A method and device capable of increasing the capture rate of carbon dioxide in oilfield carbon dioxide flooding produced gas

Abstract

The invention relates to a method and device for improving the carbon dioxide capture rate in oilfield carbon dioxide flooding produced gas. The method comprises the following steps: raw material gas precooling; CO 2 Cooling; raw material gas flash separation; cryogenic stripping; tower top gas recovery. The device includes: feed gas precooler, CO 2 Cooler, flash tank, stripping tower, tower bottom reboiler, tower top cooler, tower top gas separator, tower top gas compressor, compression outlet cooler; The gas precooler is connected, and the raw gas precooler is connected with the CO 2 cooler connected, the CO 2 The cooler is connected to the flash tank through pipelines, and the flash tank is connected to the stripping tower through pipelines, and the stripping tower is connected to the overhead separator through pipelines, and the overhead separator is connected to the overhead cooler through pipelines. connected. Compared with the current low-temperature rectification process, the present invention mainly develops the tower top gas recovery process, carries out cold recovery and utilization, and realizes CO 2 recycling, reducing venting and improving CO 2 recovery rate.

Description

technical field [0001] The invention relates to the field of carbon dioxide separation and recovery, in particular to a method and device capable of increasing the carbon dioxide capture rate in oilfield carbon dioxide flooding produced gas. Background technique [0002] CO 2 is a typical greenhouse gas, CO 2 Used in oil field flooding can not only enhance oil recovery, but also realize the greenhouse gas CO 2 The permanent storage not only improves the economic benefits, but also produces a wide range of social benefits. But using CO in the oil field 2 During oil flooding, part of the CO 2 It will be extracted with the oil and gas production process, resulting in a large amount of CO contained in the produced gas 2 , the part CO 2 It needs to be captured and recycled, otherwise it will affect the storage effect and reduce CO 2 Drive environmental benefits. Cryogenic distillation process is to capture CO 2 Flooding high concentration CO in produced gas 2 A common p...

AI Technical Summary

Problems solved by technology

But using CO in the oil field 2 During oil flooding, part of the CO 2 It will be extracted with the oil and gas production process, resulting in a large amount of CO contained in the produced gas 2 , the part CO 2 It needs to be captured and recycled, otherwise it will affect the storage effect and reduce CO 2 Drive environmental benefits

Cryogenic distillation process is to capture CO 2 Flooding high concentration CO in produced gas 2 A common process that can produce more than 96% high-purity CO 2 Liquid products; but the process also has low capture yield, CO 2 The disadvantages of high venting ratio and high unit capture energy consumption reduce oilfield CO 2 Benefits of flooding

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