METHOD FOR PREPARATION OF HYDROCARBON GAS FOR TRANSPORT Russian patent published in 2021 - IPC B01D19/00 B01D53/00 

FIELD: gas industry.

SUBSTANCE: method for preparing hydrocarbon gas for transport is proposed, including the supply of hydrocarbon gas from well bushes to the primary gas separation, the introduction of methanol into the gas stream after the primary separation, cooling by the prepared gas stream, conducting intermediate separation of the gas stream, subsequent cooling of the gas stream by pressure drop, conducting final separation, subsequent heating of the gas stream by reservoir gas and withdrawal from the gas and condensate preparation unit for transport, separation of the liquid at the primary separation, separation of the liquid into a low-concentration mixture of reservoir water and methanol, unstable hydrocarbon condensate and degassing gas, separation of the hydrocarbon gas flow from the hydrocarbon liquid flow at the intermediate separation, separation of light hydrocarbon condensate at the final separation stage, introduction of hydrocarbon condensate after intermediate separation and light hydrocarbon condensate after final separation into the unstable hydrocarbon condensate flow after three-phase separation, separation of the mixed flow of unstable hydrocarbon condensate into weathering gas and unstable hydrocarbon condensate, introduction of degassing gas after three-phase separation into the gas stream after adiabatic expansion and cooling for further final separation, introduction of weathering gas to the ejector as a passive gas, heating of the flow of unstable hydrocarbon condensate after weathering by a stable condensate stream, separation into degassing gas, degassed unstable condensate and water-methanol solution, heating of the flow of degassed unstable condensate with a flow of stable condensate, stabilization in a distillation column, cooling in two stages with flows of unstable condensate of the flow of stable condensate and withdrawal from the hydrocarbon gas and condensate treatment installation, cooling of the stabilization gas flow with an air flow, separation of the stabilization gas flow into light stabilization gases and condensed broad fractions of light hydrocarbons, withdrawal of the flow of wide fractions of light hydrocarbons from the hydrocarbon gas and condensate treatment plant, introduction of a stream of a low-concentration mixture of methanol and reservoir water after three-phase separation of a hydrocarbon liquid into a stream of a water-methanol solution after three-phase separation of an unstable hydrocarbon condensate, heating of a stream of a water-methanol solution with a stream of methanol water, rectification of a water-methanol solution into methanol and methanol water, cooling of a methanol stream with air, condensation and re-introduction into a gas stream as an inhibitor of hydrate formation, withdrawal of methanol water after rectification, cooling of the flow of a low-concentrated solution of reservoir water and methanol, withdrawal of a part of the flow of a low-concentrated solution of reservoir water and methanol from the gas and condensate treatment unit, increasing the pressure of another part of the methanol water flow, introducing a methanol water flow into the flow of unstable hydrocarbon condensate, extraction of methanol from unstable condensate, where the pressure of the stabilization gas flow is increased by compression, separation by membrane gas separation into methanol-saturated permeate and prepared stabilization gas, cooling of the prepared stabilization gas by air flow, introduction of the prepared commercial gas into the flow and withdrawal from the installation, cooling of the methanol-saturated permeate by the flow of the prepared natural gas, separation into light weathering hydrocarbon gases and saturated methanol solution, pressure increase by compressing light weathering hydrocarbon gas and introduction of unstable hydrocarbon condensate into the flow, introduction of saturated methanol solution into the water-methanol solution stream for subsequent rectification.

EFFECT: reduction in the consumption of a hydrate formation inhibitor during the preparation of hydrocarbon gas for transport.

1 cl, 1 dwg, 1 tbl