�?�?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 type of drilling fluid loss can current sometimes, it's important to find out the loss forms and analyze proportion of every loss type In order to find out the foremost and secondary loss varieties. T