International Association of Drilling Contractors. IADC has exclusively represented the worldwide oil and gas drilling industry since 1940. IADC is a membership organization that represents companies […]

In machinery an idler pulley or sprocket is used in connection with belt drive and chain drive respectively to maintain desired tension on the belt or […]

The trade name of an instrument used to determine whether or not the well bore is proceeding in a vertical orientation at any point. In most […]

See Kick.

According to Webster, any agent which inhibits or prevents. In drilling and producing operations, it usually refers to corrosion inhibitor. Corrosion inhibitors are used widely in […]

A floating offshore drilling structure consisting of a barge on which the drilling equipment is constructed. When moved from one location to another, the barge floats. […]

The power that is put into a usable unit, operating system, or piece of equipment.

Any one of several types of valve installed in the drill stem to prevent a blowout through the stem. Flow is possible only downward, allowing mud […]

A device or assembly of devices designed for one or more of the following functions: to measure operating variables (such as pressure, temperature, rate of flow, […]

An enclosure for remotely controlling equipment. Generally (but not always) used to describe a Driller’s cabin. The enclosure typically includes both controls and instrumentation at an […]

The string of casing set in a well after the surface casing but before production casing is set to keep the hole from caving and to […]