METHOD OF HYDROCARBON GAS TREATMENT FOR TRANSPORTATION Russian patent published in 2017 - IPC F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: method of treating condensate-containing formation gas for transportation in a basic plant by a three-stage separation involves feeding the gas flow to the primary separation stage, compressing the gas flow and cooling it down with ambient air, cooling the gas flow down. The gas flow is fed to the secondary separation stage, secondary gas flow cooling stage, the stage of gas flow decompression and cooling, then to the final separation stage. The separation gas is heated up by the gas flow after the secondary separation, both decompressed and cooled, then heated up by the gas flow after the primary separation. The separation gas is withdrawn from the basic plant, the liquid phase is fed after the final separation to separate the gas into degassing gas, unstable condensate and a water-methanol solution. The degassing gas is fed to the gas flow after the decompression with cooling, the liquid phase is mixed after the secondary and final separation, the mixed liquid phase is separated into a low pressure degassing gas, unstable condensate and a water-methanol solution. The unstable condensate is mixed and supplied for separation into weathering gas, unstable condensate and a water-methanol solution. The unstable condensate and water-methanol solution are discharged from the basic plant. The low-pressure degassing gas, weathering gas and deethanization gas from the condensate deethanization unplant are mixed, the mixed gas is injected into the gas flow, the deethanization gas is cooled down with the unstable condensate, transported from other gas treatment plants, and with the unstable condensate of the basic gas treatment plant.

EFFECT: increase in the efficiency of the low-temperature separation plant by preventing the reduction of the unstable condensate output by the joint treatment of a gas condensate mixture of wells in the basic plant and gas from the condensate deethanization plant.

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