�?�?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 paper will include the following most important matters: Deep perfectly drilling technologies are of significant value from the drilling business. In this process, the drilling fluid (drilling mud) is utilized to take c