A bell-shaped hole dug beneath a pipeline to provide room for use of tools by workers,

To cease efforts to produce oil or gas from a well , and to plug a depleted formation and salvage all material and equipment.

To soak up as a sponge takes water.

The treatment of formations with hydrochloric or other type acids in order to increase production or injection.

The attraction exhibited by the surface of a solid for a liquid or a gas when they are in contact.

Abbreviation for American Petroleum Institute

The standard adopted by API for measuring the density of a liquid, expressed in degrees.

The standard adopted by API for measuring the density of a liquid, expressed in degrees.

Natural gas which is in contact with crude oil in the reservoir.

A water-bearing rock strata. In a water-drive field the aquifer is the water zone of the reservoir underlying the oil zone.