Nonconductive Drilling Fluid
Definition - What does Nonconductive Drilling Fluid mean?
Nonconductive Drilling Fluid is mud which does not conduct electricity sufficiently to favor resistivity logging or spontaneous potential logging. Mud which is synthetic-based and oil-based falls under the category of Nonconductive Drilling Fluids. Normal resistivity measurements can never be made in wells filled with Nonconductive Drilling Fluid but the induction logs can be easily run. The oil-based drilling fluid provides water free filtrates and oil-wet surfaces. This fluid contains internal brine phase which is emulsified strongly into non-polar oil phase.
Petropedia explains Nonconductive Drilling Fluid
Any kind of drilling fluid which is usually oil-based or which inverts emulsion with continuous phase that does not conduct electricity is known as Nonconductive Drilling Fluid. In oil-based drilling fluid the normal resistivity and spontaneous potential are not allowed to be logged whereas other logs like induction, gamma rays, acoustic velocity can be run. This fluid is nonconductive hence it blocks the flow of electric current. The responses from the resistivity logging tools of the conventional oil-based mud are nonexistent or poor. The oil based-mud and synthetic-based mud fall in this category but water-based mud does not fall in this category of fluids.