E

Edge water

A layer of water right above, below or around an oil/gas reservoir. 
 

Elastomer

An elastic, synthetic rubber or plastic material, which often is the main element in the packer material used in down hole packers. 
 

Emulsifier

A material that causes water and oil to form an emulsion. 
 

Emulsion

A mixture of two fluids that is not soluble in each other. For instance oil and water. 
 

Enhanced oil recovery (EOR)

Refers to a series of different processes that increase the amount of oil from a reservoir. Usually, injecting fluids or gas increases the amount. 
 

Exploration and Production (E&P)

See upstream
 

Exploration drilling

A drilling that is made to explore whether there is hydrocarbons in a certain reservoir. 
 

Exploration license

A licence from the state to look for oil or gas in a certain area.