�?�?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 The all-natural fractures encountered in the particular drilling approach are not parallel fractures with a uniform width https://vertechs21.wordpress.com/2026/04/24/enhancing-drilling-efficiency-the-role-of-fluid-rheology-in-realology-monitoring-systems/