Analysis of water-sensitive strata and application research of film-forming drilling fluid in Dongbeizhai Gold Mine， Songpan County

Abstract:

To solve the problems of difficult drilling， low efficiency and frequent downhole accidents in water-sensitive strata of gold mines， this study takes the Dongbeizhai Gold Mine in Songpan County as a case study， conducting strata analysis and experimental research on the application of film-forming drilling fluid . Starting from rock composition， structure， and mineral composition， the root cause of water sensitivity is analyzed， revealing the mechanisms of clay mineral swelling， hydration dispersion， and microstructural changes. Focusing on the formulation of the film-forming drilling fluid ， laboratory and field tests were carried out to study multiple comparative experimental formulations. The effects of different additives and the comprehensive performance of various combinations were analyzed， verifying the superior properties of the film-forming drilling fluid . Reasonable combinations synergistically leverage the advantages of each material， with stable rheology， excellent inhibition， and appropriate fluid loss control， meeting the demands of complex drilling conditions and achieving the desired drilling outcomes. This research provides theoretical support and technical solutions of drilling fluid for drilling in water-sensitive gold mine strata， contributing to improved drilling efficiency in similar mining areas.