Microwave-assisted supercritical CO2 extraction system and microwave-assisted supercritical CO2 extraction method for crude oil in oil sand

Abstract

The invention discloses a microwave-assisted supercritical CO2 extraction system and a microwave-assisted supercritical CO2 extraction method for crude oil in oil sand. The system comprises at least two extraction kettles, a microwave generator, a separator, a gas purifier, a buffer tank, an entrainer storage tank and the like. The method comprises the following steps: conveying oil sand to each extraction kettle by virtue of a conveying device, meanwhile, feeding CO2 and the entrainer into the buffer tank, enabling the mixture in the buffer tank to enter the extraction kettle, and closing valves at the inlet and outlet ends of the extraction kettle; starting the microwave generator, staying for a period of time after the temperature in the kettle is up to the extraction temperature, opening the valve at the bottom of the kettle, discharging sand, opening the valve at the top outlet of the kettle, and enabling gas-phase fluid to enter the separator through a throttle valve; discharging crude oil from an outlet at the bottom of the separator, and returning the top gas to the buffer tank by virtue of the purifier. The system is provided with the at least two extraction kettles which can be alternately operated to realize continuous operation.

Description

Technical field

[0001] The invention relates to an oil sand separation technology, in particular to a supercritical CO 2 System and method for extracting crude oil from oil sands. Background technique

[0002] With the continuous increase in global oil demand, conventional oil resources can no longer meet the rapid growth of oil demand, and people have begun to turn their attention to unconventional oil resources. As the main source of unconventional petroleum resources, oil sands play a pivotal role in the world's energy supply. According to the research of the United States Geological Survey, the recoverable resources of oil sands in the world are about 103.51×10 9 m 3 , Accounting for about 32% of the world's total recoverable oil resources. At present, research and development of oil sands are accelerating all over the world. With the improvement of exploration and development technologies, their share of global hydrocarbon energy will continue to increase.

[0003] Oil sand ...

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