METHOD FOR PREPARING GAS IN OIL AND GAS FIELDS Russian patent published in 2017 - IPC F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: method involves purification from hydrogen sulphide and carbon dioxide, separation from dropping liquid, introducing inhibitor of hydrate formation into stream of prepared gas, separation of condensed hydrocarbons from cooled gas and used inhibitor, regeneration of main inhibitor component, supply of prepared gas and condensed hydrocarbons after their cold recuperation to consumer. Solution of ammonia and gas is used as inhibitor of hydrate formation, gas is cooled in evaporator with coolant-ammonia regenerated by desorption from mixture of used inhibitor and solution, obtained in the process of absorption from desorption water and ammonia after evaporator, the mixture for desorption is supplied with a pump, the regeneration of the main component of the inhibitor and the cooling agent-ammonia is executed together, recuperation of cold of prepared gas is additionally carried out by withdrawal of heat energy in the process of ammonia absorption by water, excess water after desorption is used for process needs of the field, losses of ammonia with prepared gas are replenished directly by its synthesis from nitrogen and hydrogen at the field or from outside.

EFFECT: increased efficiency.

2 cl, 1 dwg