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Abandon

To plug permanently and salvage equipment from a well. A well is ordinarily abandoned if it is a dry hole or has ceased to produce for some reason, and this condition is believed permanent and beyond repair.

Acidize

To treat a well with acid to dissolve some limestone or other carbonate materials in a producing zone, in order to increase the flow of oil and gas into the well bore.

Ammonia

A colourless gas with a pungent smell and strong alkaline reaction, nitrogen thrihydride NH3. The gas can be condensed to a liquid by severe cooling and pressure. Ammonia is one of the valuable products made principally from natural gas CH4.

Anticline

A subsurface geological structure in the form of a sine curve or an elongated dome. This type of formation is most favourable to accumulation of oil and/or gas.

API Gravity

Gravity of crude oil or other liquid hydrocarbons as measured by a system developed by the American Petroleum Institute.

Artificial Lift

The application of power to lift oil mechanically or otherwise to surface from a producing well.

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