�?�?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 s Peak of fracture: width of fracture entrance = six: 1, the coincidence degree with the indoor and area drilling fluid lost control effectiveness is higher, and also the analysis result is fantastic The characteristic tha