The drilling fluid is typically a mixture of water and bentonite and may also contain small quantities of diesel fuel and other additives necessary to maintain the mud's physical properties.
(The drilling fluid; is typically; a mixture of water and bentonite) (The drilling fluid; may also contain; small quantities of diesel fuel and other additives necessary to maintain the mud's physical properties)
The drilling fluid The drilling fluid
is typically may also contain
a mixture of water and bentonite
small quantities of diesel fuel and other additives necessary to maintain the mud's physical properties