METHOD OF COLLECTING AND RECYCLING LOW PRESSURE GAS IN FIELD PREPARATION OF NATURAL GAS WITH LOW CONDENSATE FACTOR Russian patent published in 2017 - IPC E21B43/00 F04F5/54 F25J3/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry. Method of collecting and recycling low-pressure gases in field preparation of natural gas comprises feeding condensate-containing gas to a low-temperature separation (NTS) apparatus for degassing. Low-concentration water-methanol solution is discharged into a first degasser and then into industrial effluents. High-concentration water-methanol solution is discharged into a second degasser and then for recirculation into NTS apparatus. Unstable condensate is fed into condensate stabilisation apparatus (USK), where it passes through a first weathering unit, second weathering unit and end separation unit (KSU). Stabilisation is carried out by stepwise reduction of pressure. In weathering units condensate heating is performed. Low-pressure gases from degassers, weathering units and KSU are reduced to lowest working pressure among said apparatus and are together directed to a low-pressure collector and then as a passive stream into ejector. Commercial gas after NTS is fed into ejector. Ejector output stream is fed for own process needs.

EFFECT: reduced process losses of hydrocarbons, as well as improved environmental properties.

1 cl, 1 dwg