THREE COLUMN HYDROCARBON RECOVERY FROM CARBON DIOXIDE ENHANCED OIL RECOVERY STREAMS

摘要

A method for recovering hydrocarbons with only three multistage columns includes receiving a carbon dioxide recycle stream. The carbon dioxide recycle stream is separated in a first multistage column to produce a purified carbon dioxide recycle stream and a light hydrocarbon stream. The light hydrocarbon stream is separated in a second multistage column to produce a second purified carbon dioxide recycle stream and a natural gas liquids stream. The natural gas liquids stream is separated in a third multistage column to produce a C3 hydrocarbon product stream and a C4-C8 hydrocarbon product stream. The first multistage column, the second multistage column, and the third multistage column are the only three multistage columns used in the method.