�?�?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 Figure 7 demonstrates the pressure and velocity cloud map inside the coupled wellbore–fracture system in the meanwhile of loss. The force from the drill pipe and annulus isn't going to change noticeably, nevertheless the