Indicators of cutting removal efficiency when drilling directional wells

Borehole cleaning is still a major challenge for most directional wells despite significant progress achieved in drilling fluids, tools and field practice, as well the development of academic industry research. Insufficient borehole causes undesirable phenomena form various complications. Therefore, purpose conducted research was to present main correlations that determine nature degree annular eccentric space analyze these presented indicators order improve them. The object mechanics cuttings removal from an inclined or horizontal well. In frameworks this mathematically displayed reflecting one another physical aspect process. methodology consists analysis composition indicators, evaluation significance indicator constituents, identification quantitative contribution destruction products while sinking borehole. study resulted introduction following indicators: equivalent circulation density, slip velocity index. essence their mathematical shown with focus on velocity. definition latter, which widely accepted among specialists indicates rate washing cutting particles by fluid during its transportation day-light surface. This ones hydrodynamics transport To simplify calculation indicator, it proposed use dimensionless Lyashchenko criterion.