Oil field associated gas decarburization system

The invention discloses an oilfield associated gas decarburization system and belongs to the technical field of associated gas treatment.The oilfield associated gas decarburization system conducts decarburization treatment on associated gas by arranging three stages of membrane assemblies, each stage of membrane assembly is internally provided with a CA membrane with the CO2/CH4 separation factor being 20, the three stages of membrane assemblies are integrally provided with a circulation system, and the decarburization efficiency of the associated gas is greatly improved. The auxiliary decarburization system is arranged and comprises the compressor, the supercharger and the air cooler, meanwhile, the multi-stage activated carbon buffer tanks are arranged to achieve the effects of stability maintaining, buffering and filtering, the characteristic that the first activated carbon buffer tank is large in volume is utilized, the high-pressure associated gas is buffered, it is guaranteed that the associated gas sta