�?�?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 decrease in annular return flow will cause the circulation pace of drilling fluid https://willaa826drj9.thecomputerwiki.com/user