FIELD: oil and gas industry.
SUBSTANCE: group of inventions relates to methods for field preparation of hydrocarbon gases and can be used in oil industry for processing associated petroleum gas. Proposed are four versions of installation, which includes two compressor stations, recuperative heat exchanger, two separators, three-phase separator, gas drying and / or cleaning unit, dephlegmator with external cold source, as well as reducing devices. In versions 3 and 4, the upper part of the dephlegmator is equipped with a heat-mass exchange section. In operation of first installation variant, associated oil gas of first separation stages is mixed with stabilization gas, compressed in first compressor stage, mixed with separation gas from three-phase separator, cooled in heat exchanger and separated in first separator into residue and gas, which is dried and / or cleaned and supplied to the bottom of the dephlegmator, the upper end of which is cooled with a cooling agent supplied from the cold source. Reflux gas is withdrawn from the top of the dephlegmator, heated in a heat exchanger and discharged as a dry stripped gas, and reflux is discharged from the bottom of the dephlegmator. Associated oil gas of end separation plant is compressed in second compressor and separated in second separator into gas and residue. Separation residue and reflux are reduced, mixed and directed to three-phase separator, from which water condensate, WSLH and stabilization gas are removed. Operation of the second and fourth versions of the plant are characterized by recuperative cooling in the heat exchanger of separation gas after the drying and / or cleaning unit. Operation of the third and fourth versions of the plant is characterized by additional recuperative cooling of the refluxer top part by means of a heat-mass exchange section.
EFFECT: group of inventions provides reduced metal consumption and reduced power consumption.
4 cl, 4 dwg
