�?�?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 Height of fracture: width of fracture entrance = six: one, the coincidence diploma from the indoor and discipline drilling fluid lost control performance is significant, as well as the evaluation result is superior YK and CX pred