Lexicon of Terms

Learn how to talk like an Oilman
417 Oil & Gas and related investment terms defined.
External casing packer — A device used on the outside of the well casing to seal off formations or protect certain zones. The packer is run on the casing and expanded against the wall of the borehole at the proper depth by hydraulic pressure or fluid pressure from the well.

Extraction plant — A plant for the extraction of the liquid constituents in casinghead gas or wet gas.

Ethanol — The two-carbon-atom alcohol present in the greatest proportion upon fermentation of grain and other renewable resources such as potatoes, sugar, or timber. Also called grain alcohol.

Exploratory well — A well drilled to an unexplored depth or in unproven territory, either in search of a new reservoir or to extend the known limits of a field that is already partly developed.

Electrical well logging — A method of oil exploration that originated with Conrad Schlumberger, who first tested it in 1927 on a 1,500-meter well in France. As used today, the process is very simple. Current passes into the ground, through the resistive medium and into the sonde. The resulting charts show the varying resistance, the conductance, and the self-potential of the strata surrounding the well at every level, and geophysicists use them to assay whether petroleum is present in a formation.

Economic interest — An interest in oil and gas in the ground. It entitles the owner to a deduction from gross income derived from production of that oil and gas as specified in Federal income tax regulations.

Exploration — The search for oil and gas. Exploration operations include: aerial surveys, geophysical surveys, geological studies, core testing and the drilling of test wells.

Enhanced oil recovery — Injection of water, steam, gases or chemicals into underground reservoirs to cause oil to flow toward producing wells, permitting more recovery than would have been possible from natural pressure or pumping alone.

Expenses (Tax Usage) — Expenditures for business items that have no future life (such as rent, utilities, or wages) and are incurred in conducting normal business activities.


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