Oil Emulsion Mud
Definition - What does Oil Emulsion Mud mean?
Oil Emulsion Mud, also known as water-based mud or oil in water emulsion is an oilfield emulsion which is used as a drilling fluid while performing drilling operations. In this type of oilfield emulsion, water is present as a continuous phase (or in large amount) and oil is present in the dispersed phase in low amounts of approximately 2% to 5%.
Petropedia explains Oil Emulsion Mud
There are two types of oilfield emulsions that are used as drilling fluids during drilling operations, i.e., oil-based mud, also called invert-emulsion oil mud or water in oil emulsion and water based mud, also called oil emulsion mud or oil in water emulsion.
Oil Emulsion mud is usually less expensive than oil based mud and does not harm the environment and underground water aquifers. Thus, it is environment friendly to use, however, it is less effective than oil based mud. In oil emulsion mud, the base fluid can be either fresh water, brine (saturated brine or a formate brine) or seawater.