Method and device for contrasting carbon dioxide-foam flooding displacement stage

Abstract

Disclosed is a method and device for a contrasting carbon dioxide-foam flooding displacement stage. The method for the contrasting carbon dioxide-foam flooding displacement stage is characterized in that based on an actual mine situation to be simulated, the cut-off time node of water flooding of a laboratory experiment is determined according to the water flooding recovery efficiency factor of amine field before performing carbon dioxide-foam flooding, namely, the degree of reserve recovery during a water flooding stage; when a carbon dioxide-foam flooding contrasting experimental scheme iscarried out, the error range of the degree of reserve recovery in the water flooding stage needs to be controlled within + / - 0.01%, so that the remaining oil saturation before the start of the carbondioxide-foam flooding stage is remained consistent on the basis of water flooding in a laboratory; and then, carbon dioxide-foam flooding contrast experiments are carried out, according to the increased range of the degree of reserve recovery of the carbon dioxide-foam flooding stages in all contrast experiments, carbon dioxide-foam flooding parameters or an optimal carbon dioxide-foam flooding scheme are optimized to achieve effective contrast.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method and a device for accurately comparing the displacement stages of carbon dioxide-foam flooding in the enhanced oil recovery technology. Background technique [0002] In low-permeability and ultra-low-permeability reservoirs, carbon dioxide-foam flooding has a better oil displacement effect because it can effectively overcome the problem of easy fingering caused by single injection of carbon dioxide. CO2-foam flooding can increase the pressure difference between injection and production when applied in the field, effectively block the channel of gas channeling, and greatly adjust the suction profile. Considering the economic benefit when applying carbon dioxide foam flooding in the mine field, the slug optimization should be carried out indoors first, and then the field test should be carried out. Therefore, whether the indoor experimental data is ...

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Problems solved by technology

[0004] If the above conventional experimental method is followed, the remaining oil saturation of each physical model after water flooding will be very different. If the carbon dioxide-foam is continuously injected into the physical model, the degree of staged recovery obtained between the various schemes will increase. poor contrast, lack of scientific

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