�?�?t ε l ρ l v l + �?�?ε l ρ l v l v l = ε l �?�?τ l + ε l ρ l g �?ε l �?p �?β v l �?v s Even though most well-liked, stopping lost circulation wholly isn't often probable or needed. Controlled losses make it possible for drilling to carry on whilst trying to keep the wellbore full, avoiding an influx of gasoli