Press center



mixture of light hydrocarbons in a liquid state.


interrelation of light products (gases, petrol and gas oils) and residue, in relation to entry raw material, expressed in percentages. Conversion depends on the type of raw material, pressure, temperature and spatial velocity. Conversion also means transforming one product into another.


chemical reaction of cracking big organic molecules and making small molecules under the effect of higher temperature. By cracking molecules of kerogen, bitumen and petroleum are produced, and by cracking oil, condensate and gas are produced.

Chemical compound

matters consisting of identical molecules made of atoms of several elements; matter consisting of more elements.


simultaneous production of electrical power using gas and steam turbines.


perforated (porous) and<strong> </strong>permeable rock (deposit, layer) where fluids and gases can accumulate; when vaulted by impermeable rocks, can be a reservoir of petroleum and natural gas.

Compressor station

(CS), facility for compressing natural gas to a higher pressure, consists of necessary number of compressors with engines running on gas or electricity.


transformation of vapours into liquid state by cooling.


chemical compounds that expedite chemical reactions but do not participate in these reactions.


the term ‘natural tar’ is sometimes used for heavy petroleum (bitumen) that has penetrated to the surface of the Earth; heavy residues discharged from gases during gasification of coal and wood, feedstock for chemical industry; deposits in chimneys where furnaces are fed with coal or wood.

Wheel grease

grease for oiling axles of horse-drawn and other vehicles; in the past, a product of simple refining of heavy petroleum from natural sources.