Glossary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Wellhead

The equipment installed at the surface of the wellbore. A wellhead includes such equipment as the casinghead, tubing hanger, and various valves to control flow from the well.

Wet gas

A gas containing condensable hydrocarbons or other liquids. The term is subject to varying legal definitions as specified by applicable statutes. Natural gasoline, butane, pentane and other light hydrocarbons can be removed by chilling and pressure or extraction. Usually maximum allowable is 7 pounds/mmcf for water content and 0.02 gallons/mmcf for natural gasoline.

Wobbe Index

Represents a measure of the heat released when a gas is burned at a constant pressure, and is defined as the gross calorific value divided by the square root of the density of the gas relative to the density of air.

Working gas

Volume of natural gas expected to be cycled from a gas-storage facility.