18 July 2017

Unit operator

The oil company in charge of development and production in an oilfield in which several companies have joined to produce the field.
25 July 2017

Upper racking arm

Functionally replaces the derrickman in guiding pipe from the set-back to the travelling equipment. Some systems have hoist mechanisms and some work in conjunction with an […]
18 July 2017

Usable fluid

The hydraulic fluid volume recoverable from the accumulator system between the maximum charging pressure and the minimum operating pressure of the accumulator. The minimum operating pressure […]
18 July 2017

V-belt

A belt with a trapezoidal cross section, made to run in sheaves, or pulleys, with grooves of corresponding shape.
18 July 2017

V-door (window)

An opening in a side of a standard derrick at the floor level having the form of an inverted V. This opening is opposite the drawworks. […]
18 July 2017

Vacuum

A void; an absence of matter of any kind. Complete vacuum is not attained, but a partial vacuum or reduction in pressure through suction is achieved […]
18 July 2017

Valve

A device used to control the rate of flow in a line to open or shut off a line completely, or to serve as an automatic […]
25 July 2017

Viscosity

A measure of a liquid’s resistance to flow. The viscosity of petroleum products or mud is usually expressed and measured by the time it takes for […]
18 July 2017

Vug

1) a cavity in a rock. 2) a small cavern, larger that a pore but too small to contain a person. Typically found in limestone subject […]
18 July 2017

Wall cake

Also called filter cake or mud cake. See filter cake.
18 July 2017

Water string

A string of casing used to shut off all water above an oil sand. It is often necessary to run more than one string before a […]
18 July 2017

Water table

The underground level at which water is found. This term is often used in connection with underground water supplies used for irrigation and industrial plants. Term […]