FIELD: oil and gas industry.
SUBSTANCE: associated petroleum gas 1 jointly with the gas of separation 2 and the deethanizated gas 3 is compressed at the first stage 4 with cooling down the liquid hydrocarbons released during gas compression by the external refrigerant upon the conditions of partial condensation and stabilizing of the reflux liquid, obtaining the condensed fluid of the first stage 5 and the pressure gas 6, which is compressed at the second stage 7 with cooling down the liquid hydrocarbons released during gas compression by the external refrigerant and by the pretreated gas 8, which is then extracted, obtaining the condensed fluid of the second stage 9 and the pressure gas 10, which is reduced by means of the device 11 and divided in the separating machine 12 into the pretreated gas 8 and the residual part 13, which after the reducing by means of the device 14 is deethanizated in the fractionation column 15 with obtaining the propane-butane fraction 16 and the deethanizated gas 3. The condensed fluid of the first stage 5 is reduced by means of the device 17 and separated in the separating machine 19 jointly with the reduced by the device 18 condensed fluid of the second stage 9 with obtaining the sales condensate 20 and the gas of separation 2. If necessary the purification from the hydrogen disulfide and the gas mercaptan is performed before one of the stages of compression 4, 7, and/or gas dewatering in block 21 is made.
EFFECT: improving the quality of the pretreated gas and the condensed fluid, product differentiation.
2 cl, 1 dwg
