METHOD OF HYDROCARBON GAS PREPARATION FOR TRANSPORTATION Russian patent published in 2015 - IPC F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: method of hydrocarbon gas preparation for transportation includes the following stages. Formation gas is delivered to a separator of the first stage. Gas separated in the separator of the first stage is compressed and cooled down. Then gas separated in the separator of the first stage is delivered through heat exchanger of the first cooling stage to the separator of the second stage. Then gas separated in the separator of the second stage is delivered through heat exchanger of the second cooling stage and reducer to the separator of the third stage. Liquid from the separator of the second stage is delivered to the separator of the third stage. Gas from the separator of the third stage is delivered to reducer thus ensuring additional cold production. Then gas from the reducer is delivered to the heat-exchanger of the second cooling stage thus ensuring additional cold recovery. Gas is sent from the heat-exchanger of the second cooling stage to the reducer. Then gas is delivered from the reducer to the heat-exchanger of the first cooling stage and further this gas is outputted from the plant.

EFFECT: improved energy efficiency of gas preparation with multi-stage low-temperature gas separation.

1 dwg, 1 tbl