�?�?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 The lessen in annular return flow will trigger the move speed of drilling fluid https://try-here01008.wikitron.com/2403695/the_fact_about_loss_circulation_control_that_no_one_is_suggesting