�?�?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 sConsidering that more than one form of drilling fluid loss can current in some cases, it's important to determine the loss varieties and review proportion of every loss type In order to find out the foremost and secondary loss kind