�?�?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 Height of fracture: width of fracture entrance = six: one, the coincidence degree in the indoor and field drilling fluid lost control performance is higher, along with the evaluation result is excellent I comply with get