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B-22
TERM DEFINITION
Gas, Acid The hydrogen sulfide and/or carbon dioxide contained in, or extracted from, gas
or other streams.
Gas, Associated Gas produced in association with oil, or from a gas cap overlying and in contact
with the crude oil in the reservoir. In general, most states restrict associated
gas production since its indiscriminate production could reduce the ultimate oil
recovery. Also, since some wells producing associated gas cannot be shut-in
without also shutting-in the oil production, natural gas pipelines are generally
required to take associated gas produced from oil wells on a priority basis.
Gas, C1 See Methane.
Gas, C2 See Ethane.
Gas, C3 See Propane.
Gas, C5+ Pentanes Plus (IC5, NeoC5, NC5 and C6+)
Gas, C6+ Hexanes Plus (C6, C7, C8, C9, C10, C11, etc.).
Gas, CO2 See Carbon Dioxide.
Gas, Dry Gas whose water content has been reduced by a dehydration process. Gas
containing little or no hydrocarbons commercially recoverable as liquid product.
Specified small quantities of liquids are permitted by varying statutory
definitions in certain states.
Gas, IC4 See Iso-Butane.
Gas, IC5 See Iso-Pentane.
Gas, Liquefied Petroleum
(LPG) A gas containing certain specific hydrocarbons which are gaseous under
normal atmospheric conditions but can be liquefied under moderate pressure at
normal temperatures. Propane and butane are the principal examples.
Gas, Manufactured A gas obtained by destructive distillation of coal, or by the thermal
decomposition of oil, or by the reaction of steam passing through a bed of
heated coal or coke, or catalyst beds. Examples are coal gases, coke oven
gases, producer gas, blast furnace gas, blue (water) gas, and carbureted water
gas. Btu content varies widely.
Gas, Natural A naturally occurring mixture of hydrocarbon and non-hydrocarbon gases found
in porous geologic formations beneath the earth's surface, often in association
with petroleum. The principal constituent is methane.
Gas, NC4 See Normal Butane.
Gas, NC5 See Normal Pentane.
Gas, NeoC5 See Neo-Pentane.
Gas, Non-associated Free natural gas not in contact with, nor dissolved in, crude oil in the reservoir.
Gas, Oil A gas resulting from the thermal decomposition of petroleum oils, composed
mainly of volatile hydrocarbons and hydrogen. The true heating value of oil gas
may vary between 800 and 1600 Btu per cubic foot depending on operating
conditions and feedstock properties.
Gas, Sour Gas found in its natural state, containing such amounts of compounds of sulfur
as to make it impractical to use, without purifying, because of its corrosive
effect on piping and equipment.
Gas, Sweet Gas found in its natural state, containing such small amounts of compounds of
sulfur that it can be used without purifying, with no deleterious effect on piping
and equipment.
Gas, Unconventional Gas that can not be economically produced using current technology.
Gas, Wet Wet natural gas is unprocessed natural gas or partially processed natural gas
produced from strata containing condensable hydrocarbons. The term is
subject to varying legal definitions as specified by certain state statutes.