1) a well drilled in proven territory in a field to complete a pattern of production. 2) an exploitation well.

Departure of the wellbore from the vertical, measured by the horizontal distance from the rotary table to the target. The amount of deviation is a function […]

An operation made to determine the angle from which a bit has deviated from the vertical during drilling. There are two basic deviation-survey, or drift-survey, instruments; […]

A drilling bit that has a steel body surfaced with a matrix and industrial diamonds. Cutting is performed by the rotation of the very hard diamonds […]

A high-compression, internal-combustion engine used extensively for powering drilling rigs.

The power supplied to a drilling rig by diesel engines driving electric generators; used widely.

Intentional deviation of a wellbore from the vertical. Although wellbores are normally drilled vertically, it is sometimes necessary or advantageous to drill at an angle from […]

The first oil or gas well drilled in a new field that reveals the presence of a hydrocarbon-bearing reservoir. Subsequent wells are development wells. Compare development […]

A BOP control system that utilizes pilot hoses from the surface to transmit hydraulic pressure signals to activate pilot operate valves assigned to functions on the […]

In oilwell cementing, the fluid, usually drilling mud or salt water, that is pumped into the well after the cement is pumped into it to force […]

1) a small enclosure on the rig floor used as an office for the driller and as a storehouse for small objects. 2) any small building […]

A term applied to a sharp change in direction of the wellbore, usually resulting in abnormal fatigue to the drill stem and frequently resulting in key […]