METHOD OF LOW-TEMPERATURE PREPARATION OF LOW-PRESSURE OIL GAS AT FIELD Russian patent published in 2017 - IPC F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes introducing hydrate formation inhibitor into gas flow, cooling said gas by prepared gas cold recuperation and evaporation of coolant, separating cooled gas from condensed liquid phase, and supplying condensed hydrocarbons and prepared gas to consumer. The required degree of gas preparation is determined by dew point temperature which is the temperature of its cooling, the pressure of prepared gas is calculated from 0.04 to 0.45 Mpa by power dependence and the corresponding pressure of its flow is set. Gas is cooled and inhibited by cooling agent-ammonia to the dew point temperature. For this purpose, coolant is fed directly into gas flow to be prepared and evaporated therein. From the liquid phase condensed in cooled gas, the used coolant-aqueous-ammonia solution is recovered and pumped, thereby coolant pressure is reduced before it is supplied for evaporation. Then ammonia and water which is used for the technological needs of the field are desorbed from coolant.

EFFECT: increased gas preparation efficiency.

5 cl, 3 dwg