18 July 2017

Wind-load rating

A specification of a derrick used to indicate the resistance of the derrick to the force of wind. The wind load rating is calculated according to […]
18 July 2017

Wire rope

A cable composed of steel wires twisted around a central core of fiber or steel wire to create a rope of great strength and considerable flexibility. […]
18 July 2017

Wireline

A slender, rodlike or threadlike piece of metal, usually small in diam, that is used for lowering special tools (such as logging sondes, perforating guns, and […]
18 July 2017

Working Pressure (WP)

The normal operating pressure to which a component is designed to operate continuously with a safe drilling margin below the point at which the material will […]
18 July 2017

Workover

To perform one or more of a variety of remedial operations on a producing oil well with the hope of restoring or increasing production. Examples of […]
18 July 2017

Worm

1) a new and inexperienced worker on a drilling rig. 2) a short revolving screw with spiral shaped-threads.
18 July 2017

Yield

A term used to define the quality of a clay by describing the number of barrels of a given centipoise slurry that can be made form […]
18 July 2017

Yield point

In drilling-fluid terminology, yield point means yield value (see yield value). Of the two terms, yield point is more common.
25 July 2017

Yield value

The yield value (commonly called “yield point”) is the resistance to initial flow, or represents the stress required to start fluid movement. This resistance is due […]
18 July 2017

Zero-zero gel

A condition wherein the drilling fluid fails to form measurable gels during a quiescent time interval (usually 10 min).
18 July 2017

Zeta potential

The electrokinetic potential of a particle as determined by its electrophoretic mobility. This electric potential causes colloidal particles to repel each other and stay in suspension.
25 July 2017

Zinc chloride

ZnCl2 – A very soluble salt used to increase the density of water to points more than double that of water. Normally added to a system […]