Patent ID: 7644756

Claim:
An apparatus for oil recovery by injection of steam, carbon dioxide and nitrogen, comprising: a steam pressure regulator; a steam thermometer; a steam pressure gauge; a steam flowmeter; a carbon dioxide pressure regulator; a carbon dioxide compressor; a carbon dioxide thermometer; a carbon dioxide pressure gauge; a nitrogen compressor; a nitrogen pressure regulator; a. nitrogen thermometer; a nitrogen pressure gauge; assembled valves; a gas injection tube; and a chemical agent valve; the steam pressure regulator, the steam thermometer, the steam pressure gauge and the steam flowmeter being connected in sequence in a steam system; the carbon dioxide compressor, the carbon dioxide pressure regulator, the carbon dioxide thermometer and the carbon dioxide pressure gauge being connected in sequence in a carbon dioxide system; the nitrogen compressor, the nitrogen pressure regulator, the nitrogen thermometer and the nitrogen pressure gauge being connected in sequence in a nitrogen system; and the steam system, the carbon dioxide system, and the nitrogen system being connected into a heavy oil well via assembled valves, the gas injection tube and a down-hole tube.