GLOSSARY

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Well

A hole drilled or bored into the earth, usually cased with metal pipe, for the production of gas or oil. A hole for the injection under pressure of water or gas into a subsurface rock formation.

Well logging

Recording information about subsurface geological formations; methods include records kept by the driller, mud and cutting analysis, drill stem tests and electric and radioactivity procedures

Wildcat

Well drilled in unproven territory

Workover

Operation on a shut-in or producing well to restore or increase its production

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