�?�?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 Given that multiple sort of drilling fluid loss can present in some cases, it's important to find out the loss varieties and analyze proportion of each and every loss form so as to determine the main and secondary loss forms. The Co