Gas:

Technically, a gas will not condense when it is compressed and cooled, because a gas can exist only above the critical temperature for its particular composition.

Below the critical temperature, this form of matter is known as a vapor, because liquid can exist and condensation can occur.

Sometimes the terms “gas” and”vapor” are used interchangeably.

The latter, however, should be used for those streams in which condensation can occur and that originate form, or are in equilibrium with, a liquid phase.

Terms Related to Gas

• Reservoir

  A porous and permeable underground formation containing an individual and separate natural accumulation of producible hydrocarbons (oil and/or gas) which is confined by impermeable rock ...

• Distillation

  The process of driving off gas or vapor from liquids or solids, usually by heating, and condensing the vapor back to liquid to purify, fractionate, ...

• Natural gas

  A mixture of hydrocarbons and varying quantities of nonhydrocarbons that exist either in the gaseous phase or in solution with crude oil in natural underground ...

• Wetting agent

  A substance or composition that, when added to a liquid, increases the spreading of the liquid on a surface or the penetration of the liquid ...

• Free water

  1. Water produced with oil. It usually settles out within five minutes when the well fluids become stationary in a settling space within a vessel. ...

• Viscosity

  A measure of the resistance of a fluid to flow. Resistance is brought about by the internal friction resulting from the combined effects of cohesion ...

• Emulsion

  A mixture in which one liquid, termed the dispersed phase, is uniformly distributed (usually as minute globules) in another liquid, called the continuous phase or ...