�?�?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 Even though most well-liked, halting lost circulation fully will not be always doable or expected. Controlled losses let drilling to continue while trying to keep the wellbore complete, blocking an influx of gas or fluid into the we