To efficiently separate an oil and water while recovering thermal energy by a relatively simple step.
The high-temperature high-pressure water containing the oil comprising a heavy oil, a middle distillate, a light oil and a gas is firstly reduced to a predetermined temperature and pressure by a first separation means 11. Thereby, the heavy oil is retained in a liquid phase state with a part of the high-temperature high-pressure water, and the middle distillate, the light oil and the gas are made to be in a vapor phase state with a remained part of the high-temperature high-pressure water, and separated. Then, the heavy oil with the part of the high-temperature high-pressure water, separated by the first separation means 11, is reduced to a predetermined temperature and pressure by a second separation means 12. Thereby, the heavy oil is retained in a liquid phase state and the high-temperature high-pressure water is made to be in a vapor phase state, and separated. Further, the middle distillate, the light oil and the gas with the remained part of the high-temperature high-pressure water, separated by the first separation means 11, are reduced to a predetermined temperature and pressure by a third separation means 13. Thereby, the gas is retained in a vapor phase state and the middle distillate, the light oil and the high-temperature high-pressure water are made to be in a liquid phase state, and separated.
SAIKI WATARU
MIYASHITA YASUSUKE
KAWASAKI HAJIME
PETROLEUM ENERGY CENTER FOUND
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