�?�?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 Once the dip angle with the fracture is 0.five, the coincidence degree in the indoor and subject drilling fluid lost control effectiveness is larger, plus the evaluation outcome is best These actions successfully mitigate the ris