| http://www.w3.org/ns/prov#value | - Specific drilling fluid systems are selected to optimize a drilling operation in accordance with the characteristics of a particular geological formation. [0006] Oil or synthetic fluid-based muds are normally used to drill swelling or sloughing shales, salt, gypsum, anhydrite or other evaporate formations, hydrogen sulfide-containing formations, and hot (greater than about 300 degrees Fahrenheit (
|
