�?�?t ρ l k + �?�?x i ρ l k v l = �?�?x j μ + μ t σ k �?k �?x j + G k �?ρ l ε �?Y M Although chosen, halting lost circulation fully just isn't usually probable or essential. Controlled losses permit drilling to continue even though retaining the wellbore entire, blocking an inflow of gas or fluid in to the wellbore