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The oilfield associated gas recovery device is designed in this paper according to the status of associated gas recovery in oilfield. The operational principle and working flow sheet of associated gas recovery device are expounded. Meanwhile, the relation of gas temperature and pressure in the device during the heating process is analyzed and calculated through the ideal-gas equation. The gas recovery device designed above is theoretically proved to be feasible. The oilfield associated gas can be effectively recovered by the device which has low investment and convenient field application.