Carbon dioxide separation and recovery system for oilfield carbon dioxide flooding produced gas

Abstract

The invention provides an oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system. The oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system comprises an oil gas separating tower, a first compressor, a cooler, a condensation filter, a heat exchanger, an activated carbon adsorption bed, a particle filter, a heater, a second compressor and a membrane separation device. According to the oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system, on basis of arrangement of the oil gas separating tower, the first compressor, the cooler, the condensation filter, the heater exchanger, the activated carbon adsorption bed, the particle filter, the heater, the second compressor and the membrane separation device, carbon dioxide gas coarse-fine separation from high carbon dioxide concentration extraction gas can be achieved, and the system is suitable for single well extraction gas carbon dioxide separation and applied to separating recovery of carbon dioxide in oil field small and medium-scale extraction gas.

Description

technical field [0001] The invention relates to the field of carbon dioxide separation and recovery, in particular to a carbon dioxide separation and recovery system for oilfield carbon dioxide flooding produced gas. Background technique [0002] With the large-scale popularization of carbon dioxide flooding tertiary oil recovery technology, the surface technology of carbon dioxide flooding production fluid faces some difficulties: First, after the carbon dioxide is injected into the ground, about 50% to 60% of it is permanently sealed underground, and the remaining 40% to 50% is overflowed with oilfield associated gas. Due to the high content of CO 2 , the gas produced by carbon dioxide flooding cannot enter the gathering pipeline network or be ignited without necessary treatment, and can only be discharged directly, which not only pollutes the environment, but also wastes natural gas and CO 2 resources, reducing the effect of CO2 flooding and sequestration; secondly, bec...

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Problems solved by technology

[0005] According to the characteristics of on-site produced gas, CO 2 The content is relatively high, and the chemical absorption method cannot achieve a high concentration of produced gas CO 2 Separation; the gas flow rate of the produced gas of a single well is relatively low, so the treatment scale is small, the process equipment of the pressure swing adsorption method is complicated, and the supporting process and control equipment are cumbersome, so it is not suitable for small-scale produced gas treatment; at the same time, the low temperature fractionation method also has process equipment Complicated shortcomings, not suitable for small-scale produced gas treatment

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