PROCESS OF LOW-TEMPERATURE SEPARATION OF OIL-FIELD GAS Russian patent published in 2000 - IPC

FIELD: oil and gas production. SUBSTANCE: process includes initial separation of dropping liquid in high-temperature separator followed by cooling of part of gas in heat exchanger, then in subsonic duct of energy-separation device in the form of shell-and-tube heat exchanger in separate supersonic and subsonic duct gas inlets. Another part of gas from high- temperature separator is passed through supersonic ducts of energy- separation device, where gas is sped up to 1.5-3.0 Mach, cooled in another heat exchanger connected to mean-temperature separator and mixed with gas cooled in restrictor and withdrawn from low-temperature separator. Mixture is then separated into liquid and gas fractions in mean- temperature separator. Cooling of gas in heat exchangers is effected by gas withdrawn from mean-temperature separator, and ratio of total initial pressure in supersonic ducts to total supersonic ducts' outlet pressure ranges between 1.3 and 1.9. EFFECT: reduced temperature of gas being treated and thereby increased yield of condensate at the same pressure gradient. 2 dwg