent plugging capability (0 mL filtration volume) and lubricity.
  • Field applications confirmed reduced wellbore enlargement and improved cementing quality in collapse-prone coal seams.

Conclusions:

  • The developed plugging-type solid-free drilling fluid system effectively enhances wellbore stability in CBM wells.
  • AMSN significantly improves fluid loss control, sealing, and thermal resistance, crucial for CBM drilling.
  • The optimized system mitigates coal seam damage and improves overall drilling efficiency and well integrity.