Coiled Tubing Glossary...

OD: Outside diameter

Oil Based Mud: drilling mud in which oil is the continuous phase; e.g., oil-base mud and invert-oil mud.

Open Hole: A wellbore, having no casing.

Opening Ratio: The ratio of the well pressure to the hydraulic actuation pressure required to open the well control component.

Outside Cementing: a secondary cementing method conducted to fill the annulus completely; also called "top job" or "one-inch" job.

Ovality: The difference between the largest and smallest outside diameter on a cross-section.

Overbalance: The extent to which the hydrostatic pressure of the fluid column exceeds the formation pressure.

Overburden Pressure: The pressure exerted by the overburden on the formation of interest

Overburden: The strata of rock that lies above the zone of interest.

Overflush: The fluid over and above the volume required to displace a fluid to a desired point in tubulars or openhole.

Please inform ICoTA to add a glossary term.