FIELD: oil and gas industry.
SUBSTANCE: hydrocarbon gas 1 is compressed at the first stage 2 with cooling down the liquid hydrocarbons released during gas compression by the external refrigerant upon the conditions of partial condensation, obtaining the condensed fluid 4 and the pressure gas 5 which is compressed at the second stage 6 with cooling down the liquid hydrocarbons released during gas compression by the external refrigerant (is not depicted) and by the gas of low-temperature separation, which then is extracted as the pretreated gas 7, obtaining the condensed fluid 8 and the pressure gas 9, which is reduced by means of the device 10 and divided into the pretreated gas 7 and the condensed fluid 12, which is reduced by means of the device 13 and deethanizated in the separating machine 16 jointly with the reduced in the devices 14 and 15 condensed fluids 4 and 8 of the first and the second stages 2 and 6 with obtaining the sales condensate 17 and the deethanizated gas 3, which is recycled to the first stage 2 of the compression. If necessary the purification from the hydrogen disulfide and the gas mercaptan is performed before one of the stages of compression, and/or gas dewatering in block 18 is made.
EFFECT: improving the quality of the condensed fluid and the pretreated gas.
2 cl, 1 dwg
